[LargeFormat] Bellows extension with a 180mm.

[Karl Wolz]

180mm = approximately 7 inches, which is about what the bellows extension
should be at or near infinity.  Were you measuring from the back of the lens
or from the position on the lens where the lensboard would reside.  This
should be near the nodal point of the lens, and tends to actually define the
focal length of the lens.

Karl Wolz

----- Original Message -----
From: "Robert Mayrand" <dnaryam@videotron.ca>
To: <LargeFormat@f32.net>
Sent: Thursday, December 20, 2001 8:07 AM
Subject: [LargeFormat] Bellows extension with a 180mm.


> I did some testing on one of my project with a 180mm symmar-s.
> Focusing at about 4 feet the distance between the lens and the ground
glass
> was less then 6 inch. Is this normal? it sure seem little I'm afraid of
what
> estension will be on normal landscape a few inches maybe!
>
> The lens was mounted when I got it on an aerial camera with a fix distance
> between the ground glass and the lens, I'm starting to be afraid that the
> back element might have been modified or change is there a way to be sure?
>
> Thanks
>
> Robert
> Mtl, Quebec
>
>
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