Re: [Largeformat] 100mm WF Ektar

[Douglas Cooper <douglas@metaversalstudios.com>]

At 06:53 PM 9/5/00 -0700, you wrote:
>The retaining ring diamenter of a 100mm WF etar is 38.1mm or 1.5".
>Format with swings and tilts: "3*x4*
>Format without swings and tilts: 4x5
>  Angle of view when focused at infinity at maximum aperture: 54°x65°
>Lensboard mounting Hole Diameter: 38.1mm or 1.5"


Okay, this is peculiar.  I had a board drilled to 1.5", and both my 100mm 
WF Ektar and my 203/7.7 Ektar are about 2 mm too small.  I don't get 
it.  The two lenses are the same size -- you can switch the retaining rings 
back and forth -- but they're too small for the new board, and too large 
for my #0 board.  Does anyone know anything about this Supermatic size?

I've managed to jerryrig them in the new board -- I just put masking tape 
between the lens and the face of the board, and this supplies enough 
friction/stickiness to prevent the lens from moving -- but I don't know 
whether to remain satisfied with this.  Not that the Gowland requires 
precise positioning... there are no zero detents.

One thing, however:  the outside of the *flange* extrusion is in fact 
1.5".  Is this how flanges are supposed to be mounted, with the extrusion 
poking through the hole?  And if so, how precisely is it done?


DC




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