Re: IR refocusing on APO LF lens

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 13 Apr 98 at 15:53, Douglas Benson wrote:

> Good queastion! I am a Mamiya RZ user and, as such, sent a similar question
> to Mamiya almost a month ago and am still awaiting an answer...must be a
> pretty tough Question. I will let you know if I receive a reply.

The Mamiya RZ brochure specifically mentions that these APO's are
suitable for infrared without focus-correction. Same goes for the
equivalent APO's for RB of course.
Yet the spectral chart that is listed below this text in the RZ
brochure stops at 750nm, with a steady flat line ending by
800nm....so it doesn't say much in case of HIE, which would require
the most correction, if any.
But the fact that Mamiya sells a 70mm back might be a secondary 
argument that they not just mean Konica 750IR, but also HIE.

PS: does anyone know the market value of a 500/8 non-C lens?
The Mamiya APO's are tempting, but they also seem the ultimate 
example of incremental gain related to a huge price....:-))


- -- 
Bye,

Willem-Jan Markerink


      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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End of Infrared-Digest V0 #496
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