Donald S. writes:
<< Which is the more accurate indication of correct infinity focus
[split image biprism or matte]? >>
The matte surface is more accurate. The biprism gives the illusion of
greater precision, which isn't the same thing as accuracy. (As society
hopefully learned in the Florida ballot counts). With the biprism,
viewing angle of your eye can shift the image.
Gary Reese
Las Vegas, NV
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