Search the Community
Showing results for tags 'nan'.
Found 6 results
I thought i'd revisit this one, as i was never truly sure abut the processing originally. So with this one, i sought to improve the stars (they're a big improvement) but also bring out more of the dark nebulosity. Did i go too far though?! Looking at it again today i think i may have. Details: Ha: 7 x 480s, 6 x 1200, 13 x 1200 (a little over 7 Hrs) OIII: 9 x 1200s (3 Hrs) RGB (with IDAS-D1 filter): 20 x 60s The usual Flats & Bias, stacked in APP and processed in PS. Gear used: Nikon D5300 (modded); SW 80ED (522mm FL); HEQ5-Pro; SGPro and PHD2. The original version can be seen on the Astrobin link. C&C welcome and clear skies folks! ps - At the moment this is still at 100%, but i'll probably end up down-sampling it to about 50%. I don't think it can hold up to 100% tbh. Edit - Here's the new, now much more toned-down, version. It's a clear improvement, so i'll have to keep reminding myself not to try and go for big & bright, when subdued nearly always ends up looking better! Original, nasty over-bright version: https://astrob.in/346428/C/
The sky cleared right up tonight and a nice relaxing sky cruise was had, no difficult targets were chosen. Sometimes looking at the same object(s) over and over helps certain features stand out and tonight a really nice star cluster, NGC 6997 grabbed my attention every time the 15" dob was swung on the North American nebula. The UHC gave a fantastic view of this cluster buried in the grey glow of the nebula riveting my attention. Thinking things were pretty good sky wise I popped up to the Scorpion and one of the Claws was contrasted nicely and the Bubble nebula was "bright" with a bit of small subtle structure. Pickerings Wisp released its twisted structure tonight along with that dark hole in the middle of the triangle- the 20mm Lunt HDC/Lumicon OIII work very well together on these objects. For some reason though I was going back to the NAN and its nice set of stars in that cluster...strange, I've seen it so many times. The UHC did a great job tonight showing many stars and the nebulae. A quick blast over the Stephans Quintet satisfied my curiosity as to if it was still there-its still there
Target- NAN area,transparency 4/5, darkness 21.7 mag/arc sec and using the VX10/Lumicon OIII/21E/30ES 82. Dark adaptation took about 10 minutes and the first observation of the Veil confirmed the sky conditions. The North American nebula complex has been very rewarding so far giving up many features this early season. Tonight the mini Gulf and Great Lake(s) showed well and some billowing structure shone up through the Gulf area to the other side of the neb. A delicate smattering of stars identified as NGC 6997. Using rolling averted vision made many of these stars pop in and out of view for a dazzling spectacle of this cluster. The dark nebs just off the mini Gulf also gave a great presentation as did SH2-119. My prize however was LBN 365, a nice faint target in the region and just south and over a bit from Xi Cygni. I caught a glimpse of a shadow in this area and went back to it repeatedly to confirm it for the evening. Actually I consider this a VG catch for the night! Gerry
Hey-ho So then, just as i thought the DSO season was well and truly over for me until late August/early September, as it turned out last Saturday night (May 5th) was mostly clear, so i set about trying to finish the NAN image i had captured in Ha a while back (see thread below): So all i needed was some OIII. It's obviously not the ideal time of year to capture this i know, as it's so low on the horizon, but beggar's can't be choosers so i tried my best to make the most of the small amount of astro dark time available and just make the best of it. In the end i managed 9 subs, two of which were sub-standard due to passing clouds, but as is my want these days i still asked APP to stack them (using the Quality setting) and it didn't seem to affect things. So in total this is: Ha: 7 x 480s, 6 x 1200, 13 x 1200 (a little over 7 Hrs) OIII: 9 x 1200s (3 Hrs) RGB (with IDAS-D1 filter): 20 x 60s The usual Flats & Bias, stacked in APP and processed in PS. Gear used: Nikon D5300 (modded); SW 80ED (510mm FL); HEQ5-Pro; SGPro and PHD2. The RGB subs were used solely for the stars. I still need to get better at merging them with the NB channels, i'm not as good as i'd like to be at controlling them. Although in this instance, i did mask the stretching of them, and it definitely helped, but i need to practice this to get better at it. I think the fact that the RGB stack (even at just 20 mins) contained some nebulosity didn't help things. When it's just stars and nothing else, it's so much simpler to combine them. So this is just a Version 1 for now (i'll try an sSHO next). I used Ha for Red, OIII for Blue, and used one of Carboni's Actions to synthesize the Green channel. Then went round and round in circles trying to find a colour balance to my liking (on my rubbish monitor!) so i'd love to hear what you guys think. Too dark? Too much saturation? (i tend to do that, lol). I also couldn't decide on orientation, so have included two different ones. Which do you guys prefer? All C&C welcome. Don't hold back! I'm always looking for ways to improve. Clear skies!
3 sets of rain showers today after last nights thunderstorm has cleaned the skies, very high transparency. First off I'll list the prize tonight, B352 and B353 near the NAN and seen with no filter- what a stark, black contrast those two "thumbprints" are!! I'm going to list some nebula that typically need filters but under good skies portions of them can be seen: NAN- Gulf section easy, with the rest a bit fainter, Pelican a faint glow Crescent neb- this is surprising really, a sharp, short streak can be seen near the "triangle" locator stars Veil neb- easy, both sections and even patches of the Wisp and the "claw" of the eastern Veil showed nicely OIII filter observing produced fine views tonight, IC 1318 was nicely contrasted and all those nebs listed above were amazing! The whole NGC 7000 area has nebulosity in it, it just never seems to end. After using images for maps- I have many- I now am confident that the neb on the "other" side of the Gulf is Sh2-119 and while faint is actually easy to see. I like warming up before getting serious to obs so after a good round on the Big Veil I went back over to the "little Veil" Sh2-91, now this is a good test of conditions and dark adaptation. The 10" dob pulled it in though for success on this very tough object system- I obs the portion labeled 01 on the map tonight. After obs this faint object my eyes were ready to go back to the bright NAN.... The scope set up used was the VX10 f4.8/Lumicon OIII/21mm,17mmEthos and the SQM-L gave up 21.8 under high transparency skies.
I'm back - into DSO imaging After a couple of years away due to the weather and other things I have myself a new imaging rig for widefield. Trying the new ZWO ASI1600MM-Cool CMOS camera in conjunction with Asahi Super Takumar 135mm f2.5 lens and Atik AFW2 filter wheel. EQ8 mount looking huge in comparison Friday night into Saturday morning gave me lovely clear sky for several hours and after a few very short trial runs I was able to grab my first decent imaging run for ages. All subs were 30s exposure with lens at full aperture, no guiding. Taken with Astrodon 5nm Ha filter. Software (still in Win7) was CdC plus EQMOD ASCOM for mount control and APT for image capture, followed by DSS and Photoshop for image processing. I captured 8 subs of the North American and Pelican Nebulae and 53 subs of the Cygnus Loop though DSS only chose 4 and 26 respectively in spite of much fiddling with the settings. Both stacks were cropped to the DSO area with the Cygnus Loop rotated to fit the screen better. Then these images were histogram stretched in Ps plus Enhance DSO & Reduce Stars and Space Reduce Noise applied to the Cygnus Loop. The images still being at least twice the maximum size allowed for posting here, size was reduced to 1200px in the biggest direction. Saved in PNG format.