#6 makes sense also.Originally Posted by peety3
Stuart - I do not think anyone answered your question about taping the contacts when using a TC. I have tried it with my 100-400 L with a 1.4X II TC on a 7D (which I would guess should be better than your rebel), and it performed horribly. If you want to increase your frustration level with missed shot after missed shot while you are waiting for the focus to acquire, then it is a way to go... or you could just put it in live view and auto focus with the little box (even have the option of 5X and 10X focusing) without the tape and still achieve focus almost as fast as taping contacts. I am not sure how it would perform with the 400 mm prime, but I would guess it would have similar results.
The other problem with TC's on a camera that does not have good high ISO capability is the light seems to always be to low to get a decent shutter speed (the problem I had with the 7D focused using LV... auto or manual). I finally made the jump to FF with a 1D X, and I am really loving the ability to set my ISO at 1250 to get my shutter speed faster that 1/1000 sec. The bad part is I miss the 7D crop factor... so the 1.4X TC lives on my 100-400 mm most of the time. However, because I now have the ability to get shutter speeds up with higher ISO, it outperforms the 7D (even if I crop some). I very seldom produced an acceptable image with my 7D with the TC/100-400 combo, but I regularly do with the 1D X; and I attribute much of that to being able to get the shutter speed up. Which is also the reasons why neuro was pushing the IS need.
I wish a 600 mm f/4 L IS II was in my future, but that is not likely.
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