Canon EF-S 15-85mm f/3.5-5.6 IS USM All-Purpose Zoom Lens
Canon’s serious entry for a consumer-grade kit lens (18-55mm) replacement for their DSLR line first started with the EF-S 17-85mm f/4-5.6 IS USM lens, commonly found as an ‘upgraded’ kit lens for the EOS 50D onwards. Soon after, Canon released three more consumer-grade lenses that are commonly available to be purchased with an EOS crop body. First came the much awaited Canon EF 18-200mm f3.5-5.6 IS all-purpose zoom lens, then the EF-S 18-135mm f/3.5-5.6 IS and the Canon EF-S 15-85mm f/3.5-5.6 IS USM UD Wide Angle Zoom Lens followed with the release of the EOS 7D.
We’ll be looking at the Canon EF-S 15-85mm lens today and see how it stands on its own merit, as well as finding out if it’s worth the upgrade from the standard 18-55 kit lens and as a replacement for the other Canon all-purpose zoom lenses such as the 17-85mm, 18-135mm, and 18-200mm mentioned earlier.
Technical Specs
From Canon:
The new EF-S 15-85mm f/3.5-5.6 IS USM sets a new standard for everyday photography on APS-C sensors. With a focal length range equivalent to 24-136mm in 35mm format, image stabilization and high-precision optics, the EF-S 15-85mm f/3.5-5.6 IS USM offers stellar performance from wide-angle through to telephoto.
Focal Length & Maximum Aperture 15 – 85mm 1:3.5-5.6
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Lens Construction 17 elements in 12 groups
Diagonal Angle of View 84° 30′ – 18° 25′
Focus Adjustment Inner focusing system with USM
Closest Focusing Distance 1.15 ft./0.35m
Filter Size 72mm
Max. Diameter x Length, Weight 3.2 x 3.4 in./81.6 x 87.5mm, 20.3 oz./575g
Physical Observations
The EF-S 15-85mm is a crop-sensor-only camera lens. It will work on all Canon DSLRs other than the EOS D30, D60, 10D, and the non-APS-C cameras such as the 5D (MK1 and II) and all 1D series cameras.
With the APS-C sensor’s crop factor of 1.6x, the EF-S 15-85mm will provide the view of 24-136mm on a 35mm (full-frame) format. Needless to say, this is a highly useful focal range to work with and no other current Canon lens line-up has this range. The closest would be the old EF 28-135mm f/3.5-5.6 IS USM and the popular EF 24-105mm f/4L IS USM lenses, both of which have significant wide-angle disadvantages on a crop-sensor camera due to its 38mm equivalent wide-end coverage.
Size and Weight
The EF-S 15-85mm looks and feels very much like the EF-S 17-85mm lens, handling is quite similar but the former is 100g heavier.
The length and weight feels OK on a mid-sized EOS xxD body, if not a little heavy on a Rebel. Then again, most lenses will feel heavy on a small Rebel.
Handling is good and tactile, with the wide zoom ring and good weight balance. However, the manual-focusing ring is quite narrow and it takes a while to get used to locate the ring without looking at the lens itself.
The front element does not rotate as the lens utilizes an internal focusing system, making it easier for filter use.
The lens uses an uncommon 72mm filter size. I wish it used a more standard 77mm though.
A lens hood is NOT provided, as with all other non-L lenses, this practice of not including a hood by Canon is getting more ridiculous with lenses over $500, in my opinion. In any case, the EW-78E lens hood is available for this lens.
Focal Range
As mentioned, the EF-S 15-85mm covers roughly the same field-of-view as a 24-136mm lens on a 35mm full-frame camera, which makes it the widest all-purpose zoom lens that Canon has to offer right now (the EF-S 10-22mm isn’t exactly all-purpose, neither is the newly released EF 8-15mm pro-grade fish-eye lens) and it naturally appeals to users who are looking for a single-lens solution for a wide-range of photographic subjects from landscape to tight portraits.
15mm Sample
85mm Sample
The EF-S 15-85mm doesn’t have the reach of the EF-S 18-135 nor the EF-S 18-200, however, it does offer more useful wide angle coverage. A focal length increase at the telephoto end is often less useful than an increase in field-of-view offered by a wider lens, particularly on consumer, small-aperture lenses.
Having the option of taking wide environmental portraits or zooming in close is always a nice dilemma to have.
The EF-S 15-85mm is a variable aperture lens. It sports an f/3.5 maximum aperture at 15mm and a maximum aperture of f/5.6 at 85mm. Specifically, the maximum aperture changes at the following focal lengths:
- 15mm – f3.5
- 17mm – f4
- 28mm – f4.5
- 35mm – f5
- 60mm – f5.6
Build Quality
The build is decent and doesn’t exhibit any discernible wobble unlike the EF-S 18-55mm kit lenses. The zoom ring is nice and tight (but has issues about zoom creep, see below), while the switches for the image stabilization and auto-focus options feel very much like the pro-grade EF 24-105mm f/4L IS USM. The lens mount is made of metal as well.
Focus
The famous Canon Ultrasonic Motor (USM) allows fast and near-silent focusing throughout its focusing range. You can cycle through the entire focusing range in less than a second. AF tracking is quite accurate and Single-Shot AF locking is instantaneous. Low-light focusing is above average as well as long as enough contrast is present, particularly at longer focal lengths.
Image Stabilization
The redesigned image stabilization (IS) mechanism boasts a 4-stop hand-holdability according to Canon. While the new IS system seem to be less ‘jumpy’ on the viewfinder compared to the older systems, real-world hand-holdability is more like a 2.4-3 stop advantage rather than a 4-stop claim. The internal tripod-sensing system seems to easily confused as well as there are cases where the IS system doesn’t start until it detects a more significant lens movement. It’s definitely not as impressive as the EF 100mm f/2.8L IS USM‘s HIS system.
The images below were shot at 85mm focal length, shutter priority, center AF point, hand-held (no bracing or support).
While the samples above do show good image stabilization assistance, the ratio between blurry and sharp images was quite high at the 4-stop point.
At 1/10, the edge sharpness of the number “5″ is much blurrier than the 1/25. However, you can clearly see the advantage of having the IS mechanism for the lens.
0.3 sec, f/4.5, ISO 640. Hand-held
1/8 sec, f/3.5, ISO 1000. Hand-held
0.4 sec, f/5, ISO 1250. Hand-held
Results may vary as there are many ways to stabilize a hand-held camera further and the photographer’s ability to steady the camera. I do have shaky hands by the way.
Lens Creep
One of the more common annoyances for all-purpose zoom lenses that doesn’t have internal zoom mechanisms is the “lens creep” or “zoom creep” phenomenon, wherein the lens’ barrel extends or collapses when the lens is held at certain incline or decline angle.
The popular Nikon 18-200mm lens made this phenomenon well-known in the market and they have subsequently added a physical lock to stop the creep. However, most other lenses still have the same problem, including Canon’s own 18-200mm lens.
The main issue with lens creep is when the lens is facing downwards (like when the camera is hung around your neck or when you’re shooting downwards), the lens will not hold its zoom position and gradually extends on its own. The same issue applies when you’re shooting upwards, where the lens will collapse its length if the zoom mechanism isn’t held in place.
You’ll then be forced to hold the zoom ring at that exact zoom position in order to prevent the focal length from changing.
The EF-S 15-85mm lens creep is rather unusual. While the lens isn’t equipped with a lock, when the lens at its widest focal length (15mm), the lens will not extend whatsoever even if pointed downwards. At the other extreme, the lens will also not collapse when you’re shooting upwards while zoomed out to 85mm either. That’s a good thing!
However, when you leave the lens at 20mm and you aim the lens downwards, it will creep up to about 55mm rather quickly. Naturally, if you’re at around 55mm, the lens collapses to about 20mm as well when you point the camera upwards.
You can really feel the zoom ring loosen significantly as you reach the 20-55mm mark compared to the 15-20mm and 55-85mm range.
Optics Performance
Naturally, a lens’ worth and value is in its ability to reproduce sharp images with minimal flaws and compromises. Given the fact that this lens is trying to cover the difficult wide-angle coverage and extends all the way to a short telephoto, some sacrifices are expected to occur.
With many all-purpose lenses around, optics are usually compromised significantly in the name of convenience and versatility. The greater the discrepancy of field-of-view, the higher the compromise in many cases.
Sharpness
I’m glad to announce that in terms of detail rendering and sharpness, the EF-S 15-85mm is top-notch in its class regardless of aperture setting.
While most consumer zooms are mediocre, at best, at their wide apertures, the EF-S 15-85′s center sharpness is excellent throughout its focal range even at its widest apertures. This is even more evident at the 15mm range as the previous EF-S 17-85mm is awful at its widest focal length and max aperture.
Even the corner details are commendable. Despite the natural distortion of a wide angle lens, the edges are very respectable in sharpness and the details are held well on an A4 print.
For an all-purpose zoom lens, this is a big, but pleasant surprise. Narrowing the aperture down a stop or two will improve sharpness and resolution even more, but I’m confident to say that most folks will find it sharp enough wide-open. Diffraction is evident at around f/13, but I doubt many will shoot at this aperture except landscape enthusiasts.
Chromatic Aberrations
For a lens with 17 elements, CA is quite evident at 15mm and 85mm, though definitely not as bad as the EF-S 18-55mm (both IS and non-IS), EF-S 17-85mm, and EF-S 18-135mm. Between 20-70mm, however, the CA is well controlled for a zoom lens. If you’re shooting RAW, it’s quite simple and predictable to correct the color aberration, so if you’re a JPEG shooter, be more careful when shooting against high-contrast, hard-edge scenes.
Contrast / Color
Contrast is pretty neutral, not as punchy as the L-lenses or the top-of-the-line EF-S lens, the 17-55mm f/2.8, but the straight-off-the-cam images are pretty predictable and the colors are a bit on the warm side.
Distortion
As expected, any lens wider than 18mm will have significant barrel distortion, and the EF-S 15-85mm is no exception. However, this isn’t a unique flaw to the lens and even more expensive pro-grade wide angle lenses will exhibit some degree of barrel distortion. The EF-S 15-85mm is a lot better than its stable-mates (EF-S 18-55, 18-135, 18-200, 17-85) in this regard.
Zoom in to 30, 50, 85mm, there is hardly ANY noticeable distortion.
As a matter of fact, the EF-S 15-85mm at 15mm has less barrel distortion than the EF 24-105mm f/4L at 24mm.
Vignetting
Wide angle lenses are susceptible to vignetting (darkening of corners), and wide angle ZOOM lenses are even more prone to it. The EF-S 15-85mm is no exception. At maximum apertures, vignetting is evident at all focal lengths, particularly offending at 15-20mm range. A light loss of close to 2-stops at 15mm at the corners is quite significant, stopping down improves things marginally at this focal length. Vignetting is minimal at 30-50mm and increases slightly to about 1/2-stop at 85mm.
With such levels of vignetting, I’m curious as to how the lens performs if it indeed comes with a standard lens hood.
Flare Control
Zoom lenses are often susceptible to flare when the light source is within the frame, the amount of glass elements inside a zoom lens tends to product complex and multiple flare orbs.
The EF-S 15-85 controls flare very well. In most shooting conditions, flare doesn’t appear in the photos until the light source is angled a certain manner. Chances are a UV filter will be the one introducing the flare, not the lens itself.
15mm, 11AM sun.
With Hoya Pro1D UV Filter
Bokeh
The following shots are taken at the lens’ minimum focusing distance (MFD) at different focal lengths at their widest apertures, I’ll leave it up to you to decide if the bokeh qualities are acceptable to you as this is a purely subjective analysis.
15mm
24mm
35mm
70mm
85mm
For an all-purpose lens, I think the 7-blade aperture produces good enough bokeh although some hard, busy edges are still present in the background. The patterns are nice and smooth though, no ugly pentagonal or hexagonal orbs here.
For portraits, the transition between the sharper areas to the blurry background is quite pleasing and neutral. Certainly a step-up from the standard 18-55mm kit lens.
Subjective Opinion and Verdict
The Canon EF-S 15-85mm f/3.5-5.6 IS USM is a wonderful lens for its intended purpose and target market, which is an all-around travel and daily lens capable of covering a vast array of subjects and scenes. The build quality, optics, and usability makes it a worthwhile upgrade to users who are fed up with the optical and focal length shortcomings of the Canon EF-S 18-55mm kit lens, the sub-par performance of the EF-S 17-85mm kit lens, and those who find the limited use of longer focal lengths and average image quality of the EF-S 18-135mm and the EF-S 18-200mm.
The strengths of the EF-S 15-85mm lies on the important aspect of a lens. Delivering sharp, contrasty, high-resolution images on high-resolution, crop-sensor cameras such as the newer 15-18MP APS-C EOS DSLRs even at wide-open apertures is a rarity.
Having a fast focusing USM system and efficient image stabilization make this lens very usable and capable in most situations.
However, the EF-S 15-85mm is in strange marketing position as it’s sandwiched between the mediocre EF-S 17-85 and the much more versatile 18-135 and 18-200 in terms of focal range, but all three are inferior at larger apertures compared to the 15-85, which should make the EF-S 15-85mm an easy option for buyers.
The biggest issue is the price, however. At the moment, the EF-S 15-85mm at Amazon sells for US$720, while the EF-S 17-85mm and the EF-S 18-135mm both sells for $450, and the EOS 7D + EF 15-85mm kit costs $21xx. With the EOS 7D body costing $1534, that would drop the lens price down to $622, which is about perfect.
The biggest hurdle for the Canon EF-S 15-85mm isn’t its stable-mates from Canon, but from the 3rd-party offerings like Sigma and Tamron as their wide-to-medium (16-50/17-50mm) lenses sport high-quality optics at a constant f/2.8 aperture with image stabilization as well, and they cost around $600 only.
Sample Photos
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About David L. Tong
Hello there! This is such a great review for a lens! Thanks BTW, I have this lens, and it does the job verrrrrry well. Check out my portfolio: http://molybdenum-studios.deviantart.com/
Regards from the Philippines! (:
Thanks for dropping by and for the comment. Nice photos :)
Hi Tony,
I\’d love to help, kindly send me an email at david at davidleetong dot com :)
Dave
David,
I would first like to say that I came across your website by accident and I'm so glad I did!
I have just spent the last 5 nights reading your camera and lens reviews. I am a total novice and have never held owned an slr camera previously – I have been using a canon ixus (fit in your top pocket) for the past few years. I love photography so I want to initially buy a decent camera and lens as I know that I'll get plenty out of it.
I was tossing up between then Canon 60d or 7d, I held the 60d in my hands and I didn't like the feel of the double rotating scrolls on the back, cause I have somewhat big hands and fingers I really couldn't operate the inner scroll from the outer. So I'm now leaning towards the 7d and I will get the 15-85mm lens after reading this review.
I was wondering if you could point me in the right direction, I really want to get into taking photos of landscapes / buildings and night time photos of buildings / lights of Vegas etc. I'm also heading to Vietnam and Cambodia so I was wondering if you could recommend a few other lenses which I should buy!
Thanks so much
Tony williams
HI dave! Nice review! I always read your blog/reviews first before i buy something. This review made my mind that I will now get this lens rather than the 18-200mm. The 17-55 f2.8 lens is pricey for me. Thanks!
Glad to hear that John, between the 15-85 and the 18-200, it\’s not even close, so you\’ll LOVE this lens :)
Hi David
First I want to thank you for the review of this lens. I have purchased this lens and am waiting for it to arrive. I also own a canon 70-200mm f4.0 L usm lens and am very happy for the quality this lens brings into my pictures.
I really thought that the canon 15-85mm would be a good choice because of its optical quality. I am not a professional but just want a good travel lens with decent preferences. I use my lenses on a canon eos 400D and so far I am happy with the results.
However, after having read your review I somehow get in doubt if this lens is a good choice for my camera. I have no intentions to upgrade to a full frame camera, so please let me know if you think I will be happy with this lens.
Regards
No doubt, in my honest opinion, and as stated in my review, I do think this is the best walk-around, everyday lens out there for APS-C Canon cameras in terms of focal range, image quality, price, and size. The image quality is at par with many L zoom lenses.
It may not be the best low-light lens (because of its aperture limitation), but like I mentioned, a flash will always be handy for low-light event shooting.
OK THANKS MR DAVID
PS:SEEK ADVICE AGAIN IN FUTURE, JUST STARTED IN PHOTOGRAPHY
No problem Daniel,
Just drop me a message on FB/Twitter/Email if you need anything :)
thanks alot mr david, cos ask seller said it from jpn but too excited, check it at night is was from taiwan ( from 7D ) but no len creep quiet tight when zoom at 35 to 53/6 mm on vertical, thanks God
The lens will \’loosen up\’ after a while, but that\’s not a defect, practically all zoom lenses with over 3x zoom does that, even the 24-105 does that, so don\’t make a big deal out of it.
Don\’t worry about where things are made especially with mass-produced items like electronics, they\’re made by robots in the first place and pass through the same corporate quality control standards.
hi guys may i know which country made of ur 15-85 is usm
Japan, but honestly, it DOES NOT matter where something is made, that concept is quite dated and haven\’t been valid since the advent of globalization… Even if something is tagged as Made in [insert country], the components come from all over the world. The unwritten \’rule\’ of \’made in xxxx\’ label simple means where the final product was assembled prior to shipping. Open things up and you\’ll see components coming from China, Korea, Japan, South America, etc.
for the 15 85 mm will the hood effect the image ? pls advise
Hoods basically shield your lens from stray light, so it affects the image in a positive way. If you\’re curious if the hood vignettes or not, then the answer is no, it will not negatively affect the image.
Hi Pam, no worries about the weight, all lenses will mount and support fine on any EOS camera, the mount is more than sturdy enough for supporting any lens. This is the perfect lens for an APS-C in my opinion, especially for general purpose use. It's definitely not 'too much' for your camera, Pam. It's not as heavy as the 24-105L, for example, but not that much larger than the old 17-85mm lens either. It's just right.
Dave
p.s. i guess i am asking that since i am using the rebel xs, is this lens too much for the camera? thanks david
hi david,
enjoyed your review – it seems like you are in my head in terms of your perspective and the questions you ask and answer. i''m just getting invested in digital slr photog after a break since shooting film then a point and shoot, partly waiting until the digital innovations reached a stable place. i bought a rebel xs last year, and love the size and weight of it. i have been researching upgrading the kit 18-55mm lens and fell on your review. this seems like the lens for me. given that i am using the xs, want to stay with something on the smaller/lighter size, and that i will want to stay in the APS range in the future likely, is there anything more you can advise? thanks again for your fine review.
Hi and thks for the excellent review..
I'm planning to get the 7D sometime next week and unsure if I shd get the 15-85 kit or get a EF-S17-55mm f/2.8 IS USM separately with the body only. I am thinking might as well spend a little more to hv a better lens. What's ur opinion on this? I have read good reviews on the 17-55 f/2.8
Appreciate ur help!!
Hi Lee.
Tough, tough call… Optics and image quality-wise, the two lenses are THE best EF-S zoom lenses available. The 15-85 is obviously more versatile due to its focal length coverage, but the 17-55 is a better low-light lens. Are you planning to use this more for portraits and low-light (with no flash)? If so, get the 17-55. But if you\’re like me who wants a carry-everyday-shoot-anything lens and carries a flash gun most of the time, the 15-85 is a better choice since I shoot at f/4 most of the time anyway with a flashgun. Can\’t go wrong with either one, but it\’ll highly depend on your preferred subject and shooting conditions.
Thks for the quick reply!
I prefer an all-round lens just like u do… but i do shoot lots of candid people shots indoors without flash.. so am looking at the 17-55.. but I heard that it's not compatible for full-frame bodies should I upgrade in future?
All EF-S lenses aren't compatible with FF cameras. The question is, how soon will you be upgrading to a full-frame camera? I've heard a lot of people dismiss the EF-S line of lenses (particularly the 17-55 since it's the most expensive) because of that question, but in reality, not many will jump to the FF bandwagon soon anyway. If you're not planning to get a FF camera within the next couple of months, are you willing to lose whatever images you can take with the EF-S lens in the meantime?
If FF compatibility is a concern, I'd strongly advice NOT getting the 7D as well if you don't have an existing camera yet and just get the 5DII with 24-105 kit instead, it'll make more sense and save you money in the long run.
Also, re-selling good lenses like the 17-55 2.8 lessens the impact of monetary value loss anyway. You can still get very good resale prices on premium lenses in the used market.
Last comment, somewhat unrelated to the lenses involved. If you like shooting indoor candids, I strongly advice you to get a fast prime (24, 35mm or so, 50mm if budget is tight) with a general purpose 15-85 instead… f/2.8 is useful, but nowhere near as effective in low-light than a fast prime :)
Cheers
Thk u so much.. cleared my head!!
now… for saving up for a 5DII….
Tangent comment, since you\’re waiting anyway, do check out any rumblings and rumors over at http://www.canonrumors.com/category/photography/c… for a possible 5DII replacement (highly unlikely it\’ll happen soon, to be honest). If there will be a new FF in the horizon, the 5DII may receive a price drop (or rebates) as well.
Again, those are just speculative rumors, don\’t take them seriously unless major sites like dpreview start mentioning it.
Dave
Thk you once again :)
Thanks for the review …. I am torn also between this, Canon 17-55mm F2.8, and Tamron 17-50mm f2.8 …..
I want fast lens …. specially for nighttime indoor flashless photography (that pretty much scrapped the Tamron, a friend just called me up earlier, his is gathering dust cause it won't AF very well in poor lighting condition) but the extra 2mm wide is just an attractive proposition for me specially in case I get to do a groupie shots at constraint space ….. or a nice outdoor landscape shot in case am off somewhere … so I will have to make do with my kitlens (18-55mm on a 60D) first while deciding
Would you say I can still get good nighttime stopping power with 15-85mm lens via a nice 430exII flash? :)
Also, Canon lenses are expensive yet they don't include the hood …..
@Ment
The Tamron focuses just fine with low-light, I know a lot of wedding photographers using this lens and I've tried it countless of times for actual shoots indoors with no issues. AF struggles depends on the ambient lighting condition and the camera's AF system as well, it's not that easy to fault a lens' AF performance, particularly with large aperture lenses. I suggest you give it a shot based on YOUR usual low-light shooting as well (borrow/rent).
As for the AF speed issue of the 15-85, the smaller aperture opening will make it AF a tad slower than the 2.8 counterparts, but AF issues are somewhat negated in low-light if ample AF assist lights are available such as the ones mounted on an external flash unit.
Since you have the 18-55 kit, the EF-S 17-55 and the Tamron 17-50 would be pretty darn similar in terms of field usability, the difference would be on other parts of the lens such as IQ, DOF, AF speed, and subjective bokeh, for the most part. The EF-S 15-85 would trump all three in terms of versatility.
Remember that the 15-85 is designed to be an all-around lens for a crop camera, while the 17-50 range is just a tad less flexible in terms of focal length options.
In terms of low-light 'stopping power' not even an f2.8 would do much good IMO, at the wide end, we're talking about 2/3 of a stop, at the 55mm range, about 1.5 stops… When a flash is used, then your subject-freeze result will be mostly based on the flash's burst and not as much on the shutter speed anyway.
Regarding the hood thing… Yes, it's ridiculous :)
I thoroughly disagree with your price/value argument. You get what you pay for. Considering the optical quality and the focal length range that covers 80%+ of the generally used range and the high build quality this lens is well worth the price – the Tamron and the Sigma may be f2.8 lenses but who cares and how often do you shoot wide open anyway. And at $600 for a substantially shorter range, the extra $120 for the Canon is no big deal. I bought mine to replace a Sigma 17-125 which was a surprisingly good lens and have absolutely no regrets – this lens blows the doors off the Sigma. Now if Canon would only get the lead out and make a top quality EFS wide zoom …..
Hi John, you're definitely entitled to your opinion about pricing, I'm sure Canon sees it the same way. No harm in disagreeing.
As for "how often do you shoot wide open anyway", most portrait and wedding photographers do, as a matter of fact, that's why many still prefer wider primes not just for low-light shooting. There's a reason why wide, constant aperture lenses are still the norm with pro-glass and only a few pro lenses (mostly in the telephoto range) offer variable apertures.
As mentioned in the review as well, there are very little issues with handling and IQ with the 15-85mm, it's a stellar lens, but variable aperture lenses rarely command such a high price. The same argument was made by many bigger site reviewers such as photozone, bob atkins, etc.
As with all lenses, there will always be a compromise between speed, optics, low price, focal range, and weight… Can't have all at the same time (yet).
Besides, what's expensive for some is cheap for others :)
Have a nice day <span class="idc-smiley"><span style="background-position: 0pt 0pt;"><span>:)</span></span></span>
Dave
No lens creep at all on mine no matter what mm it is at
That's unusual, you lucked out :) Your copy probably is still pretty new or has experienced low-usage for the rubber resistance to be firm enough to prevent the creep. I've tried three copies (one in Canon showroom, this current one, and a friend's copy) and they're all the same. Maybe it occurs as it ages, I hope not.
Practically identical to what CameraLabs shows here.
http://www.youtube.com/watch?v=UbScC8rl1W8, scroll to the 4min mark.