[LargeFormat] 480 Apo Nikkor Cell Spacing Question

[philip lambert]

Hi Ben!
For the purposes of comparison the depth of field of a 240mm f4.5 will be
similar to your 480 mm f9.  (or a 48mm f0.9!) i.e. minimal.
You could experiment with another such lens to see how critical the
focussing is.  As to whether Mr Grimes made a mistake I would be surprised
if he had but you could send the lens back to his successors for testing  PL
----- Original Message ----- 
From: <BenMarks@aol.com>
To: <largeformat@f32.net>
Sent: Sunday, January 25, 2004 1:00 PM
Subject: [LargeFormat] 480 Apo Nikkor Cell Spacing Question


> Fellows:
>
> I have a 480 Apo Nikkor which came to me as a barrel lens and which I had
the late Steve Grimes fit into a No.3 shutter for me.  I am having a hard
time acheiving sharp focus either at infinity or at relatively close focus
(around 6 feet).  I have enough bellows extension. Stopping down from f/9
helps, a little, but does not solve the problem.
>
> I wonder if there could be an error in the cell spacing in the shutter or
whether I am seeing the extremely shallow DOF that this lens is sure to
have.  Still, I'd expect to be able to focus on a point light source like a
highlight reflection (sunlight on chrome).  I don't use this lens routinely,
but needed it the other day and had to leave it home.
>
> Any ideas?
>
> Ben Marks
> benmarks-at-aol.com
>
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