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Strodav wrote:
.............. Another thing is that it is only f 2.8
at focus distance of infinity. It is actually f4.8
at 1:1 or minimum focus distance. ............
Are you aware that if it were a traditional macro
such as old "Micro Nikkors" or any of the similar
classic macro lenses, then f:2.8 would be f:5.6
at 1:1 ? It's simple physics.
FWIW, any 60mm f:2.8 lens slows only to f:4.8
at 1:1 is signifying that it shortens its actual FL
in order to focus closer .... rather than relying
solely on extending the glass further from the
"film plane". IOW, it means your 60mm macro
is approximately a 45mm macro. It's a 60mm
genral purpose lens, but is shorter for macro. It
is the reason you have so little working distance
in the macro range ... the FL gets shorter as it
focuses closer.
That is the nature of internal focus. My 28-300
has IF, and at its near limit, even tho the zoom
ring says 300mm, the real FL is about 140mm.
At 6 or 7 feet, it's about 200. No problem if you
are doing a head shots with my zoom, but real
annoying with your 1:1 macro lens :-(
A traditional 300mm lens at about 5 or 6 ft will
FILL the frame [24x36 "FF"] with a dollar bill.
Here's the 28-300 zoom at "300mm" doing a
head shot at about 5 feet. If you've ever used
a classic 135 tele on a film camera, you would
recognize that this is about the same thing. It's
just the nature of internal focus.