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Ken Mitchell

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  1. Thanks! 240sec subs. This is a single sub cropped. Stars are still a bit bloated because of the mod and I don't use any uv filters. Ken
  2. Thanks! I had a good PA, subs were very good at 240sec. Guiding was around 2", pretty good for the SA I've been doing some 'experiments' with phd2 to refine PA on the SA. As it doesn't guide in Dec there is usually some drift and the graph won't stay in the middle. This can be used to perfect your PA. When the red dec line falls to the bottom of the graph it means Polaris is too high on the polar scope hour circle. When it drifts to the top, Polaris is too low. From there on you can do some fine adjustments. Usually the red dec line disappears from the screen after +-10 (in my previous sessions) now it stayed in the middle for the whole session, around 3 hrs. I also just cleaned and re greased all the gears which might also play a roll. Ken
  3. Yes indeed, that triangle in the middle is the cone nebula You can also see the Hubble's Variable Nebula at the top right Ken
  4. My latest with the Star Adventurer. Never imaged this area before, interesting stuff up there. I'd wish I had a bigger scope to make some close ups. image and equipment info: Nikon d90(mod)TS72 APO + TS72flat settings: 432mm, f6, iso800, 360min guiding:ZWO asi120mcsTS 50mm guidescope Tracking: Skywatcher Star Adventurer software: guiding: phd2 Stacking: Deepskystacker 4.2.2 Processing: Adobe Photoshop CC, automated action set, GradientXterminator, Nik software, HLVG
  5. Her are my previous attempts with the same data. They are all slightly different framed or rotated, it as just the way I liked it back then. Ken 1st edit 2nd edit 3th edit
  6. When your post processing knowledge expand I find it interesting to go back to old images and see what results you can now pull off with that data. Decided to take on a 2018 image, the first time I imaged Andromeda with my new refractor back then. Processing went much faster and easier as before. This also might be the version which I prefer the most, I believe it's the fourth version so far. Every one had something to it but imo this has the most 'natural' look . Also in previous versions it was difficult to pull out the colors but with this edit all they 'appeared' during the stretching with very little need to use color boosting tools. I'll post the previous versions in the comment below if you want to see the 'progress'. The difference with this stack is that I used the drizzle function and custom rectangle in DSS, I thought it would be beneficial as my setup is slightly undersampled, any information on how and when to use drizzle is welcome. The most obvious error in the image here are the startrails, which is unfortunate, but as I said it was the first time on Andromeda with this scope and the fourth target with this scope. Didn't had everything figured out yet, max exposure time, balancing and such. Seeing these new results I'm waiting for Andromeda season again and take on that galaxy again, this time with guiding. Here are some details on image and equipment: - Nikon d610 stock TS72 APO + TS72flat settings: 432mm, f6, iso1600, 6.5hrs (60ec subs) - Tracking: Skywatcher Star Adventurer unguided software: Stacking: Deepskystacker 4.2.2 (drizzle2) Processing: Adobe Photoshop, several PS plugins and astro actions Ken
  7. Definitely worth it yes. You can also wait until May when the comet is at its brightest. Ken
  8. Thanks Dave! Yeah I was too excited about the comet so the processing went rather quickly Hope you get some good data. What equipment did you use? Ken
  9. No problem. I've never used the Walimex though, so you'll have to do some test for yourself to determine it's best f stop. I imagine there will be some differences but from what I've read it's a really good astro lens and many shoot wide open with it, even better :) Ken
  10. Just had a look at the raw and I stopped down to f4 and used iso 400 on the camera. At f1.8 the lens has some coma in the corners and a good amount of vignette. At f2.8 the coma is mostly removed but I'm not too happy with the amount of vignette. f4 did the trick for me. Ken
  11. Video of the individual frames captured that night comet tracking.mp4
  12. Hi all, My first capture of a comet and pretty exited about it! Definitely makes you think! Love to get back to this rock in couple months to get a composition with the H&S nebula and hopefully with a bit more brightness. Curious at how it will look then! This was just over two hours of imaging using the stock Nikon d610 and TS72 apo. Mounted and guided with the Star adventurer. The image is a blend of two stacks, one aligned for the stars and one for the comet. Stacking was done in DSS. Ken
  13. Hi all, For a long time I wanted to shoot this frame, probably from the early days of my astrophotography adventure. Finally after all these years I managed to get a decent result of the 'stuff' between these two beautiful nebulae. Fairly happy with the image but always looking for improvement. I hope one day to redo this all with a mono camera and filters. Apart from NGC1499 , M45 and the Baby Eagle Nebula no idea what else is in the picture. If you happen to have an idea feel free to educate me. Some info on image and capturing: Widefield Pleiades to California. Taken over 2 nights with a total of 11hrs 25min integration. With a stock Nikon d610 and Nikkor 85mm 1.8 objective. Tracking was done with the Skywatcher Star Adventurer. Lights and all calibrations frames were stacked in DSS. Processing was done in Adobe Photoshop CC using Adobe Raw, GradientXterminator plugin, HLVG plugin, Nik software plugins and Photokemi action set. Ken
  14. That's interesting, thatks. So the best one would be a 2.5x or should a regular 2x be ok? I found the Baader Hyperion 2.25x or the ES focal extender 2x(What Craig recommends) The 2.5x Powermate is just a bit high in price. Any thought on those? Ken
  15. Is there any advantage choosing the 2" before the 1.25"? Ken
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