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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12600
Loc: Cumberland, R I , USA42N71.4W
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Re: William Optics 7x50 ED binocular minireview
11/19/05 09:28 PM
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If this binocular were made available in 10x50, and met the same criteria I see in this sample, I would think it would vie for position as one of the best 10x50s on the market.
I did not dismantle the binocular to inspect all glass surfaces, and i'm sure I won't. Also, I'm not sure I would trust colors of reflections in the objective lens or the outer eye lens to give me an indication of what kind of (or if any) coating is on any other surface.
Thanks for the comments.
Tonight I observed a 22" double cleanly split for an apparent separation of 154 arcseconds. Actually, I expected this, and it's in line with other binoculars. I'm curious to see the transmision (LM on M45 chart). But my eyes have been in front of this screen for hours, so maybe another time.
This afternoon I pulled out several other binoculars to test CA. I was impressed that the WO ED did not show any edge CA when looking at tree branches against sky background. So I wanted to check on the same branches while still under bright skylight how several others performed.
Oberwerk 8x56 shows purple band one side, green on the other.
Captain's Storm King Mark II 7x50 (older version Swift origin) shows a thin yellow/green band at edge.
Fujinon FMT-SX 10x70 shows yellow green band at edge.
edz
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