I don't have one at hand but I would be very surprised if it's not very
close to 25mm. What might make your project more interesting is to use a bad
50/1.8 as the tube so that you have a helicoid giving you an adjustable
extension tube (similar to the apprx $50 vivitar macro TC). The only thing
magical about 25mm is that it gives 1:1 with the 50mm macro.
-jeff
----- Original Message -----
From: "andy pang" <pangandy@xxxxxxxxxxx>
>
> Hi guys, I'm new to this group. Need some help on extension tube. I want
to
> homebrew a 25mm manual extension tube (MET25). Can someone measure the
size
> of the extension tube from top to bottom ? is it 25mm then ? I'll be using
> the body plate from an om10 and lens plate from a 50F1.8 lens. The
> mid-section... haven't got a clue yet. any suggestion ? Thanks in
advance
> Andy
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