Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

  • Announcements



Advanced Members
  • Content count

  • Joined

  • Last visited

Community Reputation

1,602 Excellent


About chiltonstar

Profile Information

  • Gender
  • Interests
    Wildlife photography + astronomy of course
  • Location
    Wessex/N. Berkshire Downs
  1. Magnitudes

    Worth remembering too that the limiting magnitude is a statistical function (50%) for the average person: a more experienced observer can reach fainter magnitudes, given good conditions. Chris
  2. To be fair, they were doing their job. They had had a report of someone dodgy in black with a strange light and some long gun like object (we do have lampers round here, with shotguns with LED lights taped to the top). Chris
  3. Zwo Atmospheric Dispersion Corrector

    Nice review - I want one! Chris
  4. Zwo Atmospheric Dispersion Corrector

    Yes, well worth a comparison! I think with Mars I wouldn't worry about throwing a little bit of light away* whereas with Saturn this might be more of an issue. Chris * for comparison, do we know the light transmission of the ADC, after all there are a few optical surfaces....??
  5. Clearly, with 180 Maks aka "planet killers", you have to take precautions. Chris
  6. Shows my garden as 20.83 which is close-ish to my visual estimates, although I've not used a meter. Chris
  7. I've had an Armed Response Unit in my garden, a helicopter hovering 100m overhead, and what is worse, a police officer asking me "have you been interested in Astrology for a long time?" Chris
  8. Zwo Atmospheric Dispersion Corrector

    Many of us use colour filters for low angle planets which can remove the refraction fringing effect such as a Baader Fringe Killer; in my case I often use a green filter which trims blue and red for this. I wonder if the ADC is more or less effective than this approach? Chris
  9. Zwo Atmospheric Dispersion Corrector

    It would be interesting to hear more accounts of visual observing with an ADC to see whether it is worth trying during the upcoming Mars season (particularly from Peter if he goes down that path, although with that location, he already has 9 degrees elevation or more compared with UK sites!) Pity ZWO don't make an adaptive optics seeing corrector at the same price - that would be attractive as I suspect that most of us suffer more from seeing issues at low altitudes than refraction problems! Chris
  10. Newting for Doubles

    It is a stunning pair, isn't it. With a 2.8 arcsec separation , minimum theoretical mag to see the split would be abou x60 (160/sep). As you say, maybe your rising warm air over the town wasn't helping. It is a pair I show to visitors with my grab'n go mak (127) to demonstrate how colourful doubles can really appear, compared with those grey, faint fuzzy thingies! Chris
  11. ........ctd. I think this sort of effect when imaging something as low in the sky as Sirius is a fact of life. Looking back at old images of mine when imaging Sirius A+B (the Pup which is next to Sirius A), the blue halo above and orange halo below are very obvious, eg in this image of Sirius A+B. North is up. Chris
  12. If it is Atmospheric Refraction (looks like it to me), in Registax for example, there is a mechanism for re-aligning the red, green and blue images - maybe worth loading the image and trying this. Chris
  13. There are a few errors in CDSA, but it is a great book as you say! I imagine the error may have arisen because alpha and beta are the wrong way round in Libra (brightness). The corrupted Arabic names for alpha and beta don't even seem to be listed in Stelle Doppie. Chris
  14. 4 am - best time of the day Stu! Good report, I'll look up Z'genubi to see if it is an error. Chris
  15. The Great 40mm Plossl Blagging

    Very interesting! I use a 40mm Omni as my normal, starting EP with my 180 Mak. Despite the obvious limitations, it works well for me and is good for showing things to youngsters and clearly gives a better exit pupil than shorter fl EPs. Clearly not everyone's cup of tea though, for example the f4 newt brigade...... Chris