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rookie
sage
Reged: 01/14/06
Posts: 330
Loc: St. Petersburg, FL
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Re: binos and filters?
07/14/08 09:13 PM
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I use Agena 25% neutral density filters for observing the moon with my BT80. I asked Zach Garrett what was best, and that was his recommendation. (BTW nice guy) It's a good compliment with that aperture because it all but elimiates chromatic aberration and reduces glare. I considered using the polarizing filter as I already had one, but was afraid to try them. The polarizing filter is much wider and adds 9/16" to the base of the ep. I was afraid of scratching the prisms because of the extention into the housing. I never made any measurements, but I did scratch my WO 2" diagonal mirror on my telescope with a polarizing filter. That was a tough lesson.
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Shirley
Celestron CPC 800XLT~Feather Touch
G0 BT80~45degree; Fujinon 16x70 FMT-SX
Celestron Ultima 9x63 & Regal LX 10x42
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