[LargeFormat] 480 Apo Nikkor Cell Spacing Question

[Jim Hemenway]

I have two process lenses, while they give good coverage for 11x14 at 
infinity, there is so much of the outer areas which are just a little 
out of focus, that they're really only good for 8x10.

A retired optics guy from Polaroid, told me that the process lenses have 
just one element less than their non-process lens twins.  This is 
because they were not meant for infinity use but instead for 1:1 
copying... that it was cheaper to not include the missing element since 
it wasn't needed.

I don't know how true this is, but I can tell you that I've given up on 
them for 11x14 use EXCEPT for macro work, when they are sharp all over 
the 11x14 piece of film.

Jim - http://www.hemenway.com


philip lambert wrote:

> That's an interesting thought. I have a 360mm ApoNikkor that's clearly a
> process lens. Are these tricky in some sense other than having no shutter?
> Philip
> ----- Original Message ----- 
> From: "Jim Hemenway" <Jim@hemenway.com>
> To: <largeformat@f32.net>
> Sent: Sunday, January 25, 2004 4:32 PM
> Subject: Re: [LargeFormat] 480 Apo Nikkor Cell Spacing Question
> 
> 
> 
>>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
> 
>