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Found 5 results

  1. This is a thread for those whose subs rarely if ever exceed 2 minutes long, often shorter, with relatively low total exposure time to discuss tips and techniques for image processing. Whether your an Alt-Az imager battling field rotation, you have issues with polar alignment or you have a relatively small, unguided mount you will often be faced with the challenge of getting the most out of relatively sparse data. The No-EQ Challenge thread has shown that even twenty minutes of sub-minute exposures can give good results. I think some of the things we could discuss are: We can't get rid of noise, but how can we keep its effects under control What are the best tools for short exposure images and what settings are best? Different types of software and their pros and cons What percentage of subs should we stack? (e.g. can we use a greater proportion of subs to reduce noise while letting sigma delta keep our stars round?) Ways of boosting faint background detail What sort of standard should we be aiming for And anything else
  2. Perhaps DIYers will be interested in a low cost guiding setup for EQ2 mounts. I'm not sure if this approach has been tried before, but it's relatively straightforward to implement and is certainly low cost. In early 2016 I purchased a Meade Polaris 130 scope, complete with EQ2 mount and Economy RA (clockwork) motor drive with the intention of trying out astrophotography at a low entry cost. Very quickly the prime focus problem arose - so the scope was shortened by 40mm. With this mod 30 second exposures very not too difficult, with 60 seconds sometimes successful. Of course the problem was tracking. Rather than spend time taking lots of 30 second exposures and knowing that longer exposures were really the way forward, I decided to investigate the Economy RA Motor to see if it could be modified in some way for guiding. The answer soon became apparent - yes it could (with very simple mods) but I had no idea how well it would work. Next steps were to look for a way to guide the motor - an Orion mini guide scope and Microsoft Cinema webcam (modified of course) plus a Raspberry PI with Lin_guider were relatively painless to get going and the results were good. However, DEC drift could still cause star trails, so a bit of thought came up with the idea of using an Economy RA Motor as a DEC motor, again to be controlled by the Raspberry PI. This evening the setup was given its for test for dual axis guiding (5 min RA guiding had been successful previously). Not the best sky - very bright due to the moon and clouds appearing. Still, taking no time for polar alignment other than to point the scope slightly to one side of the pole star, a guide star was found, guiding started, guiding gain etc adjusted and a couple of images taken before the clouds got in the way. Results - no doubt as seasoned astrophotographers would expect, DEC guiding just needs a bit of correcting from time to time - the gain of Lin_guider had to be brought down to stop oscillation. RA guiding takes much more frequent corrections, again with a low gain for my setup. My aim with the mods was to see if such a low cost and basic setup could be made to guide - also at a low cost and with simple equipment/mods. On the face of things it is not too involved and I hope that it will be useful to those who don't want to jump into the expense of more mainstream equipment. It could also be a low cost learning curve into guided astrophotography for those who have already purchased a scope with EQ2 mount. Next steps for me is to find (hopefully!) some clear skies for a chance at decent imaging. Weight hasn't been added to the mount as yet - this should improve stability although the short 650mm focal length is a help when it comes to stability and guiding errors. Below is a 5 minute (bright) single image taken this evening with dual axis guiding (at 100 ASA due to the moon). The central star seems reasonably round, though coma affects other stars towards the edge of the image. I've also attached diagrams of the setup and another earlier 5 minute single image taken with RA only guiding.
  3. Hi guys, I have a chance to buy Lidl style Bresser refractor on this particular EQ mount. Does anybody here know exactly what mount it is? Do any of you any experience attaching a simple EQ2 motor drive to it? See below. It seems very sturdy compared to EQ2 so I'm tempted. I know there are probably not the same mounting holes on the Bresser EQ as there are on EQ2, but my hope is that the R/A gear and worm might be of similar size (and ratio) to EQ2, so that the speed of EQ2 motor drive rotation could accomodate it. If so, a little bit of DIYing might be enough. Any thoughts? Thank you very much.
  4. Hi there, Recenly I have finally figured out how to attach my Prestigio webcam to a telescope properly and tried my very first planetary imaging. For the following set of images, I used my 12" dobsonian, because my 4.5" can't collect enough light for me insensitive webcam, so tracking was a no-no. What do you think?
  5. Hi guys, It has been a while since I last visited this forum and thought it is a great shame. A while ago, I figured how to properly attach my Prestigio webcam to a telescope using spare part from Hyperion Zoom and got around to get myself some motor drive for my 4.5" newtonian on a EQ2 mount. With somehwat limited tracking capabilities, I was finally able to get down to some wannabe serious imaging, and my first stop was the Moon last night, although the seeing was terrible. I just wanted to share my results with you, recieve some feedback and tips from you in the community. Setup and imaging details: 114/900 on EQ2, basic motor drive (focusing was a nightmare) Prestigio PWC2, most basic 2x Barlow Registax, ACDSee 6 Pro Range of resolutions/fps/exposures So, what do you think?
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