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Veil nebula - West C34/Ced182a/NGC6960/LBN191/PGC3517684 and East C33/Ced182b/IC1340/NGC6992/NGC6995 (c-sho) two panel mosaicBy ramdom
Total integration: 960 minutes/16 hours (20+10 x 6m for S2 + 61+20 x 6m for Ha + 34+15 x 6m for O3).
Camera: QHY163M (16mp mono) CMOS cooled to -15 degrees C.
Telescope: Stellarvue SV70T triplet apochromat refractor @ f/4.8.
Mount: Paramount MyT.
Filters: Astrodon 5nm Ha, 3nm O3, 3nm S2.
Software: Sharpcap, PixInsight, Photoshop CC.
Inline image with reduced quality uploaded to forum. Full sized higher resolution image is here: http://ram.org/images/space/scope/220.127.116.11/veil_sho_20+10x360s_61+20x360s_34+15x360s.jpg
The Veil nebula and regions within located in the Cygnus constellation are known by many names, including Filamentary, Cirrus, Network, and Witch's Broom. This capture is my first attempt at creating a (two panel narrowband) mosaic and perhaps my last since after doing this I feel I should stick to my general philosophy of using the right sensor/reducer/OTA combination for the right target (though the North America nebula beckons and I don't see how I can get it to fit in a single panel unless I switch to using camera lenses). It was a PITA to get the brightness and noise levels of the panels matched up properly and also bring out the faint wispy details while imaging during moonlight though I learnt a lot about PixInsight doing this.
This was an interesting target for many reasons, beyond my two panel struggle. The Ha areas largely over encompass the O3 and S2 regions, but both of these also have very strong signal and if I had done an image excluding Ha it would've looked rather similar (except for the very faint bits prominent only in Ha. The S3 overlap is near 100% with the other two elements and if I hadn't brought down the Ha (which is still overwhelming) there would've been a lot of white as a result of the RGB combination. I chose to find a balance between choosing a post processing scheme that aesthetically looked good from afar while also showing the details of the filaments but the Ha only image really shows how intricate the filament work is. IMO, these narrowband images take a lot of artistic license and are best appreciated in comparison to the monochromatic signal from the individual filters, particularly Ha.
Other versions (Ha, darker background with more subtle processing, and basic SHO without HP tweaks) are here: https://www.astrobin.com/416486/B/ https://www.astrobin.com/416486/F https://www.astrobin.com/416486/G/
My plan is to repeat this with my OSC on the SV70T and by rotating the camera by 90 degrees I can get it to fit, which will a generate a colour image, and and then if possible I will create a merged SHO-RGB image by combining all of these captures.
As always, thanks for looking!
Canon 450D Modified for astrophotography, the IR cut filter has been removed for better response on red emission nebula in deep sky objects. Comes with battery, and charger. Shutter count is (atm) 5914, see picture 4. The camera is in great condition, throughout. No lens, just body. Will post special delivery. message me if you have any questions. Price is £150.
as the title suggests, I've noticed that the RA axis of my HEQ5 pro mount has some give. I don't notice it while the clutch is unlocked, but it's very obvious with a locked RA clutch. Any suggestions on what could be causing it/what adjustments need to be made?
I am wanting (not really 😪) to sell my Stellarvue SV105-3SV with tube rings [not shown in pictures]. The telescope is in great condition with very little dust and no scratches. There is one very small ding in the dew shield paint but it is not dented and it is almost not even noticeable. It happened when I took the telescope out of the saddle and it lightly hit the saddle. The telescope has never been dropped or had any issues and is optically perfect with a strehl of .95 or higher (claimed by Stellarvue).
I've only used this telescope for imaging however I've once or twice thrown an eyepiece in it during a star party or two and it's VERY crisp with no false color.
Currently I live in Italy so that's where it can be picked up or shipped from. Price is negotiable however Stellarvue says it is worth around $1200-$1500 USD. The nice thing is you wouldn't have any VAT from Stellarvue . Please let me know if you have any questions, comments or are interested.
Lastly, here is a link to some images that I've taken with it and what it looks like mounted up: https://www.astrobin.com/users/chriscorkill/
Aperture: 105mm Apochromatic Precision Triplet Focuser: 3" Dual Speed Focuser with 2" and 1.25" eye piece adapters F Ratio: f/7 Focal Length: 735mm Color Correction: Excellent Minimum Tube Length: 16" in travel mode Tube Diameter: ~ 4-1/8" (105mm) Dew Shield Diameter: ~ 5-3/8" (137mm) OTA Weight: ~12lbs (5.4kg) Retractable Dewshield: Yes
I have a question about filterwheels; SBIG filter wheels specifically. As far as I know they are the only ones that really use the 8 position filter wheels. So I have it loaded with L, R, G, B, Ha, OIII, and SII. So that is seven filters, what goes in the 8th slot???
Thank you for your insight,