Archived posting to the Leica Users Group, 2020/12/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi, Peter? The images are single exposures. Since posting them, I?ve learned how to stack multiple images of the same field to improve S/N and reduce color noise and granularity. It makes a huge difference! I?ve just posted <http://gallery.leica-users.org/v/hlritter/Nikon+Astro/?g2_fromNavId=x98ac3343> a stacked version of the same Orion field as well as a stack of frames taken through a narrower emission-line filter. The latter I think is my preference. http://gallery.leica-users.org/v/hlritter/Nikon+Astro/?g2_fromNavId=x98ac3343 <http://gallery.leica-users.org/v/hlritter/Nikon+Astro/?g2_fromNavId=x98ac3343> ?howard > On Dec20, 2020, at 1250, Peter Dzwig <pdzwig at summaventures.com> wrote: > > Howard, > > are those single shots, or did you stack them? The one of the Orion > nebula is particularly fine. > > Peter > > On 19/12/2020 21:38, Howard Ritter via LUG wrote: >> Congratulations, Douglas. A first astronomical telescope is a memorable >> and possibly fateful thing, potentially a trap as dangerous as a first >> camera. With me it went the other way: At about age 10, my parents got me >> an Edmund Scientific 3? reflector, and this was enough to launch me on a >> lifelong hobby. I got my hands on a camera at about the same age. It?s a >> tossup which hobby has consumed more of my time as well as money! The >> apex was a 25? Dobsonian (I?ve downsized to a mere 20? now, plus a 6? >> refractor and a pair of 100mm astronomical binoculars.) >> >> The Dobsonian format is the ideal one for a neophyte, and a 6? aperture >> will show you wonders. I recommend getting a guide to the Messier >> objects, of which many look great in 6? of aperture, as I know firsthand. >> And you won?t need to be told to point your scope at the Moon! Dobson was >> a creative genius and the patron saint of amateur observers around the >> world, a tireless advocate of astronomy on the cheap for the masses. >> >> Good luck with the weather next Monday. Ours in Florida looks >> unfavorable. Because of that, I took the time to get a picture of the >> pair last night, when they were still 4 times as far apart as they will >> be on the 21st. After moonset, be sure to have a look at the Northern >> Hemisphere?s deep-sky (as opposed to Moon and planets) showpiece, the >> Orion Nebula. If you don?t have dark surroundings, take a dark cloth or >> hoodie to shut out all extraneous light as you look at the nebula and so >> you can keep both eyes open while you look. Start with an eyepiece that >> will give you about 50x. >> >> I put my images of Jupiter and Saturn, as well as the Orion Nebula, on >> the Gallery here <http://gallery.leica-users.org/v/hlritter/Nikon+Astro/>. >> >> http://gallery.leica-users.org/v/hlritter/Nikon+Astro/ >> <http://gallery.leica-users.org/v/hlritter/Nikon+Astro/> >> >> ?howard >> >>> On Dec19, 2020, at 1326, Douglas Barry <imra at iol.ie> wrote: >>> >>> This is the telescope I got recently as a birthday present from my sons. >>> It works extremely well, even in light polluted suburbia. I haven't >>> taken it out to darker skies yet due to the pandemic. >>> >>> http://gallery.leica-users.org/v/DouglasBray/Sky+Quest+Dobsonian.jpg.html >>> >>> With the conjunction of Jupiter and Saturn coming up on Monday, I hope >>> it won't be too cloudy so that I can use this. It's pretty good for a 6 >>> inch, but with my back bothering me at the moment, I could with >>> lightening the Dobsonian base a bit without sacrificing stability. >>> Maturer years don't like heavy weights. >>> >>> By the way, if you would like some marvellously therapeutic viewing have >>> a look at the great John Dobson making a reflector telescope by hand, >>> including hand grinding and polishing the 16 inch mirror. >>> https://www.youtube.com/watch?v=snz7JJlSZvw >>> >>> Douglas >>> >>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > -- > > Dr. Peter Dzwig > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information