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With a 12" scope you will have plenty of light for most objects and then could go to single eye viewing for the fainter objects. I was out for a LONG time last night and this morning my observing eye felt like a disaster zone, a bit dried out. The main draw back with the bino viewer is that you have to buy twice the eyepieces and if you are into good eyepieces that can get really expensive.
You could try the eyepatch (I have lost mine) and make sure you blink lots to stop the drying out feeling.
Cheers
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