Re: Adjusting older cameras to focus IR

[George L Smyth <GLSmyth@xxxxxxx>]

J.Wood wrote:
> 
> Kodak recommends "an extension of the bellows by 1/4 of 1% of the focal
> length of the lens."  My experience with large format IR is using a tripod
> and f16 and smaller and making no adjustments.

I very slightly exten the bellows.  Just about the same as no
adjustment.

> Also use metal sheet film holders if possible

I've found my Riteway holders to work just fine.  Look for five dots on
the slide where you put your fingers.  If there are five dots there, the
slide is IR opaque.  If not, you're on your own.

george

-- 
 Handmade Photographic Images     
  http://www2.ari.net/glsmyth/

------------------------------