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About Filroden

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    Proto Star
  • Birthday August 26

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  1. I don't know how well it would guide. It has a very long focal length and the mount is ok but not great... I will probably have to give it a go but there are still enough targets for me test the new combination of kit for at least a while. Along with the Flaming Star, I think I can also get the Soul and California at the moment, though both are nearing a street light so probably only good for Ha. I may have a go at the Leo triplets and the M95, 96 and 105 group.
  2. Yeah. I think if I were to try galaxies it would have to be M101 and M51 at the moment because of their size otherwise I'd need to break out the SCT. The good news is I took a look out of the window at 2am last night and Deneb was already on the rise in the Eastern sky, enough to begin imaging again. Give it a couple of months and the Iris, Elephant Trunk, Veil, NAN, Pelican, etc will all be back around
  3. Well, to break my promise, here's the final version which corrects the green background tint using BackgroundNeutralisation, adds some sharpening (Unsharp in PI and a Clarity boost in Lightroom), a contrast boost using LocalHistogramTransformation and an application of Noel's actions to the star colours.
  4. From the album My images

    Celestron AVX + Skywatcher Esprit 80 + ZWO ASI1600MM-C + ZWO RGB filters + Astrodon 3nm Ha filter 30x 120s Ha and 20x 60s each RGB Processed in PI, PS (colour) and Lightroom (final adjustments) v2.2: reprocessed RGB to apply another round of background extraction, using many large points, to remove the more complex gradients, particularly in the blue channel. Combined using the HaRGB combination script, putting 66% of Ha into R and 33% of R into Ha. Blended the resulting two images using lighten mode. v2.5: removed green tint from background (BackgroundNeutralisation), applied sharpening (Unsharp), contrast boost (LocalHistogramTransformation) and improved star core colours (Noel's actions)
  5. As you say, you're really pushing your scope to the limits on these small objected. With the small pixel size of the camera you're asking a lot! Nonetheless, that's the sort of swirl I like to see on my coffee Apply a lot of noise reduction and it would look like how I like my Guinness too! I assume this is a tight crop? Have you thought of doing wider shots in Leo and Virgo?
  6. You're starting to pull out some detail, so as Wim says...more data please You might want to take another look at your background removal. I think you still have a fairly heavy amount of light pollution affecting the image so it looks a little 'washed out' and you've lost too much in the upper left corner where it's almost gone to black. I think there is much more hiding in the image.
  7. These are the stand out feature for me. And in a blind taste test I'd have sworn this had Ha data. Amazing.
  8. Thank you Sara. It really isn't! I plugged in two leads, fiddled a little with the OAG to get a rough focus (and I do mean rough) and then pressed three icons in sequence. Job done, I was guiding.
  9. I don't think it's the data. You've captured an amazing amount of detail. Just look how tight the stars are, and the small clusters within the galaxy, and within the core itself. Have you tried blending the two images together, the one not so stretched and this one? You might find a happy medium between them? I think I have to come back to this thought. Had you not mentioned the softness I probably wouldn't have zoomed in to see it! I'd have just enjoyed the image for what it was - a great M51 with a bold saturation (which I love but I know is a matter of taste).
  10. Thank you Paddy. I still can't believe the huge difference guiding made to overall resolution. Now I just need another clear night to add the data needed to really bring out the dust between the two nebulae.
  11. Thank you. I couldn't have done it without all the support, advice and inspiration I get from here.
  12. To me, it looks like a great image It does look a little soft in the background; almost as if it's had a guassian blur applied with the detail protected. However, at screen size it looks amazing. I love the saturation.
  13. Your graphs use different scales. One is absolute and the other is relative, but gives no reference to what. Therefore without knowing the absolute QE at the peak around 500nm there is no way to compare the two chips without a controlled field test.
  14. Nice thought but it almost certainly won't pan out that way. CMOS is a more likely first or second step into imaging after DSLR. And if CMOS technology continues to advance (and it will because of the large amounts of R&D being invested into CMOS compared to CCD) then it's likely that anyone taking the step from CCD to CMOS is doing it because it offers them an improvement. And then, why would you buy the more expensive, used, inferior product? Pure speculation as CCD still rules the roost for astronomy but once CMOS QE and well depths improve...
  15. I'm not familiar with this one but it looks to be a lovely tight spiral. You can just see the arms so more time on the target would be worth it I think. Thank you for sharing.