Re: [Largeformat] 100mm WF Ektar

[Les Newcomer <lnphoto@ismi.net>]

The lock ring (flange) should fit this (1.5") hole nicely, precisly and
smoothly. I remove the rear cell(if its larger than 1.5"dia), put the
shutter in from the front,thread the lock ring down, adjust the board
until the lock ring drops into the hole (not through it!), then tighten
it up with a lens wrench if i can find it. Thread the rear element back
on, and voy la!

Les

Douglas Cooper wrote:
> 
> 
> 
> [eGroups] My Groups | Largeformat Main Page | Start a new
>           group!
> 
> 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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