P3D RE: matched lenses

["David W. Kesner" <drdave@xxxxxxxxxx>]

In photo-3d digest 3039 Bob Maxey asks for RBT owners to speak 
up about their lenses.

Well I have an RBT X3A (the 24x33 option - not full frame) with the 
Pentax 28-70 f4.0 constant aperature zoom lenses. I have found 
them to be matched extremely close at both ends (28mm and 
70mm) but slightly off near the center (50mm). This is obviously a 
lens problem and has nothing to do with RBT's matching and 
coupling of the lenses. Does anyone have an explanation for this?

On another note, I have had two Realists with 3.5 David White 
lenses and one with 2.8 German lenses. One of the 3.5's was not 
matched well at all and the other was tolerable. The 2.8 on the 
other hand is as perfectly matched as you can get. OK, as 
perfectly matched as my eyes can test in a Themelized Red 
Button and projected in a TDC 116. I must say that I can detect 
some pretty minor differences though.

Thanks for the time,

David W. Kesner
Boise, Idaho, USA
drdave@xxxxxxxxxx


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