RE:

["George L Smyth" <glsmyth@xxxxxxx>]

> -----Original Message-----
> From: owner-infrared@xxxxx [mailto:owner-infrared@xxxxx]On Behalf Of
> Charles Jay Pilzer
> Sent: Friday, August 06, 1999 11:19 PM
> To: infrared@xxxxx
> Subject:
>
>
> I have an old Super Speed Graphic with a very good Rodenstock
> lens. How can
> I determine how far to extend a 135 mm lens beyond the point of focus for
> visible light to focus properly for Kodak HIE infrared film with
> a 87 or 89
> filter?

Hopefully, you'll use HSI, as opposed to HIE. <g>

Kodak suggestes that you extend the lens 1/4% of the focal length, so we're
talking about less than half a millimeter.  Personally, I stop down to about
f16 when shooting my Crown Graphic with my 150mm lens.  No problem.

george

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

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