Re: Medium format (was: plastic sheets

[George L Smyth <GLSmyth@xxxxxxx>]

Jaap Los wrote:
> 
> I own a Nikkor 2.8/80-220 mm ED zoomlens, a beauty. I understand from
> your mail messages, that I don't need to refocus this lens for IR
> photography?? Mind you, there is a special IR focus indicator on this
> lens, meaning, that a refocus is needed. Am I right? Or will the
> ED-element sufficiently correct also for IR? Is there any difference for
> using HIE, Konica 750 or SFX200/Agfa200 as regards to IR focus
> correction?

Konica and Ilford really don't need correction, as they don't go as far
into the IR as HIE. This means that visible light will probably dominate
the scene.  Actually, I don't normally adjust focus anyway because I'm
closing down to F8 or more and depth of field covers things pretty well.

george

- -- 
 Handmade Photographic Images     
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