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Stub Mandrel

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Stub Mandrel last won the day on December 1

Stub Mandrel had the most liked content!

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About Stub Mandrel

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    Staffordshire UK
  1. Well the Greeks named it 'galaxy' because it looks like a stream of milk spilt across the sky. Find a really dark site and you will understand why!
  2. If you have a 6" newtonian, consider getting a quality x3 barlow and a dedicated planetary camera, even an AS1120. IMHO these will give you a greater improvement over using a DSLR than changing to a Mak (and I like Maks). My avatar image was taken with a 6" newt.
  3. Stub Mandrel

    Alternative to Baader magic fluid?

    I've polished a stainless steel teaspoon, then quarter filled it with whiteboard cleaner. I'll wait for it to evaporate and report back on any residue (unless the fumes make me too blaaaarghll...
  4. Interesting link. With the SW CC and 130P-DS (f4.7) my curvature map is almost identical to the ES one in that link, except my curvature is only 12% rather than 26% and the corner stars are as round as a round thing. Strange that many people prefer the Baader? Could it be that the 'economy' Skywatcher CC is the best of the bunch? Does suggest it might do a good job with the 200P-DS? Not sure how big the weight difference is between 200P-DAS and 150PL, but the 1200mm 150PL guides well on a HEQ5.
  5. 200P-DS with 0.9 coma corrector would give you very close to 1" per pixel with the ASI1600.
  6. Stub Mandrel

    Alternative to Baader magic fluid?

    I was just going to post exactly that... Other products use ethanol and glycol solution, Zeiss use propanol solution. I have used whiteboard cleaner which is methoxy propanol.
  7. Stub Mandrel

    Stability of PA alignment

    This is at 0.25" per pixel ... but on grass over a fairly sandy soil.
  8. Stub Mandrel

    DSLR Active cooling MOD process - Part 2

    ood question! I found: " Thermoelectric cooling modules are considered to be highly reliable components due to their solid-state construction"
  9. Stub Mandrel

    Stability of PA alignment

    When I image planets with an x3 barlow for 3,600mm focal length the impact of standing near a tripod leg is very easy to see. I now try to be away from the legs and lean over to adjust the mount when doing an accurate PA.
  10. Stub Mandrel

    3D Printed Spool Holder (off topic)

    Err... That was the original concept behind RepRap... FWIW this is my spool holder, uses bearings in the reels.
  11. Stub Mandrel

    Polar alignment accuracy

    If you assume Sharpcap's calculation of accuracy is correct, then my alignment with a new-style polarscope is about 17" and using the Sharpcap routine I can get it below 0.5" with no more than patience. Using the polarscope three-star alignment typically gives me the second and third stars within about 0.1 degree (estimated from camera field of view). Last time using Sharpcap at better than 0.5" I didn't have to adjust for my second and third stars even after slewing from Altair to Andromeda. That said, last night I did planetary imaging as an equivalent of 3,600mm with a just polarscope alignment. The planets stayed pretty much centred even over periods of 15 minutes or longer, maybe I was lucky?
  12. Stub Mandrel

    Jupiter and Mercury - 22/12/18

    Probably be visible in a scope all day, if you can be sure of staying out of direct sunlight.
  13. Stub Mandrel

    Pleiades with strange ring structure

    Given the rings around the bright stars I think it's a reflection somewhere along your tube/focuser.
  14. Stub Mandrel

    The gift of excellent transparency

    Great report,. I can feel your excitement!
  15. Stub Mandrel

    Focus questions

    If you see stars like in the photo above you are not terribly far from being in focus. Just turn the knob in the direction that makes them smaller. In images brighter stars look bigger, I am still getting used to the fact that to you eye all stars look more or less the same size - a pinprick.

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