oldgeezer3 wrote:
I have been looking at the Canon 100 - 400mm lens for birding. Now Tamron has the 18 - 400! I would like to see a thread on UHH with some downloaded photos using that lens!!! compared with the Canon 400mm or 100 - 400mm lenses. I know, the Canon lenses are faster but the price....
IMO, there's really no comparison... The Tamron 18-400mm is a crop-only lens with slower focus drive, lower performance stabilization (requiring faster shutter speeds and higher ISOs) and a 7-blade aperture that's less capable of smooth background blur effects than some of the other lenses listed here. This "do everything" type of lens simply HAS TO compromise in some respects... The first and most obvious being that it's only usable on crop cameras, while all the other lenses are full frame capable. It's also not got as good image quality... in particular it's a bit softer at some focal lengths, especially wide open and particularly in the corners or at the edges of images. I haven't used it and there aren't a lot of in-depth reviews yet, so can't say if it has issues with chromatic aberrations. With such an extreme (22X!) zoom I'd also expect some signification distortion at the extremes... barrel and pincushion. And because the lens hood has to be able to work with an 18mm wide angle, it's far less effective at the telephoto end. A lens like this is all about convenience... great for travel or anyone who simply doesn't want to carry much gear. It'll probably be fine for modest size prints - 4x6, 5x7... maybe some 8x10 - or most online image sharing. Just expect some compromise if you ever want to make larger prints or need to crop your images very much. You won't have much latitude with this lens, as much as you would with the other lenses listed here. While the Tamron 18-400mm is pretty amazing, it's simply not in the same class as the other lenses here.
The Canon EF 100-400mm II IS USM is pro-quality build, materials and images. The guys at Lensrentals.com love to take things apart to see what's inside, and when they did a tear down of the 100-400 II, they called it "the best built zoom they'd ever seen" (I don't think they'd taken apart a Canon 200-400mm f/4L 1.4X, though). It uses a fluorite element (as do many other Canon telephotos), which you won't find in ANY Tamron, Siggy or Tokina. Nor in any current Pentax, Olympus or Sony lens... Nikon only just this year updated their 70-200 and several of their big primes with fluorite... but charges premium prices for them (the Nikkor 70-200 is $1000 more expensive than the comparable Canon).
The 100-400 "II" also has advanced three to four stop Image Stabilization. It's IS features "Mode 3" - "instant stabilization" - like the Canon super telephotos that cost 3X, 4X and 5X as much. The Canon lens also is said to work well with their 1.4X teleconverters (on cameras able to autofocus an f/8 combo... personally I haven't tried it yet because I just haven't needed the add'l reach). Of course, for $1900 one might expect the Canon 100-400 "II" to be top notch. That's a sale price, it was selling for $2200 until recently.
The original, 16 year older Canon 100-400mm "push/pull" zoom is still widely available, now selling for $1300. In spite of it's age, it's also a fine lens, uses fluorite and comes with a tripod mounting ring. Note: It's one of five Canon lenses that require IS be turned off by the user, when it's locked down on a tripod or in other situations where there's no movement. If IS isn't turned off, an effect called "shake return" can occur when there is no movement at all for IS to correct. It's sort of a feedback effect, where the IS actually causes shake, when there is no movement. The 100-400 "II" and most other Canon IS lenses don't do this, but the original 100-400mm is one of five older models that's known to do so. The original 100-400mm weighs a little less, too... just over 3 lb. versus close to 3.5 lb. for the "II".
But the Tamron 100-400mm VC USD appears to be pretty darned good.... and at $800 it's a lot less expensive. Note that it doesn't come with a tripod mounting ring... although one is available to fit it, sold separately (an add'l $129). The Tamron is the lightest of the four, at just under 2.5 lb. However, no doubt that's without the tripod ring, which might add close to a half lb. There are almost no independent user reviews of the Tamron yet... some early test shots done with it appear pretty good... but more in-depth review and comparisons are needed.
The Sigma 100-400mm OS HSM is even a little lower price right now, on sale at $700. But that lens doesn't come with or have option of fitting a tripod mounting ring, which I consider a big mistake. The Siggy 100-400 was announced about 6 months prior to the Tamron and has been available for a while, so there are quite a few reviews of it. The Sigma is also 1/3 stop slower than the Canon throughout the focal length range... It starts out at f/5, but drops to f/5.6 at just over 100mm. In comparison, the Canon is f/4.5 up to about 135mm and then remains f/5 until 300mm. The Sigma further drops to f/6.3 from about 235mm and longer. So in truth the Canon lens is more like 2/3 stops faster at a lot of focal lengths. This may be part of the reason the Canon 100-400 "II" seems to have a little faster autofocus acquisition and more consistent tracking of moving subjects.
All three of the current 100-400mm use a 9-blade, curved blade aperture. The earlier Canon push/pull zoom uses an 8-blade aperture.
For close focusing, the Tamron specs suggest it's the best of the bunch and is claimed to be able to give 0.36X magnification. The Canon 100-400 "II" is close, at 0.31X. While good, the Sigma isn't as close at 0.26X. The old Canon 100-400 push/pull version is the worst, at only 0.20X.
The Sigma and the Tamron both use 67mm filters. Both Canon 100-400mm use a 77mm filter (and so does the Nikkor 80-400mm).
The Tamron's optional tripod mounting ring has a neat feature that other lens manufacturers would be wise to adopt: It has built-in Arca-compatible quick release dovetail. The Canon lenses don't have this and, in fact, the shape of the tripod foot of the 100-400 "II" makes it difficult to effectively mount an Arca-type lens plate. Replacement feet with an Arca-style dovetail are available from several sources (Really Right Stuff, Kirk Photo, Hejnar Photo). But those add some cost... roughly $75 to $100. Those third party tripod feet are more secure mounting than the Canon, too (which uses a thumb screw to allow easy removal without tools... I found that hard to tighten up as snugly as I'd like.) Note: Apparently Tamron has done similar and incorporated an Arca-style dovetail in their latest 70-200mm f/2.8 zoom, too. Canon (and NIkon, Sigma and everyone else), please take note!
Nikon shooters would want to compare with the AF-S 80-400mm VR II ($2300, 77mm filter, close to 3.5 lb.), which has quite similar, pro-quality build and performance to the Canon "II". There also is the Nikkor AF-S 200-500mm f/5.6 VR for just under $1400, though it's not got the same level of build quality, sealing, etc. as the 80-400 or Canon lens. The 200-500mm alsouses 95mm filters, is considerably bigger and heavier at about 4.5 lb.
The Nikon 80-400mm, both Canon lenses and purportedly the Tamron all have extensive sealing for weather resistance. Not sure if the Sigma or the Nikkor 200-500mm are as well sealed.
All these lenses come with a matched lens hood. The Tamron and Sigma are simple bayonet mount type hoods. The Canon is a newer type, similar to what they've been including with some other lenses, bayonet mount with a more secure latching and release mechanism. It also has a little "door" in the underside to allow access to filters that require rotation (such as a circular polarizer). The Nikon 80-400 uses a standard bayonet mount, but is a "tulip" style hood, while all the others aren't. All the lenses' hoods can be reversed for storage.
None of the above lenses are internal zooming. That means they grow in length significantly when zoomed to the longer focal lengths. That changes balance a bit, which can be noticeable if using them on a gimbal mount in particular. If you want an internal zooming/internal focusing zoom, be prepared to carry around larger, heavier gear and get ready to spend a lot more. The Nikon AF-S 200-400mm f/4 VR II costs almost $7000, is 5" in diameter and almost 15" long (w/o lens hood) and weighs close to 7.5 lb. The Canon EF 200-400mm f/4 IS USM with built-in, matched 1.4X teleconverter (it becomes a 280-560mm f/5.6 at the flip of a lever!) is even pricier at $11,000, bigger and heavier at almost 8 lb. Both these super telephoto zooms are incredibly high quality and top performing.... but at significant cost!