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alacant last won the day on April 5

alacant had the most liked content!

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About alacant

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  1. Hi. I've an opticstar ar80 f5. It's very well made and has well corrected optics (example here). If that is anything to go by, the f7.5 should be even better but with not such a wide field of view. My recommendation would be your 80mm choice. HTH
  2. alacant


    Hi everyone. I'm hoping someone will be able to shed some light (sorry) on those annoying halos. This is a Newtonian reflector. Could this be the cc I wonder? Didn't have time to test without but then again, if I did, there'd be something else to complain about. TIA and thanks for looking.
  3. alacant

    Imaging with the 130pds

    Hi. 35mm. HTH.
  4. alacant

    IC 1795

    Hi everyone. New moon and clear skies so we got an opportunity for something vague and watery. Thanks for looking and any/all comments and suggestions for improvements most gratefully received. canon 700d: 2 hours @ ISO800
  5. alacant

    Skywatcher 200PDS

    Hi. I didn't, until I read the myths that is. Before that I made a mess of collimation by adjusting the focuser. Yes. The central screw is used to adjust the secondary toward or away from the primary. Loosen the three adjusting screws first. Whilst you're there, centralise the spider by making all the vanes the same length. A pair of compasses or dividers makes this easier. HTH.
  6. alacant

    Skywatcher 200PDS

    Hi AFAIK they are for squaring the focuser -which you don't need to do- so I'd leave them and go through the collimation again. I find that if the secondary is too far up or down the tube, the camera sensor isn't evenly illuminated. Shouldn't be a problem if you have the primary OK so don't waste a clear night by fixing it! HTH and good luck.
  7. alacant


    Hi and thanks for your comment. Yes, Linux all the way; it's StarTools and Siril's debayer algorithm. Slowly coming to terms with the vocabulary:) Clear skies.
  8. alacant


    Hi everyone I used ahd debayering for this one. Absolutely no idea what it is but it makes me sound like I know what I'm talking about! Loadsa dots in the galaxy; globular clusters maybe? Thanks for looking and any comments and suggestions... All advice taken on board. canon 700d, 10" f4.7: 2 hours
  9. Hi. Focus on the moon, lock focus and then plate solve to centre your target. HTH. edit: your CLS idea is good.
  10. alacant

    ngc 457

    Hi everyone Overpowering moonlight last night so had to chose something bright. Slowly getting there with the colour; finally remembered to check the camera before fitting it to the telescope and removed the filter. Much easier to colour balance. A quick bash with Siril and StarTools y listo. Thanks for looking oh, and does anyone know why we get that -FWOABW- refractor-milkyness around the bright star? 700d on 250mm f4.7: ~an hour @ ISO800
  11. alacant

    Imaging with the 130pds

    You're making me feel guilty now! I focus once on a bright star at the start of the session and leave it there all night. Is expansion and contraction -that is what we're talking about I think (???)- enough to make a difference? Sorry, now I am off topic.... Cheers and clear skies anyway.
  12. alacant

    upgrade from ed80 to ?

    Hi. I gave up on my (my example had a hopeless focuser fat blue halo stars) 80ed for one of these and couldn't now go back. Not sure whether it would go with your camera, but if you want speed and image quality, then this has it:) HTH.
  13. alacant

    Callibration Disaster. (DSS)

    Try without the dark frame stack; light, bias and flat frames only work better with my 700d, especially if the light frames are dithered. HTH
  14. I can't find much nebulosity I'm afraid. Even StarTools' big hammer didn't work:( Still thinking... If no one else comes up with a solution.... Do it again, but this time with dark and flat frames, unity gain and say, 90s snaps? Cheers, good luck and clear skies.

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