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GavStar last won the day on October 1 2019

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About GavStar

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  1. I think some night vision discussion on sgl even with the existing few practioners on a separate nv forum would be better than the current virtual zero nv discussion that happens on the eeva forums. A separate forum might also prompt more people to consider trying nv.
  2. Night vision is very different to EAA in terms of practical usage. Cloudynights has recognised this and now has separate EAA and night vision sections. This change has been a positive development for both EAA and NV users.
  3. Jim Unfortunately I don’t think gen 3 night vision monoculars will drop in price anytime soon, particularly in Europe where they are materially more expensive than the USA. (Europeans cannot purchase USA tech due to ITAR regs). I bought my first nv monocular over 3 years ago and prices have remained high since. It’s important to note that for astronomy due to the narrow ha filters used to view nebulae, you do need to get good quality gen 3 technology. Lesser gen 1 or gen 2 (with the exception of photonis intens tubes which also cost £6k plus) just won’t give good results. I think
  4. Is it a lot of gear? I can literally just put it into my diagonal and off I go like any other eyepiece. The actual in use experience is identical.
  5. Here’s a link to the Televue section on night vision which I think is a good starting point for this approach https://www.televue.com/mobile/TV5_page.asp?id=36
  6. Ah now you are changing it from use of electricity to original photons etc...
  7. So is using a Quark for solar visual observing EEVA since it needs electricity? Defining an approach purely based on use or not of electricity is a poor definition imo since the various methods are just so different.
  8. What it’s not for me is night vision - night vision is just another eyepiece in my eyepiece case that can be used in the same way as my Televue, explore scientific eyepieces etc. Virtually all the discussion in this section is about EAA which uses cameras and computers.
  9. The figure I quoted for Celestron is at the 656 halpha band that is critical for nv nebulae observing. I haven’t seen anything specific regarding the Epsilon transmission but would think it would be similar to the other scopes. As Peter says the key advantage of reflectors is the ability to have large aperture to get the necessary image scale for smaller objects with nv, which is what I use my c11 edge and 16 inch dob for.
  10. Eddgie on CN estimates his Boren Simon has transmission in the order of 85% which is the figure Celestron gives for its latest coated scts.
  11. I still think refractors give a crispness of view with night vision that reflectors can’t match Also I believe that mirrors have some light transmission loss that refractors don’t have. The two mirrors in an imaging Newtonian f4 can lead to a light transmission loss of 80 percent meaning it’s actually operating at f5ish rather than f4...
  12. Although I really enjoy the views through my Pegasus Binoscope, recently I've either been using my grab and go refractors for quick and easy observing or my C11 or 16 inch dob for more serious sessions. Since the WO binoscope is not grab and go (requiring my Panther TTS-160 mount) and also has relatively small aperture, I haven't had a proper outing with it since April. Weather conditions have been poor in the UK for the last month or so, but the forecast the other night was for clear skies from 2am, and with Orion nicely visible at that time from my London back garden, I decided it was about
  13. At the start of this year I purchased a Williams Optics Pegasus 103mm Binoscope as discussed here I’ve been delighted by the views given by this Binoscope and in particular the ability to use 2 inch eyepieces. This enables wider fields of view but, importantly for me, enables me to use my 67mm Televue plossls (55mm plossl with Televue 67mm adapter attached) with my two night vision monoculars. Using two eyes is transformation for me for night vision observing in that the two separate images merged give significantly improved views of fine emission nebulae. However, when using the 67
  14. That’s a very good point - yes I think an echo would be very good for this task
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