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#1
June 22nd 09, 12:55 AM
posted to alt.binaries.pictures.astro
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ASTRO: First light, AP155EDF f/7 and PL39000C, target M8/M20
I have been attempting to use the '155 f/7 with the PL39K for three weeks
now. The faster focal ratio, f/7 versus the f/9 of the '180edt, means nearly a 2x improvement in light gathering rate with a modest increase in image scale: 1.15 versus 0.87 "/pixel. Finally the weather cooperated on Saturday night. I took 4.75 hours of exposure on Sat night using 15 minute subexposures. the full 39 megapixel resolution on the linked page below is interesting: there are a lot of stars in there! http://www.narrowbandimaging.com/m8_...pl39K_page.htm 
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