JonB Offline Upload & Sell: Off
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p.1 #1 · p.1 #1 · Canon 1.4x Teleconverter and 100-400 F4.5-5.6L IS | |
Hi, All. Having gotten tired of waiting for Nikon's D2x and jumping ship to Canon instead (short-term pain for long-term gain, I hope), I replaced my D100 and 80-400 VR with the 20D and the 100-400 IS. I'd also like to replace my Kenko 1.4 teleconverter (for the Nikon) with one for the Canon. I have a question about using one with the 20D and this lens.
In the Nikon world, they state that autofocus will be lost with any lens with an effective aperture narrower than F5.6 (F5.6 + 1.4x = F8). This isn't completely true, as I know by experience, with the 80-400 and a 1.4 teleconverter - the (already slow) AF just slows down more, and you need bright light. Is it the same with the 20D, the Canon 1.4x extender, and the 100-400? Or are just just plain out of luck? If the Canon doesn't allow AF, do the Kenko or Tamron extenders allow AF with this body/lens combo?
Thanks for whatever info you can give me.
- Jon
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