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About alacant

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    Brown Dwarf

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  1. strange coma

    Hi. Almost certainly, see the diagrams in Demomperormer's post. If I'm too far away, the coma is orthogonal to the centre. Mine is toward the centre... 44mm Canon, 9mm OAG =53mm. Oh, and it's only on bright stars... --- --- --- **Just found the gpu blurb. It seems it's focal length dependent rather than f ratio. I'm at 1250mm:
  2. Astro Photo fail.

    Hi. The back of the camera needs to be 50cm from the telescope lens. Best to lose the diagonals, set the focuser around say 2cm out from its minimum travel and then use extension tubes to get you around the correct distance. The focus should now be close enough to get sharp. This -without an eyepiece- will probably do it. HTH.
  3. strange coma

    Hi everyone. I'm trying to diagnose the tails on the edge of frame stars. The stars seem quite well defined, but have tails. I think it's coma as it's pointing toward centre frame but not like the coma I'm used to. My next move is to move the cc away from the sensor, but any other diagnoses most gratefully received. Cheers and TIA. f5 Newtonian with gpu cc @ 53mm to 700d.
  4. Hi. Indeed. Trying to be fair to all: Believers, disbelievers and the OP. Cheers and clear skies.
  5. Hi. Exactly the same no matter which telescope is used. It's called the f-ratio myth. The 2 metre telescope at La Palma is f10. That's slower than an ed80 at f7? HTH
  6. No, I'm afraid not. The only way the OP could speed up the optics would be to move to a bigger aperture;) HTH
  7. ...and succeeded. Well done! I'd rate colour as the most difficult step in processing. I found that working with a reference -a starting point say from an image you know to be balanced correctly- on screen with which to compare prevents you getting it wildly wrong. Having said that, an image search for m44 throws up all manner of colour schemes ranging from all blue, all white and all yellow with a rainbow of alternatives in between. As i say, difficult if not impossible! Clear skies and good luck.
  8. Hi. Lovely telescope for galaxies:) The reducer will make no difference to the length of time you need to capture the image, just make the field of view wider which is probably not a good idea for galaxies on view at this time of year as they are all very small. Perhaps the main challenge you'll face is guiding at such a long focal length. HTH, good luck and clear skies.
  9. Hi. I don't think it's any bigger or smaller than any other 150 f8 Newtonian is it? The aluminium tube keeps the rigidity up and the weight down. It balances fine on an eq6 and guides up to 5 minutes, beyond which you need an oag. Cheers and good luck with it:)
  10. My 130 P-DS and a hacksaw?

    Hi. I took 15mm. Remove the focuser, tape a line and cut. Blutak the nuts to the tube for easy replacement of the focuser. 20 minutes:) HTH.
  11. Dss problems

    Hi. Here is the 3.3.4 unpacked file. Download it and double tap on it. That's it. HTH.
  12. Hi. Travel light? There's sure to be someone who can help you with gear whilst you're there. If the waiter in the local bar doesn't know anyone, he'll know someone who does. Failing that, the lady who runs the bakery knows everything about everyone within a generous radius, including the amount of money her clients' husbands have spent on telescopes over the past 10 years! You could also message sma in Málaga. HTH
  13. Imaging with the 130pds

    Hi everyone. It was nice getting back to the sw130 having been working with a sw250p for the up and coming galaxies. It also shows how stable it is; wind -even gentle gusts- are enough to ruin frames in the 250 whereas the 130 is barely affected. Clusters in the wind: m44 ngc2281 m46-m47 Thanks for looking and clear skies.
  14. Hi. Do you have a coma corrector? There is -I think- astigmatism. The reflection is not correct for your telescope. It may help if you centred the secondary both in the tube and in the focuser first and then tweaked the primary using a star. Make sure it remains dead centre of the field of view. HTH.
  15. Guidescope mount

    Hi. I really do hope this works for you because I failed miserably in my attempt at its eradication at 1200mm. Unfortunately it's rife everywhere. Tube, focuser, angle of mount, heavy secondary, that bit where the dovetail meets the tube rings... Everywhere! In the end, my only way out was an off axis guider. Cheers, good luck and clear skies.