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I purchased a set of Andrews binoviewers just for occasional use on the moon, thinking that as long as I could merge the images these binos would be worth the $99 asking price.
Good Points:
An initial daytime test showed no merging problems in an 80mm f/5 refractor at 80x (19mm eyepieces, 2x ultima barlow). At night I tried them in my 8" f/6.3 sct with a 2" 2x barlow element screwed into the 1.25" adapter of the 2" diagonal, giving about 210x magnification; the image was not sharp due to the observing conditions but merging was easy. I tried loosening a set screw to tilt an eyepiece off centre and this produced a double image, but releasing the eyepiece immediately allowed the images to merge again.
Bad Points:
There are defects in the optical coatings, with 4 small spots where the coatings have not been properly applied. The eyepiece holders are a loose fit on my eyepieces and have only 1 set screw.
Overall I think these binoviewers are appropriately priced and were worth purchasing given that there are no merging issues.
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