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-ChoJin- last won the day on March 14 2018

-ChoJin- had the most liked content!

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About -ChoJin-

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  1. thank you very much for all your kinds words. regarding the intensity of the blue and the core, I have to admit I tend to like very high contrasted photograph but the other issue I have is that I dont have yet a color calibration device. I'm therefore working with an uncalibrated monitor on my (very old) macbook pro. Hopefully what you're seeing isn't too far from what I intended though... I just ordered a print on alu dibond (I've read it was a good medium for astrophoto because of the deep black and matte finish), I'll see how the colors look like... And maybe I'll invest in a color calibration device ;-) I also have to admit I didn't really have prior first-hand experience as a direct scope operator, but I really did my homework first. I tend to read *a lot*. I've read countless of tutorials, this forums, other forums etc. about guiding, software, pitfalls and everything I could find really prior to this. But overall, I think I also was quite lucky (beginner lucky day syndrome). That night wasn't too windy. The skywatcher quattro 10" is very heavy and bulky, I'm pretty sure it's going to be really tricky on windy nights. Also, I think I have to thanks the very very dark sky I had. To choose it I used google earth and a special astrophoto light pollution map for it. I then searched for the darkest area I could find in France and still car-accessible (i.e. not high up in the Alpes mountain). I zoomed in.. and I street-searched for a suitable area... So I guess we could say this is the darkest area in France ;-) Anyway, thank you very much for your kind words.
  2. Hello, This is my first astrophotography with my own scope (and first light for this scope). I've always been fascinated with this galaxy, and it was my childhood dream to capture it. It finally happened ;-) You'll find all the technical details on the description on flickr. Overall it's the first light of my skywatcher Quattro 250mm/1000mm f4, NEQ6, with an unmodded Canon 6D. Integration time: 1h59 Processed with PixInsight. link to flickr for the full resolution and description:
  3. I'm currently also processing M31 with PixInsight ^^ I don't have much experience, but it seems your photo could get some help from a deconvolution at the linear stage and some HDRMultiscaleTransform & LocalHistogramEqualization later on.
  4. this image is stunning and certainly deserves a good quality print.
  5. very nice indeed, how did you cool your canon dslr?
  6. It looks nice indeed. which softwares did you use for calibration/integration and post-processing? You said the airplane trail did not go away completely, does it mean you kept the subframes with airplane trails during integration, why? I'm guessing because you didn't have much subframes to begin with? (I just did my first light with my scope, and I'm trying to decide whether or not I should keep the few subframes which have airplane/sat trails too)
  7. the crescent nebula shows up very nicely
  8. The canon 6D has 6.55um pixels, so with the takahashi's focal length of 628mm, the resolution should be 2.15arcsec/pixel I also did a drizzle 2x2 during processing, which therefore virtually gives me a resolution of 1arcsec/pixel (if I understand the drizzle properly) but i have no clue what the seeing was that night. When you're saying "undersampling", which target resolution did you have in mind?
  9. Unfortunately this is not my rig, my grand cousin is directing the Island's astronomical observatory, I therefore had access to all their rigs (including the D=60cm bigass telescope ^^ ) while on vacations. This also had the benefit of having a very good polar alignment already ready for me. From this rig only the camera canon 6D was mine and the (post)processing too Unfortunately the weather at night wasn't good during my stay and when it was, the moon was full (that night included). that's why I shot this very bright star cluster instead of a nebula. My current rig is much more modest: it is a newtonian skywatcher quattro 10" f4 (1000mm) telescope with an NEQ6 goto mount and a orion starshoot guider (with the 50mm orion guide scope) but I have yet to use it for any imaging. I'm hoping to do a first astrophoto with it in the next few weeks if the weather and my schedule let me. Anyway, thanks a lot for all the kind words
  10. Hello, this is my first DSO, taken while on vacations at the Réunion french Island. Unfortunately I screwed up the ICC profile while exporting to flickr, so the core has a little less details than what I have in PixInsight. I'll be more careful next time. - Taken with a Takahashi Epsilon 210mm/628mm on an Astrophysics 900 and a Canon 6D (unmodified) - Total integration time 10min: 10x60s lights RGB @ ISO 800, 10x60s darks, 11 flats, 10 bias - Processed with PixInsight you can see the full frame here (where you have a few faint galaxy, such as NGC 5064, top right, but there are a few others):
  11. Hello again, I've made a 2nd version :-) Using the first version as a starting point, I used a starmap to generate a mask and apply a median transform and morphological operators to remove some of the overwhelming tiny stars. The result was then bent back with the image using PixMath to bring up some details in the nebulosity and back some stars.Now I guess I should redo the whole workflow to do these steps earlier in the process. It should enable better noise reduction/control in the final image. That will be for v3 :-) Let me know what you think (to me it looks better, I hope you agree) Milky Way v2 by -ChoJin-, on Flickr
  12. Thanks :-) And no, it's not modded, I wouldn't dare modding my almost brand new Canon 6D ^^ (I use it for normal photography anyway) I have my now-retired Canon 300D I could mod, but I'm not sure it would be worth it given the low light noise performance of the 300D (that camera is 12 years old, first consumer DSLR! :-) ). I'll probably just buy a dedicated CCD camera for the telescope I just bought when I'll have the budget (I even didn't have time for a first light with it yet). In the meantime, I'll just use the 6D as-is. There are billions of stuff I need to learn/practice first anyway (good polar alignment, phd guiding, post-processing...) :-)
  13. thank you very much for the feedbacks. I also prefer corner to corner, and in fact I tried with a set like that first (as you can see on my flickr album) with photoshop but that was an epic fail and I got sick of this image staring at it for hours, and therefore wanted to experiment on another set (and you're right, that's andromeda, it's more obvious in some other sets I have) I actually shot every set with two exposure settings (iso3200 and iso800), not knowing what would give the better result noise-wise. I'll give the iso800 set a try then. But even with 3200, I think I'm far from a ETTR exposure since I was using the on-camera histogram, which is apparently completely off. Next time I'll copy the exposure test shot to the computer for proper analysis instead on relying on the on-camera histogram. I should get better noise results that way, even though the Canon 6D is quite low noise. I'm also wondering whether or not I should smooth/"denoise" the image to get smoother "nebula feel"... I'm undecided. The current "gazillon stars look" looks fine from a distance, but isn't so pleasing in full screen... Do you think it would look better? I'm currently experimenting with the TVGDenoise algorithm from PixInsight, but it's tricky to choose the parameters to remove the noise while keeping a sharp image at the same time. Thanks again!
  14. Hello, this is my first astrophotography ever, hence I started with the milky way. I used a Canon 6D with a Samyang 24mm f1.4 lens. 16 lights and 16 darks (no flats, and it shows on the photo imho), 21s @ ISO3200 (no tracking obviously :-) ). Stacked with DSS and post-processed with PixInsight (that i'm learning slowly) Unfortunately I didn't have any interesting foreground to put in frame, we therefore don't get a very dramatic FOV from the 24mm. But otherwise, for a first, I'm happy I got some different colours, especially considering I've read somewhere that the winter milky way is less photogenic/more boring than during may-summer. If anyone has time to give me some feedbacks, that'd be very nice :-) (and please ignore my other milky way photo on my flickr, that was a disastrous post-processing attempt with photoshop. I'm planning on re-doing it with DSS/PixInsight...) Anyway, here it is: Milky Way by -ChoJin-, on Flickr
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