P3D Re: Replacement Lenses for KI

[Michael Kersenbrock <michaelk@xxxxxxxxxxxx>]

"Grant C. Campos" wrote:

> I'm taking into consideration the lenses in combination formula "Ftotal = (F1xF2) / (F1 + F2 + distance between the
> lenses)".  And am assuming that the resulting focal length is measure from the center of the two identical lenses,
> or proportionately between differing focal length lenses.  That means if I used two 85mm Achromats, or an 85 and a
> 75, I could put them in my Kodaslide and it would work.
> 
> Is there something I'm missing?  It would still be less expensive than the Combi viewer.

That's basically what I did with my Airequipt stereo Theater viewer, and it
worked okay.  Biggest problem is that the achromats were *THICK*, and having
two of them made the mechanical aspects worse. Of course if you had triplets
before.... :-)

I also still had a tiny bit of rainbow effect (on the edges). Although 
tremendously better than the original lenses, I hoped for perfection.
Could have just been the quality of the lenses (surplus ones rather than
going the big bucks with Edmund).

Mike K.

> 
> Grant


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