jared_kipe said:
Originally Posted by robertflojo
Dark,
I am a professional photographer. I've used the 70-300 and for motor cross it would not be able to focus fast enough. Plus for motor cross I'm sure you would have to shoot at a high shutter speed anyway so the IS wouldn't really help you there. I would go for the faster 70-200 F4 constant aperature. Also the quality glass is poor with alot of barrell distortion and cromatic abberation. Hope this helps.
Robert
Maybe you were looking at a particularly flawed copy (or maybe thinking of the older 75-300mm IS which it replaced). Most places find this lens to be very nice with almost no distortion, and good IC.
Agreed. I think the general problem here is that Canon makes a bunch of 70"ish" - 300mm telephoto's, at different performance/quality and accompanying prices, so its pretty easy to get them all confused. To the best of my knowledge (plus some research), the EF lenses that you might find today could include:
1. $160 75-300 III
2. $190 75-300 III USM
3. {$450} 75-300 IS .............. (introduced 1995; now {discontinued})
4. $570 70-300 IS USM .......... (introduced Oct 2005 - just four months ago)
5. $1150 70-300 DO IS USM ... (introduced June 2004)
I've listed #3 despite it being replaced by #4. With the very recent introduction of lens #4, I saw that there were still examples of #3 inventory still being around and offered for sale this past Christmas holiday shopping season...
which was a 'Caveat Emptor' for the consumers.
There have been performance complaints about #3, and I suspect if the same standard were applied to #1 and #2, these would probably perform around the same as well.
Reviews on #5 and #4 did indicate that Canon did make improvements, but considering that its roughly a decade newer design and of comparable or higher prices, one would reasonably expect the bar to be raised...both of expectations as well as delivered performance.
And in looking at the stated objective of "telephoto on fast moving subjects", I have two general guiding opinions:
a) If I'm spending a decent chunk of change for a piece of telephoto glass, how much extra is it to get IS while I'm at it? Objective is to try to save money in the long run by not buying the same basic lens twice (or 3x).
b) For fast-moving subjects, if I've already expressed a willingness to spend a bit more to gain a stop (from f/5.6 to f/4), am I also willing to spend a little more than that to gain another stop (from f/4 to f/2.8)?
Yes, the direction I'm leaning is towards the 70-200mm f/2.8 with IS. It is expensive, but its a "buy it once and you're done buying" type of lens for this general focal length.
Dark, I'm in Northern NJ, so if you want to hook up, I can let you try my 75-300 IS (#3). I also have a 70-200 f/2.8 IS too (and a 1.4x), which I'd bring along while I'm at it.
-hh