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  1. Hi, my advice - don't use 'exterior' ply - it varies a lot in quality and I have found that if it gets damp, e.g. with dew, eventually it will always delaminate. Its very difficult to seal the edges 100%. Marine ply, on the other hand rarely delaminates. It costs more but its worth it in the end. My current problem is that I can only get 6mm marine ply and nothing thinner for my observatory. Theo
  2. Can't you just use a bluetooth shield on an existing Arduino / or Rasperry Pi? There seem to be a lot of pico computers and dev boards about now. Maybe the market is a bit saturated..
  3. Just tried collodion on an old non-working webcam sensor and it took some of the bayer layer off, so maybe repeated applications would work... But I found the easiest way was just to scrape it off with an old fashioned flat razor blade. Seemed to work very well and didn't scratch the surface- its to small to get a pic of though. Theo
  4. There is a chance that Collodion could be used - paint it on then when dry it could lift off the layer. It can be hard to get hold of though. Will give it a go with an old webcam and let you know. Theo
  5. Thanks, and yes I do feel a mosaic coming on! Never tried one before. Maybe two more fields would do it...just. Theo
  6. Wow! Just looked it up, £800, that ASA is more expensive than my entire set up! Looks like it might be worth it though.. Theo
  7. Hi, great shots. What were the exposures and ISOs? Your camera looks really sensitive! Theo
  8. Hi, had my first session after the summer and went for an easy target. My mirror has gathered a few dust bunnies and so has the 350D by the looks of it.. but happy my mount still seems to be working, although the paving slabs under it tend to shift so I had a bit of new misalignment and rotation to deal with! Will have to sort that out. Damn those snails and spider eggs! Can anyone spot any supernovae? I couldn't. Theo Taken From North Yorkshire, UK 18/9/2012 300 mm f4 Newtonian Canon 350D, IR filter removed 60 x 1' ISO1600 Processed in Lynkeos and PSCS2
  9. Have indeed seen these. But they keep putting back the release date, been delayed for ages! When they do come out there is going to be a MAD rush for them. There is quite a buzz on the net about them because you can also use them as a TV/media PC. Theo
  10. Hi, if you are replacing it - don't use a reinforcer ring or similar. My new Orion Optics UK 12" mirror came with one of those, and the first time any dew formed on it and ran down the mirror (which ok I shouldn't have let happen, but it often can) it left a trail of glue residue across the surface. If I were marking a mirror I would use a good quality permanent marker (e.g. Sharpie) and mark a 2-3mm spot at the exact centre (which you can cut in the paper template as above). If you are laser collimating, it will still reflect fine off the marker spot. BTW, marking the primary anywhere from the centre out to the diameter of the secondary will have no effect because it is in the secondary's shadow. It does not reflect any light. Theo
  11. Added a video: http://www.flickr.com/photos/67062011@N02/6762034057/
  12. The asteroid is close.. the galaxy is very far away.
  13. Hi Luke, thanks very much for the detective work. I've never got to grips with Carte du Ciel, maybe I should try again. Really interesting - I suppose the name implies it wasn't discovered until 1991? I'm pleased to have detected such a faint object. Of course, I was secretly hoping it would be an undiscovered NEO! Thanks again, Theo
  14. Hi, on 23rd January I was imaging NGC2905. There is the track of a very faint object just to the top left of the galaxy (see close up pic). Can anyone identify it? I only have Stellarium and it is too dim for that software. The track started at the left of the stack which was captured from 22:00 to 23:52 on 23/01/2012. I'm in the process of making a movie, which is harder than it should be on my mac! Thanks for any help, Theo P.S. its not a processing artifact, it is a point source which moves in each frame. I'm asssuming its an asteroid? Taken form Wharram le Street, North Yorkshire, 23/1/2012 300 mm f4 Newtonian Canon 350D, IR filter removed 90 x 1' ISO1600 Processed in Lynkeos and PSCS2 Close up showing unknown object
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