Some sources of information that might help
http://www.photozone.de/8Reviews/len..._4is/index.htm
http://www.dmcphoto.com/Articles/Canon300f4/
http://www.wlcastleman.com/equip/reviews/300mm/

I opted for the Canon 300mm F4 IS lens and the 1.4x TC and image quality
seems very good, however the flexibility of the 100-400 zoom should not be
overlooked

Phil Martin






"Eric Miller" wrote in message
...
I have a Canon EF 400mm f/5.6 L USM. What I would really like to have is
this same lens with IS. At this point, the actual options (without
quintupling the price) are the Canon 100-400 IS, 300 f/4 IS + 1.4 TC and
the Sigma 80-400 IS. Sure, the 400 DO IS and 400 2.8 IS are available, but
not in my price range. So, what is the likelihood that a) Canon will come
out with an 400mm 5.6 IS replacement for my lens; b) a third party will
make a compatible 400mm f/5.6 IS/OS/VR non-zoom; or, c) someone will make
an IS/OS/VR teleconverter in Canon mount?

Second question: Has anyone made an actual comparison of the realistally
expectable photo quality between the 300 f/4 IS + 1.4TC, the 100-400 IS,
80-400 OS and the 400 f/5.6 L that takes into account the results
obtainable with IS? I'm not just talking about optical quality, but
general sharpness of photos in the real world, giving the lenses with
IS/OS their due. I'm starting to suspect that whatever marginal benefits
the 400 f/5.6 L offers in optical quality is outweighed by the benefits of
IS/OS for certain applications, like the small bird photography that I do.

The other option, is, I gues, using a gyroscopic stabilizer like the ones
offered by Kenyon Labs, but those aren't exactly cheap.

Eric Miller
www.dyesscreek.com