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EdZ
Professor EdZ
Reged: 02/15/02
Posts: 12599
Loc: Cumberland, R I , USA42N71.4W
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Re: William Optics 7x50 ED binocular minireview
11/20/05 06:18 AM
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Again I tested CA last night and this morning. None of the stars or the planets, Mars, Saturn or Jupietr is bright enough to cause any CA. So, once again I turned to the moon. I also had my Fujinon FMT-SX 16x70 out with me so first I checked those. With the moon at the right edge of the field, I could easily see a blue band on the full sunlit edge of the moon (towards the center of the binocular). With the moon near the left side of the view, I could easily see a broad yellow band on the full sunlit edge of the moon towards the outer edge of the field of view. No false color is seen on the terminator edge of the moon.
In the WO ED 7x50, with the moon at the right side of my fov, if I tilt my head and look right at it I could not see any band of color. If I kept both my eyes right up against the eyepieces and scanned right by moving just my eyes, I could see a partial blue band sometimes appear. It did not span the entire sunlit edge of the moon, maybe only 1/3 of the edge.
(edit) I was able to produce a thin yellow band when doing the same thing with my eyes to observe the moon at the left edge of my view. Once again, the band did not span the full extent of the sunlit edge of the moon. It seemed to be only about 1/4 to 1/3 the length. It would quickly disappear as I moved my eyes around.
(added)I aslo checked my Garrett Optical 20x80 triplet. With the moon at the right edge of the field, there was a yellow or red band on the full sunlit edge of the moon (towards the center of the binocular). With the moon near the left side of the view, I could easily see a thin green band on the full sunlit edge of the moon towards the outer edge of the field of view. On-axis I could see alternately a blue band or yellow band, depending on how my eyes were positioned at the moment. No false color is seen on the terminator edge of the moon.
So, with some work, I was just barely able to produce a little false color in the WO 7x50 ED. It would not stay there. When I tilted my head even slightly to look right at the moon in the outer edge of the field, the slight blue would quikly disappear.
edz
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Teach a kid something today. The feeling you'll get is one of life's greatest rewards.
member#21
Edited by EdZ (11/21/05 06:00 AM)
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