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gorann

Lobster Claw Nebula HaOiii reprocess

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While waiting for clear skies (may happen Wednesday here, maybe) I have entertained myself with reprocessing data from the autumn. This is Ha (10 x 15 min) and Oiii (18 x 15 min) from my Esprit 150 with 0.79 x TS 3" reducer and ASI1600MM (gain 139, offset 50. -20°C). So totally 7 hours. I initially put Ha to red, Oiii to blue, and made a 50:50 mix of Ha and Oiii for the green channel. Then I tweaked the colours in PS towards an "RGB look". I endeavoured into doing a bit of HDRM and deconvolution in PI before I escaped back into my relative comfort zone, which is PS. Finally, I boosted the dust a bit by adding a few % of an Equalize layer in PS (a method suggested by Olly @ollypenricehere). I think the image shows a rather unusual amount of detail and I hope I have not over cooked it. Or have I?

Cheers, Göran

20190921 Sh2-157 PS45smallSign.jpg

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That's a feast for your eyes Göran. Personally I think it's over saturated. Tone it down slightly and see if looks better.

Steve

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56 minutes ago, sloz1664 said:

That's a feast for your eyes Göran. Personally I think it's over saturated. Tone it down slightly and see if looks better.

Steve

Thanks Steve! Yes, maybe you are right, and have been on and off about the level of saturation and it is easily adjusted in PS but I am not sure. My version before this one was even more saturated.... After all it is a NB image so everything is allowed. In any case, here is a less saturated version and yes it may be better.

20190921 Sh2-157 PS46smallSign.jpg

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    • By gorann
      The moon is up although not terribly bright any more. Still, it made me go for NB and for the first time use my Baader 8.5 nm Oiii filter that I bought years ago. I aimed at the Lobster Claw nebula in Cassiopeia. Grabbed 10 x 15 min of Oiii before the midnight meridean flip and 18 x 15 min Ha (Baader 3.5 nm filter) until the morning. I made a synthetic green by mixing Ha and Oiii 50:50. Then I tweeked the colours towards an RGB like palette. Registered and calibrated in PI and processed in PS.
      So far I have only used my equipment for RGB and Ha so this is the first time I process my own pure NB data (I have had a few goes at processing public NB data). A reason for this is that I got a nice dark sky so RGB is always more tempting. SQM was 21.1 yesterday even with the moon up.
      Equipment used: Esprit 150 + 0.79x 3" TS reducer + ASI1600MMpro. Guiding with ST80 and QHY5L-IIM.
      Any comments most appreciated. I am for example a bit unsure how much of the Ha in the surrounding sky I should let through. My first versions were quite reddish all over and I finally decided to tweak the curves to put more emphasis on the brighter parts of the image to make the claws stand out.
       
       

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