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Uranium235

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Uranium235 last won the day on November 14 2017

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About Uranium235

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  1. Ive been sitting on this data since last weekend, havent been feeling so great this week (baaad insomnia) which kinda took the wind out of my sails (unable to concentrate/think/operate normally). But today hasnt been so bad, so my clarity of thought has improved enough for me to process it properly with flats/bias. Thankfully, after a bit of tinkering and very patient focusing - Ive got this working at f4 with corners that are more acceptable (to me).... hurrah! 14x900 (Astrodon Ha) Askar ACL200, NEQ6, QSI683 Thanks for looking!
  2. Hmmm... imaging at sub arc-second has shown up a guiding issue with the 130 tonight. Might be time to find a different place to mount the finderguider (perhaps in the middle of the dual saddle, between the scopes).
  3. yay.... a clear slot! A bit mushy, but its better than nowt i suppose
  4. this is why my filters are kept fanatically clean the only motes I cant get to are on the sensor window itself (which is usually hidden behind a shutter).
  5. How clean are your filters? Because theoretically, you can use any flat from another filter (try L) to correct the red channel (as long as all your filters were clean when you took the images) - try it
  6. I got the gear out, fiddled for a while (getting both scopes pointing at the same thing)... and.... the sky turns to mush... fantastic... not! I'll leave it out for a bit, in case the band of cloud passes and leaves a clear spot - but I wont run it past midnight if its not going to clear up properly.
  7. Thats a depressing amount of satellite trails =/ and its only going to get worse
  8. Belt n' braces approach is best for CMOS ive found (well the ASI178 anyway). Darks, Dark flats, Bias, Flats I even match the setpoint cooling for all calibration frames (yes, for flats as well so you get a correct ADU measurement as hot pixels skew the readings)
  9. You have to realise that LDN targets are usually quite difficult and require a lot of exposure and/or very fast optics. But, I can see the dark stuff in your image - you just need to calibrate and flatten the background correctly in order for you to process it properly. Remember... youre looking for black, in the blackness of space, so you need to have plenty of exposure so the dust has something to "stand out" against. LBN are the same, sometimes theyre Ha, but other times its just faint dust illuminated by nearby stars (L) - witch head nebula is an example. And it can be all but impossible from your average back garden location (even with a CCD).
  10. Looks pretty good, Ive pixel peeped it and towards the top of the frame is where its still not quite right - might just need a bit more spacing on the CC (depending on which you have). But remember, you are on the very edge of what is possible with this telesope now... the last 5% is always the hardest. Ive been experimenting with my 130 last night, and looking into the effect of masking the primary mirror down by one stop (to 110mm) to increase the size of the (initial) coma free field.... but slightly altering the spacing on the SWCC to increase the reduction factor so no actual photographic speed is lost. Logic being, if the field has less coma in the first place - then the corrector "should" be more forgiving on the spacing as youre not asking it to correct the usual amout of coma. This is only to see if it affects the very far corners (usually just one corner) of my images, where it starts to fall off. If a small gain can be found, it might be worth it. If it refuses to work well enough with the SWCC, I'll go back to the Baader and see what happens. Could go horribly wrong, but if you dont ask - you dont get!
  11. Leave it switched off and create calibration frames at another time (but taking care to re-create the ambient temperature conditions if poss), as you dont really want the camera processor messing too much with your data. Advantage of this method is that you now have a library of calibration files (at different settings) you can use over and over again.
  12. I believe they might be probably best to ask them.
  13. Well... its been a while But, after some initial fiddling and a couple of nights that were actually clear - I now have the first "proper" image from this lens/telescope hybrid. Currently, I have the lens stopped down to f5 while I investigate a couple of things. Havent properly tried a mosaic with it yet either, that will be its true test of flatness. Askar ACL200 @f5, QSI683, Astrodon Ha
  14. Ok, I've had a couple of decent clear nights so I can post the first "proper" image from it. However, I must confess I had to stop the lens down to f5 in order to clear up some of the corner troubles on the KAF8300 sensor (22mm diagonal). 25x600s - QSI683 - Astrodon Ha
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