imagemeister wrote:
IMHO, the non IS is sharper and in the long run, more reliable and maintenance free....
That's incorrect. In fact, the IS f4L is several years newer (2nd newest) and is one of two of the five Canon 70-200s that uses a fluorite element to deliver superior sharpness. The other one that uses fluorite is the latest 70-200/2.8L IS Mark II and these two are pretty comparable in sharpness at all apertures they share.
But, hey, don't take my word for it.... Compare test images made with the two EF 70-200/4 Canon lenses here:
http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=404&Camera=453&Sample=0&FLI=0&API=0&LensComp=104&CameraComp=0&FLIComp=0&APIComp=0Notice that they're pretty comparable at the center, but the IS lens offers slightly better image sharpness off-center and is definitely sharper farther out at the edges and in the corners. The superiority of the IS lens is most obvious at the 70mm end of the zoom range, with both lenses wide open at f4... There's less difference at the 200mm end of the zoom range.
Actually all five of the Canon 70-200s are pretty darned good. But you can see the differences in various lab tests on a number of websites to confirm:
- The 70-200/4 IS and 70-200/2.8 IS "II" are not only the two newest, they are also the sharpest of the bunch, probably due in part to their use of fluorite. And they also both feature 3-4 stop IS.
- The older 70-200/2.8 IS "I" (2-3 stop IS) and 70-200/4 non-IS are slightly less sharp and fairly comparable at apertures they share. It's not "bad" by any means and they are certainly very usable wide open, but stop them down to f4 and f5.6 respectively and they both sharpen up more fully. To put the difference in perspective, I haven't yet been able to justify spending $2000 to update from my trusty old 70-200/2.8 IS "I" to the latest and greatest "Mark II"! Eventually I'll wear the 15 year old lens out, I'm sure, but it's still a very good performer.
The oldest 70-200/2.8 non-IS is the least sharp pencil in the drawer, though it really is pretty darned good, too.
I have no reason to believe that the IS lenses are less reliable and more maintenance free, either. All five of the Canon 70-200s to date have been real workhorses, highly durable IS or not, pretty well sealed and fully internal focusing designs. I've been shooting with various IS lenses for as much as 15 years (including that 70-200/2.8 IS "I" ) without any issues or failures that I'd attribute to the IS or larger number of lens elements. One of my most used zooms, the 70-200/2.8 IS has probably taken upwards of 100,000 images.... maybe closer to 200,000.
I did have an AF system failure with my 300/2.8 IS... and an aperture issue with a 28-135mm.... both completely unrelated to their IS systems. But all of my other Canon IS (and non-IS for that matter) lenses - young and old - have never even given a hiccup... and they haven't had an easy life!
Some other differences: The Canon 70-200/4 lenses are about 2/3 the size and weight of the f2.8 versions. They also do not come with, but can optionally be fitted with a tripod mounting ring. The f2.8 lenses include a t'pod ring. All the 70-200s are L-series, which means they come with lens hoods. The f2.8 use a "tulip" style hood, while the f4 lenses use a "plain" but equally effective hood. The two f2.8 IS lenses also have a little more sealing against dust and moisture, than the other 3 lenses. Mostly this is just a rubber o-ring on the bayonet mount (the ring on mine tore off years ago), but might include some other add'l seals around the switches and moving rings. Not that they are waterproof or entirely dust proof... No Canon lens is. Some are just a little more "resistant".
Ultimately, with any lens longer than, say, 70 or 100mm where you have a choice of IS or not... I would always say get the stabilized lens! It is a very valuable feature and can at times make the difference between getting the shot or not. In most cases with Canon, if there have been or are both IS and non-IS versions, the IS version will be newer and often is optically better, too. However, the IS version typically cost more and many of the non-IS lenses are quite good performers, too, if your budget doesn't allow for the IS version.
EDIT:
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...Or, just switch it off when on a tripod....
Unlike some other IS lenses, that's not necessary with any of the 70-200s with IS. If on a tripod without any movement, the 70-200 IS self-detects and automatically turns itself off.
Yes, many of the Canon lens manuals suggest turning it off... but that's just to save a small amount of battery power that the IS will use (not much, BTW... I often shoot all day with IS running nearly constantly, without need to change batteries).
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Take a look at the Tamron SP 70-200 2.8 with VC. It's a great lens and it may be around the same price as the L without IS.
The Tamron is a good, and very well-respected lens. However, it's about $200 more than the Canon EF 70-200mm f4 IS (about $50 more if you get the tripod ring for the Canon lens, too)... and it's a lot larger and heavier. If you were looking at the Canon 70-200/2.8 IS Mark II, the Tamron costing $700 less certainly is a more attractive alternative. But not if you are considering the smaller and lighter Canon 70-200/4 IS, which still gives sharper edges and corners, as well as better contrast than the Tamron, particularly noticeable at f4 and throughout the focal length range.
With any third party lens, you also have to be a little concerned about future compatibility. There have been more than a few cases of Tamron... and especially Sigma... lenses that weren't compatible with a new Canon camera model. However, Canon L-series lenses are guaranteed to be fully compatible with all Canon EOS cameras past, present and future. Sometimes the third party lens manufacturer offers an update for an older lens that's incompatible with a newer camera, but also sometimes they don't. Sort of depends upon whether the lens is very current, how valuable the lens is, and whether it's even possible to make a fix rather simply, such as through a firmware update.