Jump to content



  • Content Count

  • Joined

  • Last visited

Community Reputation

24 Excellent

About GarethA

  • Rank
    Star Forming

Profile Information

  • Gender
  • Location
    North Dorset
  1. Win XP for the 'astronomy laptop' because everything for controlling cameras/mounts/etc only really works on windows (phd guiding, camera drivers, CdC, DSS + other astro software). This machine has networking disabled, updates switched off and just *works*. For everything else in life (including image processing in gimp) I use linux.
  2. that last process looked a bit extreme so here's one last one I'm done Next step - more data!
  3. I moved from sony to canon and have a spare sony T ring in the drawer - so if you decide to go down that route PM me before you buy one i used it with an a210 and a580
  4. Thanks folks - ok so I now know what dithering is I don't use capture software yet - just have the intervalometer clicking away. After a bit of investigation: It's not the camera. Here is a hyper stretched sub which does show some faint HORIZONTAL banding but my bias frames seem to deal that pretty well. I pulled the temp data and there's hardly any difference between subs. Sub length could have done with being a little longer. The various DSS methods don't seem to have any impact - (though now I've discovered kappa sigma by previously discarded subs with plane/satellite trails are now back
  5. I think folks are right that the best way is to go to an event and try both. I have a 130mm truss dob with a 24mm ep in that my 8 and 10 yr olds can lift out the garage onto the drive, turn on the rdf, point it at something, sit on an upturned bucket and be observing in <1min...
  6. Cheers Stuart - I hope it's not the camera or I'll have to break open the 'CCD Piggybank' earlier than I was planning to Am home tomorrow so will try the various DSS clipping and dithering techniques that have been described. Appreciate the compliment re the image itself - just wish the stripes would go away
  7. Cheers Peter, yep, I have an exif tool and will pull the temp data and have a look - hadn't really considered it before.
  8. good luck! Let us know how you get on. Also bear in mind that the primary is factory aligned/set-up . Get your secondary spot on and take some images to review - unless you're absolutely sure your primary is out it might be best just to leave it. Adjusting the primary is a fiddly old job requiring microscopic turns of the allen keys!
  9. I have 25 decent lights. I can't see the issue on individual subs (even super-stretched). I'll post one of the subs when i get home but i cant detect the issue. When i stack the lights (with no other calib frames) then the problem is visible on the stacked image before any stretching or post processing.
  10. i cant see the issue on single subs - looks like dss is introducing it. The camera was modded professionally and I haven't cleaned it so I dont think it's a camera issue...
  11. and I had the focal reducer in so was running at F7.2 which isnt the slowest ever! was hoping 5 min subs would be a good length...
  12. Maybe 5mins was a it short... though m51 isnt exactly dim, certainly brighter than m101. I can see the lines on the stacked image even before I stretch it...
  13. Thanks Louise / James that's a good point. I only had 5 seconds between subs so maybe the temp did start to build... Though I tried just taking the first 5 subs and stacking them and i still got the issue so I'm pretty sure my issue isn't temperature related.
  14. thanks peter - no, the subs were all taken in the same 2 hour slot between about 2230 and 0030 so not much temp difference
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.