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Magnum

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Magnum last won the day on April 3 2019

Magnum had the most liked content!

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About Magnum

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    Proto Star

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    www.sekas.co.uk

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  1. Here is my 3rd and final pic from Monday nights wide field imaging test session. IC410 the tadpole Nebula and IC405 the flaming star nebula, really pleased with the field of view on this as its the perfect size to just capture both. 12 X 10 mins in Hydrogen Alpha with my Atik 460EX CCD & Altair Starwave ED70 refractor + Lightwave 0.6 reducer bringing it down to F3.6 @ 250mm FL. Guided, captured, stacked & stretched in MaximDL, processed in Photoshop. Lee
  2. For this one i used H(H/O)O, Ha for red, Oiii for blue then a mix of the two for green in ratio of 30:70. I always experiment with the ration for the green until i get it how i like, but its usually around 30:70. if i want a natural red look the i use straight HOO. In Maxim i use DDP for the initial stretch, i try to stretch them so the mid and black level is about the same in each, this usually means stretching the oiii more than the Ha. I just eyeball it until i think they look about the same level. then in photoshop I completely process each channel separately as if it they were both stand alone mono images. Next i combine the 2 to make the green channel, now i have 3 images to paste into the Final RGB, then use selective colour to fine tune the colors, normally only have to adjust the red channel with a tip Olly showed me. So seldt reds then move cyan slider to the left this will increase red/orange saturation the move the yellow slider to the right which pushes it into the golden shades.. Lee
  3. Yes bi colour can be combined in a lot of different ways, but seems to work better on some objects than others. I just did a bi colour M42 but not much colour variation at all, yet objects like the rossette seem to show a wealth of shades from just the 2 filters. thanks for the info on the Herbig Haro object, i recently captured another one of those in my Pelican nebula image. Lee
  4. Second target of 3 from last nights wide field test with my ED70mm refractor reduced to f3.6 with the Lightwave 0.6 reducer. Horsehead Nebula. This 9 X 10 mins in Ha with the Atik 460CCD. it had a tad of coma in the corners with the 12.5mm x 10mm sensor but reduced it as much as I can with selective star reduction. so I think it would also work good with the Hypercam 183, as thats similar size sensor. Guided, captured, stacked & stretched in MaximDL, combined and processed in Photoshop. Lee
  5. I did , tried 3 different distances, ended up going with 45mm instead of 55mm think it was better but lost a bit of reduction so more like 0.7x I think. it only really notices in bottom left corner so may be a little tilt. But im really pushing it to its limits as its designed for smaller sensors like the 314, but im still pretty happy with it. Lee
  6. Thanks for all the great comments, ive posted a lot of images over the years but never got such generous comments before so I must have done something right on this one cheers Lee
  7. This is a test of the combination of my Atik460 CCD to see how it works with my ED70 refractor with extreme 0.6 focal reducer, ive used this reducer with my old smaller CCD with good results, but was expecting some coma on the corner stars with the larger sensor, but after some selective star shrinking in the corners it doesn't really notice. 8 X 10 mins in Ha with the Altair Starwave 70ED + Lightwave 0.6 reducer giving a very fast F3.6 at 250mm Focal Length in combination with my Atik460CCD. This image contains The Bubble Nebula, M52 Open Cluster, The Lobster Claw Nebula and the small bright nebula at bottom right is NGC7538. Overall im pretty happy with this setup, though I cant help wish I could use my other larger 383CCD to get a bit wider still. May need to make another purchase :-p.Guided, captured, stacked & stretched in MaximDL, combined and processed in Photoshop. Lee
  8. https://www.scientificamerican.com/article/the-fccs-approval-of-spacexs-starlink-mega-constellation-may-have-been-unlawful/
  9. Rossette Bok Globules with Leaping Puma now in Colour. I started this on Dec 10th and finished on Friday night. 4 x 15 mins in Ha + 6 X 10 Mins in Oiii, captured with my Atik 460EX CCD & Meade 127mm F7.5 triplet refractor. Guided, captured, stacked & stretched in MaximDL, combined and processed in Photoshop.
  10. whoops LOL, I think I posted it too late at night
  11. Rossette Bok Globules with Leaping Puma now in Colour. I started this on Dec 10th and finished on Friday night. 4 x 15 mins in Ha + 6 X 10 Mins in Oiii, captured with my Atik 460EX CCD & Meade 127mm F7.5 triplet refractor. Guided, captured, stacked & stretched in MaximDL, combined and processed in Photoshop.
  12. Deep dive on the Orion Nebula last night. This is 2hrs of data in Hydrogen Alpha comprising of 12 X 10 min + 30 x 30 secs to recover the core, with my Atik383 CCD & 102mm triplet at f5.5. I have stretched it to the noise limit to get as deep as possible, maybe at the expense of smoothness but I quite like it. Guided, captured, stacked and stretched in MaximDL, processed in Photoshop, No Darks or Flats, Only Bias . Not sure why but I notice when I post on here the dark parts of the image get very grainy, doesn't happen on FB which is opposite to what I would expect. oh well
  13. Lovely and sharp with plenty of detail Dave. Lee
  14. Olly, was reading on another site that Bias frames can sometimes be affected by ambient temperature, in regards to the rest of the electronics on the board rather than the CCD itself. So maybe worth doing a new set of bias for when its very warm or cold. I was just trying your method of using Bias as darks with my recently purchased Atik383 and it indeed gives an identical result to using darks. even the ADU counts came in identical. I then tried just using Bias as Bias and the result was identical again. so not sure if I will us e bias as darks or just do bias as bias I can't see a difference either way. So for me Bias and dithering is definitely the way to go for my lazy style of imaging. Lee
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