> Another question I have pertains to the EF 28-105/3.5~4.5 (old version)
that I
> just picked up to go with the 7 for hiking/backpacking use (this also
pertains
> to the 20-35/3.5~4.5): The instructions say to switch to manual mode for
manual
> focusing, and cautions to not touch the focus ring when focusing using the
AF.
> Does this mean that this lens does not support full-time manual focusing
even
> though it's a USM lens? I have assumed that my 20-35 and now the 28-105
have
> FTM, and I've not noticed any unusual resistance when using the focusing
ring
> with the lens set to AF, but the instructions seem to indicate otherwise.
Any
> ideas?
>
> Thanks!
>
> Craig Callahan (fcc)
I believe they are cautioning not to turn the focus ring, cause it will
throw the autofocus off when it's trying to focus. I haven't had any
problems with full time manual using touch up manual after auto focus, but
it'd be crazy to turn it when autofocusing, no?
Jim
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