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About andrewluck

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    Star Forming

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    Member of Breckland Astronomical Society.
    Ex-RAF electronics engineer. Now a consultant with a computer system integrator.
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  1. It it with much regret that I have to announce Mike's passing on Friday 9th October 2020. This thread seemed an appropriate place to do it as he gave a status update on the completion of his observatory as well as indicating that he was unwell. Deepest sympathies to his friends and family. Clear skies Mike.
  2. If there's no flex then tightening the tension screws won't fix anything. That looks like a pretty big gap to me and I wonder if the black ring has been cross-threaded on the focuser tube. Andrew
  3. If you're using LRGB then generally you're time limited. The target also matters, it works best on bright objects with a lot of detail such as galaxies. Light pollution levels also have an impact. RGB filter sets usually have a gap in their pass bands that attenuates sodium sky glow. L filters will record this light pollution and generally you will have more work to do removing gradients from the L image. There will also be more shot noise so you need more exposures to drive this noise level down. I should have mentioned this on my original post as it's a another advantage to RGB imaging unde
  4. My preferred approach is to shoot the RGB frames at bin 1x1 and forget about luminance. In my view this has several advantages: Due to the reduced bandwidth of the filters, RGB images will tend to be sharper than L Any faint structures in the data are guaranteed to have matching chrominance information. This is not necessarily the case if you've gone deeper on the luminance As there is only one copy of the luminance data (derived from the RGB images) in the final stack colour saturation is easier to preserve The one downside is that you will be spending much more time col
  5. This is the area around Eta Carina acquired with 4x 20 minute Ha exposures. Some 5 minute exposures were used for the star cores but these were too long and also saturated (but to a lesser extent). With hind-sight 30 seconds would probably have been long enough for these. I've reduced the image to about half size. Equipment was the same as for my RCW114 image; FSQ106 with Moravian G3-16200. Images taken at Tivoli AstroFarm, Namibia.
  6. AP 1200GTO mount Takahashi FSQ106 Moravian G3-16200 Baader 4.5nM Ha
  7. An image from this year's trip to Namibia, it's a 2 panel Ha mosaic of the emission nebula RCW114 on the Scorpius / Ara border. 3 hours per panel in 20 minute sub frames. This image spans a 4x3 degree area of sky and includes two globular clusters NGC6388 & NGC6352.
  8. This image of the Lobster (Gum 66) in Scorpius is from 10x 20 minute Ha frames acquired over my last two visits to Tivoli in Namibia. The image has been resized to 60% of the original. Mount: AP GTO1200 Telescope: Takahashi FSQ-106 Camera: Moravian G3-16200 Filter: Baader 4.5nM Ha
  9. This is a two panel mosaic of Sh2-155 comprising a lot of 20 minute red, green and blue sub-frames for 28 hours total integration time. Taken with my FSQ-85 with 1.01x flattener and Moravian G3-16200. Processed in Pixinsight. Andrew
  10. No dispute there, you're absolutely correct. Finger trouble with the calculator here. Apologies for the confusion. Andrew
  11. From the specs on Takahashi America I see that the 130d has a 44mm image circle. The diagonal of a full frame sensor exceeds this at 49.5mm. I've no experience with this scope but with my FSQ-85 (same image circle specification), when I switched to a 16200 chipped camera the stars in the corners were very poor. This sensor is considerably smaller than a full frame. Now I've fitted the new flattener this has made a considerable difference. I'd seek the advise of either Takahashi Europe or America and see what they recommend. Andrew
  12. The flattener has now arrived and been installed. As I already had an adapter for the front of the filter wheel to connect to a CA-35 all I had to do was include some M54 extenders between the flattener and the adapter. The ones I used were these: https://www.aliexpress.com/store/product/A-set-of-M54-Extension-Tube-4-9MM/1371081_32819456658.html?spm=2114.12010612.8148356.4.73733ccaSiki3y Originally, I intended ordering a new custom adapter once I'd determined the back focus requirement but I don't think this is essential. The results are interesting. I was previously aware that these
  13. Hi Julian I haven't got a flattener yet but I'll be pressing the buy button very soon. I'll also need a new adapter to connect it to the filter wheel. <Edit> Button pressed. Also a set of M54 extenders </Edit> Andrew
  14. I use one of these: http://www.auroraeurotech.com/CloudSensor.php Works well with CCD Commander to open and close the roof. No wind speed measurement though. Andrew
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