Chris B. asks about the the >500,000 version:
<< I found that the aperture closes slightly when I select the aperture
to smaller than 3.5. Once it has closed slightly, probably to 4.5) it
remains constant throughout the aperture or zoom range. On the other
hand, when I zoom it with 3.5 selected, the aperture does not appear to
change in
size - i.e. from 3.5 to 4.5. Does the one you are testing do that? >>
Yes, the one I'm testing acts that way. The <500,000 doesn't.
Here are some other differences:
<500,000 = 16.3 oz., 106mm long (extended), 86mm long (retracted),
focusing grip 42mm wide, infrared focusing dots (red) above aperture
ring and below 105 on distance scale barrel, no variable aperture dot,
rear element flat and nearly flush with back of lens.
>500,000 = 16.7 oz., 107mm long (extended), 87mm long (retracted),
focusing grip 38mm wide, no infrared focusing dots, variable aperture
dot (white) between 3.5 and 5.6 on aperture ring, rear element recessed
and convex.
Bottom line: different optical formulas and mechanical configurations.
Gary Reese
Las Vegas, NV
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