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strutsinaction

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Everything posted by strutsinaction

  1. Patrick Gilliland's excellent M81/M82 image made an appearance. Congratulations, Paddy! Regards John
  2. Hi Paddy Congratulations! This magnificent image of M81/M82 appeared on The Sky at Night 60th Anniversary Special on BBC Four last night! Regards John
  3. Hi Andy How did you setup your PHD2 profile? Did you choose 'On Camera' from the Mount dropdown in PHD2? Regards John
  4. Hi Andy I use x0.2 and I agree x0.05 seems a tad low. Avalon support recommend the following:
  5. Yes, you need to login to get access to the support contents. I'm logged in now and see 2 versions of the StarGo software: Version 446 (Jun 17 2015) Version 523 F Beta (7 August 2016) The ReadMe for 523 Beta states: StarGo 5.2.3 version Installer What's new! - New X-Solver Polar Alignment tool - Alt-Az pointing performance improved - Southern emisphere pointing bug fixed - Minor bug fixed - New StarGo User Manual - Sequence Generator Pro: Meridian Flip issue fixed (5.2.3_D version) Watch the tutorials for a correct installation https://www.youtube.com/watch?v=aeMNqFJuC58 Regards John
  6. Cool! Now why didn't I think of that? I wonder if Luciano's new design is similar to that. How is that attached? Double-sided sticky tape?
  7. Pictures of my Avalon Linear Fast Reverse
  8. Hi Sara That's the adapter I purchased from Ian King and you do have to remove the handle to fit it. I mentioned this to Luciano who said he'd design an adapter so that the handle didn't have to be removed. I don't think it's available yet. Regards John
  9. Enjoy the new mount! I've had a Linear (with EQ6 controller rather than StarGo) for a while now and have had no issues. I also use it with SGPro. I'm portable so the carry handle is very useful. However, I recently purchased Polemaster and unfortunately the carry handle has to be removed to fit the adapter. I just have to take a little more care when carrying it now. Regards John
  10. Article now available here: http://diffractionlimited.com/flat-fields-stray-light-amateur-telescopes/ Regards John
  11. Tested the PoleMaster out on Saturday. Brilliant!
  12. An excellent guide and very timely for me! My PoleMaster arrived from ModernAstronomy earlier this week and an Avalon Linear adaptor plate from Ian King. I'm hoping to test this out this weekend. Regards John
  13. Another excellent image, Barry! This has your signature processing style all over it, akin to a Monet (unlike my own less subtle HST style, akin to Jackson Pollock ) Regards John
  14. Avalon Instruments now manufacture a Polemaster adapter for all models: http://www.avalon-instruments.com/products/polemaster-adapter Regards John
  15. Briiliant! Super capture and processing! And just in time for Halloween Regards John
  16. Understood. I use SGPro and platesolving which prompts me to rotate the camera until the orientation is correct (within a couple of degrees).
  17. Regarding the framing - are you able to rotate your camera? The Soul should easily fit within the diagonal. I did just that - rotated the camera to around 325 degrees and got the whole lot in along the diagonal.
  18. Looking good! Stars are a little blue so a star mask might help when playing with the Hubble palette. Also, the framing could be improved but probably a little late now! Regards John
  19. You can search the PI forums for Magenta Star Reduction or just do it using PixelMath. The formula I use is: R/K: $T[0] G: iif(min($T[0],$T[2])>$T[1],min($T[0],$T[2]),$T[1]) B: $T[2] You can use it with a star mask but it's not always necessary. Works really well! Regards John
  20. Hi Rodd Very nice! Version 2 for me. Maybe you could apply Magenta Star Reduction in PI? Regards John
  21. I've just been experimenting with my recent Soul Nebula NB image. I used the HistogramTransformation tool on the non-linear image to shift the red and blue channels to the left so that the image was largely green. I then applied SCNR with Average Neutral protection, Amount 1.00 and Preserve Lightness. The green image became more or less monochrome but all the details were still present. I then repeated this but with Preserve Lightness unchecked. This time the image was largely black. So, with Preserve Lightness unchecked, I believe that the following algorithm is being applied: m = (R + B)/2 i.e. mean value of R and BG' = min(G,m) Hence, the black image in my case, since R and B were very small. I'm not sure what algorithm is applied when Preserve Lightness is checked but it's now clear to me that the Ha data (green) is not suppressed, as Paddy indicated earlier and Barry successfully demonstrates with his wonderful NB images. So, I will no longer be afraid to use SCNR on my NB images! Regards John
  22. Wise words indeed! And you are correct regarding the Amount. My google search revealed a legacy version of the process where Amount was absent for Average Neutral Protection. I'd still like to understand what's going on though and the maths seem to suggest that in a NB image where there's a strong Ha component and very weak OIII/SII then the Ha would be suppressed: m = (R + B)/2 i.e. mean value of R and B G' = min(G,m) So, for example, if the non-linear R and B values for a particular pixel were 5000 and 10000 and the G value 20000 then the new G value will be 7500, so we have lost some of the Ha signal? Hopefully someone will be along shortly to clarify. In the mean time I need to 'trust my eyes and experiment' Regards John
  23. Further to this, for Average Neutral Protection, SCNR suppreses the green (in this case Ha) component as follows: m = (R + B)/2 i.e. mean value of R and B G' = min(G,m) The Amount value doesn't affect the outcome. So, to answer my own question, SCNR is ok to use with NB assuming the less aggressive protection modes are chosen. The mask protection modes are much more aggressive at removing the green component so would degrade the Ha signal significantly. I think I'll experiment!
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