juststeve Offline Upload & Sell: Off
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p.1 #18 · p.1 #18 · +17 AFMA with 1.4x and 100-400II, send it in for calibration? | |
I would check all mount screws, lens, converter and camera mount. If even one is slightly loose it could cause a problem. The amount of strain placed on a converter mount while carrying a lens around all day is considerable.
It is a problem that I have seen with my lenses and converters since I often hike long distances in very rough terrain with camera, converter and lens on my shoulder, on tripod and not.
Interesting, to me anyway, is I have Mark I, II and III 1.4 and 2x converters, purchased from 1990 to a couple of years ago. They all change the AFMA the same over several different lenses. Offhand, I cannot remember if it is +1 or -1. But this is why I recommend first carefully checking the mount screws for looseness.
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