They are ratios of magnification. If you have 1:1 the image on film is the same
size as life. 1:2 half size and so on. The 50mm f2 I have is capable of 1:2,
but if you add a 25mm extension tube it goes up to 1:1. The lens is scaled with
focus distance like other lenses and a ratio scale that runs along side it. If
you put it or another lens on a bellows unit you go even further with
magnification possibilities.
Depth of field is then a big issue so using small apertures is a must.
Dan S
> ?Bill Barber advised me that the 60-300 had a pretty good macro?
>
> OK, I have to ask the elementary question: What do you mean by
> macro range? I never used the macro setting on my lens (the Sigma
> I recently acquired and wrote to the list how happy I am with it).
>
> As far as I understand, macro setting allows to focus closer.
> Never bothered to understand what 1:1, 1:4 etc. means, but now I
> am curious.
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