Darin Rhein wrote:
>Hi,
>On the subject of extension tubes and the 50/3.5 macro. I notice that the
>only specs in eSif, or anywhere else I've seen, are for the 25mm tube to
>reach 1:1. What I've been wondering is, can you go beyond that; ie, adding
>another 25mm to get even greater enlargemant? And if so, how would one
>figure out what the ratio would be with a given amount of extension?
>
You may certainly use more extention. However, Oly recommends that the
lens be reversed for best results once you go past 25mm of extention and
1:1. They then show it used up to 3.5 x magnification. The easiest way
to do all this is with the Bellows or Auto Bellows, as they are designed
both to make variable extention easy and to make lens reversal easy. The
tables for extention, magnification, subject coverage, etc. are on pages
18-19 of the instructions
<http://olympus.dementia.org/eSIF/om-sif/macrophotogroup/manuals/auto_bellows.pdf>.
There are also useful tables for what you want on pages 9-11 of the OM
Way tables <http://olympus.dementia.org/Hardware/PDFs/OM_Way-tables.pdf>.
Moose.
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