The definitive list - with Leica in its rightful place? :)
You'll not that Nikon is not 50mm - but you may have to make
allowance for where the pinhole will lie in relation to the lens
mount surface. If using a modified body cap, for instance, it may be
a mm or 2 in front of the actual flange.
Leica (screw) 28.8 mm Leica (M bayonet) 27.8mm
Canon (screw) 28.8 mm Canon (FD and earlier) 42.1 mm
Nikon 46.5 mm Minolta 43.5 mm
Pentax K 45.5 mm Exacta 44.7 mm
Alpa Bayonet 37.8 mm Contarex 46.0mm
Contax RTS 45.5 mm Ikarex BM 44.7mm
Konica Autoreflex 40.5 mm Miranda 31.5mm (41.5 mm?)
Olympus OM 46.0 mm Praktica/Pentax * 45.5 mm
Petri Bayonet 45.5 mm Ricoh Bayonet 45.5mm
Rollei 35 44.7 mm Topcon DM 44.7 mm
Voigtlander 44.7 mm Yashika FR, FX 45.5
Olympus is 46mm from film plane to the flange I believe.
Dan
----- Original Message -----
From: c andrew chadwick <chadwick@xxxxxxxxxxxx>
Date: Monday, August 25, 2003 1:33 pm
Subject: [OM] pinhole focal length
So I'm interested in making a pinhole body cap for my om-1.
There's a
place near to me that makes laser drilled pinholes, but in order
to get
the "optimum" width, I've got to know the depth of the camera,
from the
pinhole to the film. I'm reasonably sure that someone on this
list has
done this before, so does anyone have an idea as to what that
depth would
be? I know that on my other camera (8008) it's 50mm, but I
wouldn't want
to assume that it's the same for the OM-1.
Thanks,
andrew
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