Jump to content

andrew s

Members
 View Profile  See their activity

  • Posts

    4,310

  • Joined

  • Last visited

  • Days Won

    6

 Content Type 

Everything posted by andrew s

  1. andrew s
    Oops I intended ADC. Must type slower! Regards Andrew
  2. andrew s
    We look forward to your results. When I was goggling ADC's it soon became obvious they were being used by the big boys at ESO, Kleck and now , soon to be,Todmorden . Regards Andrew
  3. andrew s
    The true smell of tacky hashi. 😊
  4. andrew s
    Enough already, but where do you stand on the rigid foam v cardboard inserts v poly chips v bubble wrap great debate? Does it split opinion like refractor v reflector? Show us your stuffing. Regards Andrew
  5. andrew s
    I think it is a device to measure how unbalanced all you Berlebachites are. Regards Andrew
  6. andrew s
    So you should be. Well done. Regards Andrew
  7. andrew s
    Can't do better than that. Regards Andrew
  8. andrew s
    I have my dream role, retired with reasonable pension. Able to behave as a student but with money. Still happily married so no mating game angst. One scope in sunny Spain for research and one as visual toy in Cheshire. Two charming granddaughters who I can hand back to two grown up daughters when the going gets tough or the afternoon nap calls. Regards Andrew
  9. andrew s
    It the collecting area that counts which is dependent on the square of the diameter. So you 6" = 150mm has (150x150)/(80x80) = 3.5 times more light gathering power. Regards Andrew PS is there is a central obstruction you have to subtract that from the area.
  10. andrew s
    Stayed up to watch it but I was already into astronomy. Truly a step forward. Regards Andrew
  11. andrew s
    Excellent talk. Regards Andrew
  12. andrew s
    Google "Newt for the web". It will let you do all the sums needed for the design. Regards Andrew
  13. andrew s
    Excellent spectra Robin, nice to see a comparison of the coma and tail. Fine work as always. Regards Andrew
  14. andrew s
    If you don't have a bubble level and or can't see the horizon just line up with the direction of the dispersion as seen on the planet or a star. After all that's what you are trying to compensate for. If you can't see it no need to worry anyway. Nice link @CraigT82. Regards Andrew
  15. andrew s
    Yes, however, away from the meridian the two leavers will no longer be symmetrical about the horizontal reference point to counter the atmospheric dispersion. Regards Andrew
  16. andrew s
    The correction has to counter the atmospheric dispersion which is along the parallactic angle. Near the meridian the parallactic angle is vertical ie at right angles to the horizontal. Regards Andrew
  17. andrew s
    That's new information! Search for other images taken that night and see if it shows up. I would suspect a reflection as it has a "circular " halo not shown by Jupiter or Saturn. Regards Andrew Crossed with @Waddensky
  18. andrew s
    Cosmic ray hit? Regards Andrew
  19. andrew s
    Well the weather has been reminding me why I sent my main scope to Spain. Here is the prime focus box on the mk1 telescope at Jodrell bank at x120. It is about 15 miles away. Slightly better than my first attempt . 180 Mewlon and 18mm Brandon into my phone. Regards Andrew
  20. andrew s
    Interesting journey, thanks for sharing. Regards Andrew
  21. andrew s
    I was trying to use some Schmidt camera optics F2 with a large diagonal to make it easier to use. Trying an eyepiece with it I had to look round the hole in the image the secondary made Regards Andrew
  22. andrew s
    Very good result Ri in, well presented. Regards Andrew
  23. andrew s
    I thought that too, however, you might have to look round the central obstruction on a Newtonian or Cassigrain type telescope! A black dot finder. Regards Andrew
  24. andrew s
    The main difference is it uses fused silica prisms rather than BK7 or equivalent which are more expensive but is transparent into the UV. So it is better for Venus UV imaging unless you have UV eyes. Regards Andrew
  25. andrew s
    I have no experience of the mount but the fact an advert refers to light accessories would put me off. Not sure about the capability of your current mount but could that take a bigger scope? Other options could be a CCD or CMOS camera for photometry (with photometric filter) then you can integrate for longer as needed. Regards Andrew
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.