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Merlin66

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Everything posted by Merlin66

  1. All CMOS chips cannot be hardware binned (like the CCD chips) The best you can do is to bin in software after acquisition.
  2. Florin, Drop me an email and I'll send you the PST mod document. Unfortunately nowadays the costs of all the necessary components is getting costly. I use a SM60 double stack on my ED80. Works well for me.
  3. If you Google Orion nebula spectra.... https://www.google.com/search?q=M42+spectra&tbm=isch&chips It shows the main emission lines and relative intensities. Typical spectra shown below (from Steve Broadbent)
  4. OK. Just make sure both programs use the same setting. J Now or J2000 (Due to the wobble in the Earth’s orbit the RA and Dec positions of the Stars appears to change. The older star atlases used Epoch 1950 for their positions, newer atlases use Epoch 2000.)
  5. Are both software using the same epoch? J2000?
  6. As Robin says...these cheap eBay gratings are very inefficient and really of no use in astronomical spectroscopy. Invest in a SA100 grating.
  7. Steve, You need to flip the spectrum. We standardise spectra processing with the blue wavelengths to the left. Very noisy. The major humps and bumps are probably due to the Bayer matrix filters on the camera. Where did you acquire the 500 l/mm (?) grating?
  8. I know some users have had “issues” with Teamviewer. I’ve used Teamviewer to link between my observatory laptop and my home office laptop for the past few years. I use a Cat5/6 cable about 25mtr long. No internet connection involved. Seems to work well for me.
  9. I use FireCapture to acquire my SER videos. It allows you to set any ROI, frame rate, etc. etc. http://www.firecapture.de/
  10. John, I use both the ASI 174MM (1936 x 1216, 5.86 micron) and the ASI 1600MM ( 4656 x 3520, 3.8 micron) USB3 cameras. With the ASI 174 I select an ROI (1936 x 120 ) to suit the target line and full height of the solar spectrum, for CaK would use an exposure around 0.6ms. I have achieved frame rates >>100fps, but to reduce the file sizes ( full frame, 3Gb (!!!), ROI 500 Mb) and maintain a reasonable resolution I currently set the frame rate to 60fps. Using x2 sidereal scanning rate, 21 sec for full disk scan, gives me 1400 frames in SER. One issue I do have with the CMOS cameras is resonance banding......
  11. If required, only for visual.... The CCD/CMOS cameras are not sensitive beyond 1100nm, in the NIR.
  12. https://www.ccdware.com/resources/ The calculator allows you to assess where the dust motes are sitting.......
  13. You're certainly trying very hard to accommodate the linear CCD array. I respect your decision and hope you find a workable solution. With "conventional" sensors used in the SHG, life is easier - the processing software can correct for tilt/ slant/ smile......
  14. I think this needs to be made a "sticky" The Canon DSLR filters: There are two built into the camera body: One, #2 filter, (blue tinted close to the chip) is a colour correction filter which suppresses the red response, to give a "better" colour balance. The other, #1 filter, is at the front and acts as a UV-IR cut filter as well as an "anti-alias" dust shake element. The "normal" Mod is to remove #2 filter to enhance the response to Ha wavelengths. A FULL spectral mod involves removing both filters to provide access across the UV to the NIR. (I use this type of mod for spectroscopy)
  15. This seems at odds with: Applicants are required to be a member of an affiliated organization, such as an astronomy club that belongs to the Astronomical League;
  16. The AAS seems to be restricted to US members? Many amateurs already submit data to various ProAm spectroscopic campaigns. Their work is recognized by the professionals.
  17. Here in Australia we can get some intense sunshine - followed by drought, fire and torrential rain. Luckily not all on the one day!
  18. The original PST had the ERF coating on the objective -a "gold" look. This failed pretty quickly, and was replaced under warranty by the "Blue" objective and an internal ITF at the eyepiece holder. I haven't seen any of the old "gold" objective PST for a while.
  19. I’m surprised you found a concern with IR transmission. The Baader solar film has been around for many years with no reported issues. I do recommend a Continuum or similar filter for improved contrast.
  20. Very nice, well done! Always appreciate multi wavelength images.
  21. The mating thread to the eyepiece may be odd ball and depend on the eyepiece.
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