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pietervdv

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Everything posted by pietervdv

  1. Hello everyone, I'd like to share a work in progress of a deep exposure of the supernova remnant NGC6992 in Cygnus. It's made up from two panels each exposed for 10 hours, so 20 hours so far with 30 min subexposures. Data was captured over 8 different nights during the past few weeks. In a couple of weeks I will be at a dark site to hopefully add another 20 hours of OIII, for a bicolour image. This is just a fast process, the plan is to process it more in depth when all the data has been collected. Just levels / curves and panels stitched in PS, no PI tricks ... Tech stuff: Scope: self built 10" f/3.8 astrograph with 3" Wynne corrector Mount: Mesu 200 Sitech CCD: sbig st8300 @-14°c with Astrodon 5nm h-alpha filter Guiding: homemade OAG with Lodestar (5 s guide intervals) Small size: http://www.astronomie.be/pieter.vandevelde/deepsky/HA_20hours_v2_smal.jpg Med size: http://www.astronomie.be/pieter.vandevelde/deepsky/HA_20hours_v2_med.jpg Hope you like the progress so far, thanks for taking a look! Regards, Pieter
  2. I have my doubts if a pure HA layer is a good base for an RGB image. I think it should be built up from a deep Luminance shot and the HA should only be very selectively mixed in the red & L channel. Mixing narrowband and broadband data is very tricky... But, it is a nice image in any case! Pieter
  3. Great shot! My favourite piece of the nightsky.
  4. Not sure if they are present in the other narrowband channels; but I will soon find out since I have an O3 filter on order. Pieter
  5. Thanks! The diffraction spikes will show intermittent as only the reds are captured. But the additional "beads" in the diffraction spikes are indeed caused by the custom spider. These extra "pearls" only show up in h-alpha. Pieter
  6. Hello everyone, Taking advantage of a nice stretch of clear nights the past 2 weeks, I managed to make another mosaic. This was the second mosaic I had on my "Cygnus bucket list" for 2015. I never thought the data acquisition would come together so quick. Probably a lesser known part next to the ic1318 complex, LBN241 with the embedded starcluster NGC6910. The whole area is very attractive in h-alpha and it is tempting to keep mosaicing in all directions . The view is made up from 3 vertical panels, clocking in at 19 hours total exposure time. Captured over 6 (white) nights. Capture and autofocus was automated with Sequence Generator Pro while I was sleeping. I tried to keep the post-processing to an absolute minimum (+/- 30 min). No sharpening, no noise reduction or fancy PI tricks, PS was used for stretching and contrast boost + mosaic assembly. Tech stuff: Scope: self built 10" f/3.8 astrograph with 3" Wynne corrector Mount: Mesu 200 Sitech CCD: sbig st8300 @-18°c with Astrodon 5nm h-alpha filter (20 minute subexposures) Guiding: homemade OAG with Lodestar (5 s guide intervals) Small: http://www.astronomie.be/pieter.vandevelde/deepsky/LBN241_final_smal.jpg Med: http://www.astronomie.be/pieter.vandevelde/deepsky/LBN241_final_med.jpg The full size image is 22 Megapixels. Thanks for taking a look, I hope you like it! Pieter
  7. Hello folks, This is a project I started last year with some frames taken of Barnard 344. I extended the view with 2 more panels. A lot of interesting stuff going on in this vista, often overlooked with the Butterfly Nebula being so close by... Total exposure was 15.5 hours in a three panel mosaic acquired over 5 different nights in 2014 & 2015. Equipment: 10" f/3.8 astrograph with 3" Wynne corrector sbig st-8300 CCD with Astrodon 5nm h-alpha filter (15min subexposures) Mount: Mesu 200 Sitech Small res: http://www.astronomie.be/pieter.vandevelde/deepsky/LDN889_small.jpg Med res: http://www.astronomie.be/pieter.vandevelde/deepsky/LDN889_med.jpg Full res (big, nearly 20 Megapixel): http://www.astronomie.be/pieter.vandevelde/deepsky/LDN889_full.jpg Hope you like it! Thanks for checking it out. Regards, Pieter
  8. Nice data, but I would take it easy with the noise reduction. Some small grain noise in the brown clouds looks more natural.
  9. Thank you! No colour coming soon, I gave up colour imaging 6 months ago. I prefer the aesthetics in b&w for conv. photography & astrophotography. Regards, Pieter
  10. Hello all, Last weekend I imaged M13 in Hercules. It was almost exactly 11 years ago since I first imaged this object with a ccd camera, one of my first images. The exposure was 3.5 hours (40 x 5 min + 20 x 30s) with a Baader L filter. Scope: 10" f/3.8 Newton with sbig st8300 ccd. Guided with custom oag and Lodestar. Very minimal processing (+/-15 min), levels / curves, gradient removal in PS. After tweaking several nights with a ccd detilter and a new mirrorholder, this is the first image after the scope upgrade. Hope you like it! Med res: http://www.astronomie.be/pieter.vandevelde/deepsky/M13_2015_med.jpg Full res: http://www.astronomie.be/pieter.vandevelde/deepsky/M13_2015.jpg For reference, this was the old version from 11 years ago, taken with a C8 and an SX MX7C ccd. Still remember taken this one below very well... Hopefully some progress is visible? Larger res: http://www.astronomie.be/pieter.vandevelde/deepsky/M13%2017-05-04%2010x25.jpg Thanks for checking & Regards Pieter
  11. Nice image, but you have a slight green colourcast around the galaxies. Try running HLVG in Photoshop. That should clean it up right away. Regards, Pieter
  12. Looks like something went wrong with the dark frame subtraction?
  13. Very Nice. Hope to be able to see a full size print of it. Looks like you need to fix some red hotpixels. Must be monumentale task to clone stamp those out! Pieter
  14. Great start! I am amazed the vixen can hold it. Did you try some longer subexposures yet? Pieter
  15. Very nice "american style" image! Indeed a great patch in Cygnus. The dark lanes leading into ic1318 (to the right of this field) are also very attractive. I imaged the same area last year and will work on a mosaic around it when it comes up again. Pieter
  16. Great shot! Maybe hold back a bit on the noise reduction? A little grain in the background gives a more natural feel. But that is just personal taste I guess... Good work. Pieter
  17. To come back on Olly point about blocky stars... That is indeed the only issue with the Epsilon. This is caused by the huge thick vaned secondary spider. You see it in the OO astrographs aswell. A custom DIY double vaned spider from 0.5 mm sheetmetal should fix this, if you are up for such a teardown/rebuild. Regards, Pieter
  18. I would go for the Epsilon. It covers a FF sensor which I am nor sure a reduced fsq 85 will ? Collimation is tricky on an Epsilon, but once you have it nailed very stable. There is just something very special about images taken with an Epsilon. It is the incredible sharpness and the signature star spikes. And besides, refractors are easy, why not go for something different?
  19. Hello, Your PHD2 setting look pretty good. I made a screendump of my settings, you can check them below. With this I get sub pixel guiding at 950mm each time. Another very important thing to check in the settings of the encoders in the SiTech config file: Are the encoders configured as "Polite"? If not the mount will try to compensate any mount adjustments made during guiding. Best regards, Pieter
  20. If the scaling on your graph is correct, a 2 arcsec RMS guiding error is not acceptable for a mount like this. I usually get lower than 0.5 arc sec with my Mesu. What guide algorithm are you using in PHD2? You should use hysteresis mode for both RA and DEC. It is important not to use the "resist switch" mode in declination. That does not work on a friction mount (no backlash). Set your guide exposures to 5 sec to cancel out the seeing. For a Newtonian I would also strongly advise to use an off axis guider. You might want to check with Lucas what kind of version RA motor you have, mine had to be replaced because of poor tracking. Hope this helps, Good luck, Pieter
  21. Landmark piece of astrophotography! This result blows away all Orion widefields out there. Congratulations Olly & Tom! Pieter
  22. Thanks everyone. Hopefully I can add some side and bottom panels. Regards, Pieter
  23. Hello everyone, Perhaps not the most original target, but I always had a soft spot for this object. I imaged the object for the first time in h-alpha 10 years ago and try to improve my version of it every 2 years. It consist of a 2 panel mosaic taken with a 10" f/3.8 Newton. Each pane was exposed for 3 hours with 15 min subexposures. The camera was a sbig st-8300 with an Astrodon 5nm h-alpha filter. Only processing was levels & curves + a small high pass filter in PS, no noise reduction used. Be sure to check out the larger res versions on below links: med res: http://www.astronomie.be/pieter.vandevelde/deepsky/rosette%202015%20mosaic%20med.jpg Full res: http://www.astronomie.be/pieter.vandevelde/deepsky/rosette%202015%20mosaic.jpg Thanks for checking it out and clear skies! Pieter
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