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markse68

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About markse68

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    Star Forming

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    London
  1. Good question! I tried everything culminating in through bore latching toggle which was the only thing that came up with this https://www.kipp.com/gb/en/Products/Operating-parts-standard-elements/Spring-plungers-indexing-plungers-ball-lock-pins/K0776-Socket-pins-with-folding-latch.html
  2. Hi Wiu -Wiu, yes I had heard that and as a consequence rotated my scope tube several times during the evening in an attempt to avoid it- I don’t think it was hiding in a spike but maybe- maybe I managed to rotate it exactly 90 degrees each time
  3. This is strange- I guess you’re seeing these field stars but I’m seeing maybe some of these Anyway- yes I’ll keep on trying
  4. Thanks for the encouragement Craig- good to know that it should be possible with my scope and my sky. How did you go about establishing the magnitude cutoff for your scope? Just look for known magnitude stars incrementing till you can’t see them?
  5. Had another go tonight. What with the record high pressure we’re in and clear skies forecast I reckoned it would be a good session so I had a “take your scope to work“ day- leaving it in the car all day to make sure it was nice and cool. Paid off in a way- scope was firing on all cylinders straight out the car with nice tight stars and almost perfect star testing . As I’d hoped seeing was really excellent tonight- probably the best I’ve ever had. And no wind which really helped a lot. I saw e and f stars in the trapezium quite clearly- first time for f! I was able to split Rigel easily with a 20mm ep- just 80x mag! Sirius was a nice tight image too- by 10pm it was reasonably high and not the usual disco ball you see at lower elevation. I must have stared at it for several hours. I tried all my best eps from the 20mm through my medium power orthos to my Nagler 4.8. Even tried barlowing the orthos to get 3mm for max 500x. Still no joy . I reckon if I was going to see it tonight was the night. It must be too faint for an 8” scope under Bortle 9 skies I guess. Still it was a really great night and an enjoyable if frustrating challenge. Weird how we see different field stars @John! With my Nagler which should give a similar magnification and fov I think, the dominant field stars formed a W rotated to the nw of Sirius in the ep view
  6. Hi John, had another fruitless look at Sirius last night but I'm a bit confused as I’m not seeing the surrounding stars like in your image. Is this a magnitude thing? I looked in sky safari and can’t see the line of stars either. I guesstimated your fov and played around with magnitude settings - was there something else in your fov that wasn’t a star/s?
  7. Thanks for looking Stu- guess what we need is for someone to actually see it tonight and give the rest of us the info
  8. Hi Magnus, yes indeed I’m never really sure what’s up down east or west looking through mine (also 8” newt) I’m going to check on stellarium when I get to a pc next- does that give accurate positions of orbiting double stars though So my thinking is use Rigel as a reference for both separation and an angular offset position for where to concentrate efforts and to turn scope tube to ensure diffraction spikes (very strong on Sirius!) are not obstructing where it should be. Will have another crack tonight at Flamsteed meet-up where hopefully there’ll be some big fracs too- I’m not giving up
  9. Any idea how it’s position should be relative to position of Rigel b Stu? For some reason SkySafari doesn’t show Rigel b Last night I was out for about 3hrs under clear skies and spent a lot of that time just staring at Sirius wishing the pup into existence but of course it stayed in hiding. Rigel b was at 12 o’clock and obvious. Relatively where should the Pup be? It wasn’t the best seeing though- I couldn’t see trap E star which I’ve seen before a few times.
  10. Why’s it called a mewlon Stu? Is it a type or just a model name? Nice looking scope either way I'm starting to think the pup is just too faint for our London skies but I’d love to hear that’s not the case. It’s about the same separation as Rigel's double isn’t it? At ~300x I’m getting plenty of separation on Rigel to clear Sirius’s flare but no joy seeing the pup
  11. Why is an nd primitive John? Neutral density should affect all wavelengths evenly so it should just dim the view without adding colour shouldn’t it? Or are they really not nd?
  12. Can you elaborate on “better”? I think people use the classical large journal dob bearings with goto and push-to too? I’m really interested in the comparative “feel” of these- the balance of friction/stiction and how useful the adjustability is? Mark
  13. Just wondering do such fine threads actually print 3D?
  14. The background of the current image is a bit lighter than the older image so it’s even dimmer?
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