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marcoverstraaten

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Everything posted by marcoverstraaten

  1. Captured with a Nikon D810a & a Takahashi FSQ106 ED. 10 Minute subs for the fainter details and 10 x 60 seconds subs for the core @ iso 800 from The Netherlands. Conditions were pretty good for 2 nights. PI & PS for processing.
  2. A couple of clear nights around new moon. That's a while ago! Suddenly both eyes are pointed upwards and this beautiful hobby fires up again (remember; 4 clear nights a month is sort of common in Holland)! Got 2 setups running for 3 nights so lot's of data to be processed. Details: 12inch Ritchey Chretien, operating at f5.5, 1600 mm. of focal length. QSI583WSG, SXV-AOL. Exposures: Halpha: 4h20m., red: 1h30m, green: 1h30m., blue: 2h., luminance: 2h., so over 11h total exposure time, during multiple nights. Red & halpha are mixed, with a touch of halpha in luminance too.
  3. In May this year, my wife and I went to Namibia to combine daytrips and astrophotography (hard combo with game drives in morning & evening & driving at daytime). Started out at Astrofarm Tivoli the first 4 nights with mostly cloudy weather , but after that, things went really well for stargazing! To get the most out of it, I rented a scope at Tivoli (only 1 object more or less finished) but I also brought a TS Star 71 APO (the perfect (only?) small scope for fullframe sensors), a Nikon D810a and a Vixen GP as a mount. So a really transportable setup. This picture was taken after we left Tivoli into the hot Namibian desert near Sossusvlei. It's a mosaic of two panels with the Star 71 Apo/ NIkon D810a combination. Total exposure is 150 minutes (only, I'ts hard to stick longer to one object when you live at 52 degrees north). 800 iso with subexposures of 10 minutes. Stitching is done by PTGui. The original file is 55 megapixel.
  4. Not so much for the core I think, but more so for the outer regions. But this is all I could take. Just 1,5 clear nights in 3 weeks. I did refuse to take shorter subs (I can fix that later, stupid me), so color and detail in the core was difficult to reproduce. All subs are 10 min. exposures. Actually, after 2 days, we had to leave this pretty site because of the unbearable heat. No pool, no airco, sun on the "stoep". The cabin was like an oven, not able to get rid of the build up heat at night. No problem for me being outside, but getting some sleep was hard.
  5. Preparing. The cabin is located in the Klein Karoo, Swartberg mountains, South Africa. Daytime temps were 43 degrees c. As you can see, we first had to finish a bottle of wine. No problemo! Good that SGP took care of it all....... (more alcohol abuse)
  6. Second (and last ) image: Omega Centauri. Beautiful big cluster! Difficult to process the core......
  7. The PC cable does work without issue. Using it with SGP to control my Vixen GP (synscan goto set+EQmod) fully automated!
  8. So we (newly weds) went to South Africa. Three weeks planned around new moon in the dark inland southern hemisphere. Awesome, what a trip! At night however, clouds were present almost every day, giving me only 1,5 night to use the brought along equipment. Bummer. A Takahashi FSQ85 in Pelican case as carry-on, Vixen SP in the suitcase and QSI583WSG camera where taken there for the shots. What an amazing skies! (compared to the Dutch yellowish starless sky) Anyway, I used SGP to do all the stuff automatically. All processing in Nebulosity & Photoshop.
  9. Superb Rob! So how is the main mirror hold down on its position? Just by the center baffle? Is this a commercial available upgrade kit or is it custom made?
  10. They discovered it. I didn't. I only went back to the images I took on the 18th after hearing about it. It's all in the game I guess. K. Itagaki, Yamagata, Japan found the nova on the images he/she took January 15. http://www.k-itagaki.jp/psn-m82.jpg There must be a lot more pictures taken before the 22nd.
  11. Captured this one on the 18th & therefore before the actual discovery! I was testing new software and wasn't paying attention on the object. For this image I combined 5x600 L frames with 1x 1800 5nm. Halpha.
  12. My first results after "taping" the rear cell (instead of the 3 tiny coark pieces placed by GSO. This is looking good!
  13. + There's no space to put in a decent mirror cell. Back to the drawing board to design a new backplate & mirror cell, that will do the trick.........
  14. Btw, I loosened all parts holding the mirror on its place after this. So clamps and center baffle are loose for the next test.
  15. Doug, it's a ring I made on my lathe. Mounted with bolts on the back, on the other end threads cut the size of the extension rings provided with the scope. So I can still use those. Moonlite has extension parts from there to match them to their focussers. Now, I got the scope apart again. As you can see, the triangular star shapes are a bit tilted. I ligned up my camera to match dec/ra movement, so this tilt looks a bit odd. You'd expect to have 2 "points" of the triangular star to be horizontal in the frame to match the position of the mirror clamps. The mirror support frame has six "vanes" (can't make up another word for that, sorry), but only three of those have a small piece of cork. An that's the only support the main mirror has !!!! The position of these 3 pieces of cork are rotated in relation to the line up of the collimation screws. Overtighting the center baffle or side clips should cause these triangular stars. I hope you can visualize what I mean....... A month earlier, super high end telescope & optics technician Hans Dekker tested my optics. They were fine after cutting the kit ( 3 positions on the side. before: astigmatism!! ). But the test was done horizontally. So, back home: triangular stars again...... AAAAARRRRGGGGHHH! Yesterday I removed the cork supporting the mirror and put some tape on more (measured) places to give the mirror more support. I know this is not the correct way to support a mirror, but at least I should see some change in star shape. To be tested! It is and was my goal to just use the optics and make a nice truss-design like I did wih the 10". So I can allways redesign a mirrorcell if necessary.
  16. And as far as checking axis alignment with focusser: I removed the secundary and taped a small mirror on top of the secondary mount cell. On the outside. So now I can check the alignment of the system with a laser. (goes through the center screw hole of the secundary and back bouncing on the placed mirror) Note: my focusser is seperated from the rear cell so this helps me adjusting the focusser.
  17. What an excellent thread this is for me! I pulled some hair out the last 2 months! Now I totally rebuild an 10" a couple of years ago allready, forcing me to dive into the RC collimation, and I totally got used with it. First option for me was to get rid of the faulty design of focusser & mirrorcell. So I did on the 10" & now on my 12". I have the same issues with the 12" with perfect collimation. This is the best a got so far: I haven't come up with your idea, so this opens up new possibilities! Thanks!
  18. As the "Great Andromeda Galaxy" is taking all the attention of most imagers, M110 allways will be it's small companion. And although M110 is quite large on it's self, it's bigger brother (sister?) will get the credits in this part of the sky. That's why I zoomed in a bit on this amazing galaxy. Nice to see the grain in this one!
  19. Time went by pretty fast after posting the halpha version of my Pacman picture. Very bad conditions here in Holland, so it took me a while to get enough subs to create a Hubble palet version. I've been able to capture 19 hours of data now and since there are no clear skies for a while now (& in near future) I had to finish this one. I already changed the filterwheel to a LRGB config, so no turning back. I forgot to mention that I used a Starlight Express SXV-AOL (=outstanding device!!!) to guide. Optics are standard GSO 10" RC. Hope you like it, cause it took some time to get this result!
  20. Thanks everyone! Yes it does! Maybe not so much on SII, but I sure wait for the perfect nights taking my OIII subs!
  21. I spent multiple nights on getting subs for a Hubble palet version, but clouds spoiled the party and left me with halpha subs only for this moment. The moon is rising so I have to wait to be able to collect more OIII (& SII). Can't wait to post the Hubble version! In total 3 hours (only, need more) of 5nm. filtered halpha subs, so it's still a bit noisy. With a 10 inch f8 RC and a QSI583WSG. Guiding with a SXV AOL with lodestar. Mount = Gemini G42+.
  22. Thanks everyone! Don't know, never been there! I guess you allways want to move boundaries.....
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