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They are a great unit for the price, come with a nosepiece barlow and a pair of good quality 20mm eyepieces.
Downsides:
1) All binoviewers are *heavy* this can be a problem with some focusers.
2) Not all scopes will achieve focus with them in, some may require extension tubes.
3) You need two eyepieces! I got a pair of zooms which works well.
For the Moon, they are bloody fantastic, never want to view the moon any other way.
For DSO's, well they are always faint and fuzzy, I don't use them much for those. Planets, great.
For everything it means much longer viewing as the eye relief and brain relief from not using just one eye is really palpable.
They regularly sell second hand for only about 20% less than the new price, so not much risk there if you don't like them.
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