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Found 7 results

  1. wimvb

    M37

    From the album: wvb_dso

    M37 17*60 secs exposures SW Explorer 150P on EQ3-2 mount Camera Pentax K20D Tracking was slightly off
  2. All Just had an hour with the 12x50 bins following AN magazines November binocular sky feature. Basicly a hunt for M's 36, 37 and 38. Found them fairly quickly Starting from Alnath to HIP25291. Just on the edge of the fov was M36 a sharpish fuzzie. Once located both M37 and M38 could both be located on the edge of fov above and below M36, both appearing as less distinct faint fuzzies. For all 3 M's i had to use averted vision Pleased as punch with that hour and 3 more M's chalked off and my first chance to scan Auriga. I also passed many rich star fields that i havent identified due to the initial hunt for M's
  3. Hi folks, Another reprocess of old data (from last December) to see if my skills have improved. Here's one which includes the Flaming Star nebula, rather deeper than my previous effort: Flaming Star - includes M36, M37, M38, IC 405, IC 410 and IC 417 The full sized 4096 pixel square version is available here (6 MB download) - beware, horrors may await the avid pixel peeper! The challenges for this one were to separate out the faint Ha from some residual sensor noise and to decide how many stars were enough - there were a lot more in the RGB subs. At the image scale offered by the 165mm focal length lens the reflection nebulosity was difficult to extract. I decided where it was by doing a blink comparison of the 1000 second blue stack with the full RGB image (the version with all the stars plus some nebulosity) and then it was a matter of isolating it from the bright stars that were illuminating it. It was added to the Photoshop stack of Ha (no stars) plus RGB (just stars) and the final challenge was deciding how strongly to show it - the reflection nebulosity should certainly be weaker but then it risks geting lost in the artificially strong Ha signal. Something that I didn't find in the original processing of the data last year is the "sugar cage" just creeping in at the bottom of the image at about six-thirty. Has anyone got a shot of the full object? Bob. Shooting Information: 8 x 1000 seconds exposures of Ha 5 x 200 seconds through each of Red, Green and Blue 3 x 1000 seconds through the Blue filter for reflection nebulosity Camera: FLI ML16803 cooled to -25°C. Lens: 165mm focal length f/2.8 Pentax medium format Pointing at: 5h 25m, +34° 30'
  4. This is my first image of 2017. 2 hours each of R, G and B captured on the nights of 1 and 2 January 2017:
  5. alan4908

    M37

    From the album: Deep Sky III

    I've begun to capture star clusters when it's inadvisable to image fainter objects due to moon light pollution. I also quite like them since they provide a very good basis for practicing star field processing, which I find quite challenging. For this open cluster I used 600s subs which caused my camera to enter its non-linear, whilst this did not create saturated stars it can distort colours. I therefore decided to use the Pixinsight script Repaired HSV separation which may be used to repair non-linear data - it attempts to put the correct colour back into the star cores by examination of the surrounding pixels. I also shot sum Lum data in order to create the "glowing" star effect that I like which to me also looks more natural. LIGHTS: L:5, R:10, G:9, B:8 x 600s. DARKS:30, FLATS:40, BIAS:100 all at -20C.
  6. alan4908

    M37

    Since I needed more practice at my star field processing, particularly with respect to star colour, I thought I'd have a go at M37. My default exposure duration is 600s subs which I find works well from my site and allows me to capture faint background objects. Unfortunately, for M37 I noticed that this length of exposure, whilst it does not create saturated stars, it does take my camera into the non-linear response region for some of the bright stars. A consequence is that star colours can become compromised. So, I thought this would be a good opportunity to try out the Pixinsight Repaired HSV separation script, which can be used to correct this non-linear effect. I also decided to shoot a small amount of Lum since I like the glowing effect it produces. Since I was interested in capturing quite faint objects in addition to containing the bright stars, I performed both a high and low strength DDP stretch of the Lum which I subsequently blended and then mixed with the RGB data. The result is below and represents just over 5 hours integration time. Alan LIGHTS: L:5, R:10, G:9, B:8 x 600s. DARKS:30, FLATS:40, BIAS:100 all at -20C.
  7. I grabbed the frames for this image on the night of the 5th Nov as a quick target after having got a lot more data on the Bubble. ST2000XM, with a WO FLT110 at f5.7 - R:G:B = 35:35:35 (5min subs) at 1x1. Processed in Pixinsight - it's tricky to hold the colour in the stars for these images - but really like the colour of the deep red carbon star V358 Aur (colour index ~1.57, V mag 12.something) in the lower portion of the image. Thanks for looking!
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