To those that have used a 2X tele-extender with a telephoto (200 or 300mm), what do you seem to find to be the compromising element...loss of sharpness, contrast, etc? When I used a 300/4A* with a 2x-AS I was always impressed with its results. But now with another system I'm getting a slightly diffused image with a 70-200/2.8 and 2xEF, more so than I would have expected.
I read somewhere that a zoom basically already has a teleconverter built in. I'm not sure how technically accurate that is, but in a way it makes sense. I've never found a zoom/tc combo that worked well.
- MCC -----
Mark Cassino Photography
Kalamazoo, MI
http://www.markcassino.com
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