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Re: LF infrared questions

  • From: w.j.markerink@xxxxx (Willem-Jan Markerink)
  • Subject: Re: LF infrared questions
  • Date: Thu, 23 Jan 1997 01:23:09 GMT
Cought this note on r.p.*:

>In Ansel Adams book "The Camera" on pages 53&54 he talks about the
>correction required for infared film.
>He says; "The required adjustment is normally to advance the lens about
>1/70 of its focal length, and this compensation can be marked on the
>view camera bed." He also mentions that some lenses are corrected into
>the infared region and thus require no adjustment.
>
>Good luck
>
>Morley Selver

This does not comply to the more often seen rule of 1/4% of focal 
length....1/400th, a factor 6 less....
I know the lens design has a large influence, but rules of thumb should be 
equal....

Anyone?

--
Bye,

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      The desire to understand
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]

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