[LargeFormat] 480 Apo Nikkor Cell Spacing Question

[Jim Hemenway]

Ben:

Is the subject 480 Apo Nikkor by any chance a refugee from the printing 
industry, that is, a process lens?

Jim - http://www.hemenway.com



philip lambert wrote:

> 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