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Everything posted by DKNicholson

  1. It is difficult to know which comments are causing confusion, but I'll take a few guesses! (1) A 'dob' is short for Dobsonian and in basic concept it is of a similar type of telescope to the Celestron PS1000 - they are reflectors. Dobsonians normally sit in a wooden 'cradle' that sits on the floor, whereas Newtonians normally sit on a 'mount' on a tripod. They are both known as reflectors because the light comes in through the open front and goes down to a curved (concave) mirror which reflects the light back up the tube to another very small mirror set at 45 degrees. This one redirects
  2. OK - here we have my latest and greatest observatory set-up! The red signature 'scope is a William Optics GTF81 that has spent the last 3 years in my garage doing nothing. Then last night I had an epiphany - why not add it to the Altair Wave Series 115 and put the TS-50 guide 'scope on top of it! That way I can utilise the GTF81 without having to dismantle and store the 115 - I just have to swap the camera and filter wheel over! It has taken so long to think of this as the mount is now an SW EQ6-R Pro, up from an HEQ5 Pro Synscan, and until recently I have been using an SW ST80 for
  3. I know that it's never nice to spend money if there's a cheaper alternative, but under the circumstances I should be inclined to bite the bullet and buy something like a QHY5-II that has been specifically designed for the purpose of guiding. It will also probably be quite a bit more sensitive enabling greater probability of finding a suitable guide star. Just a thought.
  4. Imaged over three evenings but only just over eight hours integration (weather . . . !) with Flats and BIAS frames added. Taken using my spangly new Starlight Xpress Trius Pro SX694 CCD camera. Telescope: Altair Wave Series 115mm - Camera: As above - Filter Wheel: Starlight Xpress SX-USB - Filters: Baader Ha, SII, OIII - Guided by: SX Lodestar x2 on a TS-50mm - Mount: SW EQ6-R Pro - Capture Software: SGPro with PHD2 and Platesolve2 - Process Software: DSS, Nebulosity V4, Photoshop CS3
  5. From the album: D K Nicholson

    Taken using Starlight Xpress Trius Pro SX694 through Altair Wave Series 115mm telescope.
  6. DKNicholson

    D K Nicholson

    Images taken over ten years or so - so far! Until 31st October 2019 all the DSOs were taken using an Atik 314L+ camera through various telescopes. Planetary - when added - will have all been take using a ZWO ASI120MC througha Meade LX90-8".
  7. I have this thing for Saturn and I have many videos I've taken over the years. This image is the result of one I took in July this year that I hadn't taken much time to process. It is 20% of 2,000 frames taken on a ZWO ASI120MC through my Meade LX90-8".
  8. Thought I'd try something a little different - NGC7129 - Reflection Nebula and NGC7142 - Open Cluster. LRGB about an hour of each, but the nebulosity was surprisingly faint so took a fair bit of difficult processing. Telescope: Altair Wave Series 115mm (very highly recommended - nice Christmas present! BTW - I have no business interest, I just really like the telescope!) Camera: Starlight Xpress Trius Pro 694 Guiding: Lodestar x2 through TS-50mm Mount: SkyWatcher EQ6-R
  9. Using a 2" Antares x1.6 Barlow into a 1.25" filterwheel then camera, curiously led to noticeable vignetting where I had hoped it would help avoid it. So whether the vignetting was a result of that particular Barlow or just an inevitable result of using a Barlow, I don't know, but it is perhaps something to watch out for.
  10. Have you checked how far past the meridian your system will go before it attacks the pier? If it is more than 20 minutes or so then try setting the meridian flip for as late after the Meridian as is reasonable. There is also a setting in PHD2 to reverse the guide camera after the flip though I have never found the need to tick that as it seems to do it automatically. I wish you luck as this sort of error can be so frustrating. Yours aye . . .
  11. Copernicus through Meade LX90-8" onto a ZWO ASI120MC using Sharpcap. 20% of 3,000 frames processed using Autostakkert-3, Registax-6 and Photoshop CS3.
  12. This may be a useful article - http://www.wilmslowastro.com/tips/autoguiding.htm and also this calculator - https://astronomy.tools/calculators/guidescope_suitability
  13. The main issue I encountered was quite severe vignetting even with the 2in Barlow through 1.25in filters onto the small chip of the Atik. Using the Trius I think it would not be acceptable at all. When I can be bothered to mount it I have a Meade LX90-8" for very small DSOs, but I'll do with the 115 for a while until I get used to the camera.
  14. There were quite a number of issues with this image. The dust bunnies on the camera screen obscured some of the subtle detail - for some reason I had failed to clean the screen before installing. As a consequence the flats struggled. Also I have been using an Atik 314L+ for the last 8 years so I have yet to become used-to the requirements of this camera - it's very different. The integration time was not only too short but also affected by high, thin cloud for much of the time, so DSS showed that some of the frames were not of the best quality. Altogether it was quite frustrating as I have
  15. This is the first object I've been able to image using my nice new camera - Starlight Xpress Trius Pro 694. It's not ideal and I plainly have a few things to learn before I can get the best from it, but I'm not too unhappy with this as a starting point! The total integration was just 4hrs 35mins, and with the weather we've been having I was lucky to manage that! DSO: NGC7023 - The Iris Nebula Telescope: Altair Wave Series 115mm Camera: Starlight Xpress Trius Pro 694 Filter Wheel: Starlight Xpress with Baader LRGB filters Guide Telescope: SW ST80 Guide
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