What happens to the effective maximum aperture of the macro lenses (80,
135) when they are mounted on the tele auto tube or bellows for which
they are obviously designed to be primarily used. Are they rated at f4,
f4.5 with the tube? And I suppose the total amount of extention matters?
How would I compare the 80/f4 for example with the 50/f2 + 25mm? Or say
the 50/2 + 2xa and the 135/4.5? I'm totally overwhelmed by the
possibilities. Can someone recommend a book that would help sort this
out?
mike
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Latitude 48° 32' North, Longitude 123° 7' West
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