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ASTRO: NGC 6888, The "Crescent Nebula" in Cygnus
This is one of my few images of the past months. It's a 10:10:15 minute
exposure with an STL-1301E thru an OGS 20-inch RC Cass working at around F/5. This image was taken at nearly full moon, so I suspect that is the cause of the weird blue corners - i.e., bright sky vignetting that was not completely processed out. The focal reducer lens was never intended for this use. For more info on the Crescent, see: http://www.kopernik.org/images/archive/n6888.htm George N |
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ASTRO: NGC 6888, The "Crescent Nebula" in Cygnus
George Normandin wrote: This is one of my few images of the past months. It's a 10:10:15 minute exposure with an STL-1301E thru an OGS 20-inch RC Cass working at around F/5. This image was taken at nearly full moon, so I suspect that is the cause of the weird blue corners - i.e., bright sky vignetting that was not completely processed out. The focal reducer lens was never intended for this use. For more info on the Crescent, see: http://www.kopernik.org/images/archive/n6888.htm George N I've been wondering what happened to you. Sounds like you have my clouds. They broke for a bit tonight then seeing went so far south I had to give up after an hour. Forecast isn't good. I make a trip to Lincoln for a few days later this week. At least it will be at full moon time but the forecast is for clear those days of course. I think the new telescope hex works for fixed cameras as well. I did this guy a couple months back in HaRGB but don't particularly like the result. Should try processing it again. Hard to get going with the weather we've been having. Typical for October so I shouldn't complain. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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ASTRO: NGC 6888, The "Crescent Nebula" in Cygnus
"Rick Johnson" wrote
George Normandin wrote: This is one of my few images of the past months......... .... I've been wondering what happened to you........ Rick, Well, out of the last 3 months I've been to two major star parties, a weekend trip to Cherry Springs State Park in PA (which is a star party *every* weekend - about 100 people on dark weekends - with lots of big Dobs and CCD rigs), and 16 days at my camp in the Adirondacks. Nearly all of that's been visual observing and at places with no phone service, let alone internet connections! The attached pic shows my friend Art (left) and I with my Obsession 20 at Cherry Springs. Note the nice concrete pad the scope is on. There's AC power about 5 feet to my left, and running water on the field. They're building flush toilets and hopefully a visitors center and planetarium on the other side of the road. Camping is only $4 per night ($20 to rent one of the empty domes). For their astronomy programs the PA Parks people get about 50 people on a clear night. They can walk the field after the formal program, but they're told not to touch people's scopes unless invited. The sky is really dark - Bortle scale 2 or so, the ground is flat and grassy, and the entire sky is visible because the field is on the top of a mountain. George N |
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