Recently [EMAIL PROTECTED] wrote:
>
> As you can see, only the FA* 85/1.4 demonstrated a noticeably different
> (shorter) focal length from the others, and only at a close focus distance.
[...]
> I assume that this is because the FA* 85/1.4 is
> an IF lens, so that it is supposed to "lose" some focal length when it is
> focused at close range. (Maybe?)
Bingo! Try the same with your 100/2.8 and 100/4 Macros... Actually, I
first meant that as a joke, but not that I think of it, please take a moment
and try it out. Please tell us how significant the focal-length difference
is at 1:2, and if you have the time and desire, maybe also at 1:1 (tubes
needed for the 100/4 lens).
Cheers,
Boz
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