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kev100

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Posts posted by kev100


  1. Hi there. You’re correct that any or all of the factors you mentioned could contribute to the issue you’re having. Collimating is probably the easiest thing to eliminate. Through the Cheshire, if you can see all the mirror clips equally, the cross hairs align and the centre spot is ... well ... centred, you’re collimated ... You could also check by looking at a bright star .... does it resolve to a pin point , with sharp and clearly defined diffraction spikes?

    Dew can definitely be an issue, but if you can’t see it on the secondary (it never occurs on the primary in my experience), then have you checked the eyepieces themselves, being the only other place it could accumulate? As the issue doesn’t occur on dsos, though you don’t mention which, I’d say dew is unlikely to be the cause. Be careful not to breathe on the EPs ...

    Stray light pollution/reflections could be the issue. Is your dob is a solid tube version (if not, do you use a light shroud?). Try a different/darker location.... (I know, easier said than done).

    I’d say the issue is some combination of atmospheric seeing conditions, plus the fact that Mars is incredibly bright at the moment, and all that light is scattered somehow (you could try fitting the dust cover to the scope and pulling off the small aperture cover to restrict the light coming into the scope...)

    I spent much of last night viewing Mars with my (same) scope and from a pretty dark site, and although it was bright and clear a lot of the time, it did shimmer and wobble around horribly at times, with stray light artifacts coming and going. My eyes were watering quite a bit due to the blustery winds  ...

    Kev.

    • Like 1

  2. 41 minutes ago, Concretedan said:

    Probably get there about 8

    Okay. Im aiming to be there for 9-ish ... can’t make it any earlier. Forecast’s still looking good 🤞😀


  3. 12 hours ago, Concretedan said:

    I'd be up for meeting at Creech Car Park although I'd probably only do a couple of hours (visual with my LX90) as I do have work on Monday!  Still it would be good to get away from the lights in Poole for a bit!  Let me know if you're heading up there.

    Hiya, what time are you thinking of heading out? 


  4. Sunday night’s looking pretty good at the moment, and as I don’t have work on Monday, I’m seriously thinking of a major (all night) session, what’ll probably be the last chance before the colder nights set in.... the question is whether to make it a back garden night, or head down to creech /steeple.... to be confirmed 😀


  5. Hi all.

    I'm sure I must have mentioned how much I love these binos before, but having had them out again last night (first time in ages, and just for an hour), I was reminded of how properly amazing they are. These are my second pair (replaced foc by Celestron after the first pair went out of collimation), and they were checked before being sent to me. Definitely think I've got a good pair!

    The Orion neb looked amazing (big bright arc of nebulosity containing bright, pinprick-sharp stars. Star clusters M35, 36, 37, 38, 44, 45 and 67 were fantastic, M45 showing definite nebulosity (not present when compared to the Beehive). Melotte 111 (Coma cluster) and the little cluster of stars around Meissa in Orion were very nice! Galaxies too: M31, 51, 65 and 66 were all variously-shaped faint fuzzies, but very bright and easy to spot just by scanning around. 

    There's very slight field curvature, all but unnoticeable, but I'd say stars stay sharp to roughly the last 10 percent of the field.

    Definitely a recommended piece of kit!

    Kev

     

    • Like 6

  6. Hi Dan,

    I had my scope out at the weekend (first time in months!), for a couple of public sessions. Seeing was fantastic. Made exactly the same point to those who came out with me ... why ignore 50% of our environment/landscape ?

    All the best,

    Kev


  7. It's been terrible! Can't think when I last had a decent session. Reduced to quick grab and go sessions as and when. Looking reasonable this evening, though, so I might set up while the kids are at scouts :)


  8. Hiya. I'm probably not the best person to ask about their relative disadvantages as I have very limited experience with them. I was gifted one recently (I believe it only cost about 15-20 quid). I assume there are better quality ones out there, which might not cause as much distortion as mine (which as I said, is there, but isn't too bad).

    I'm sure others can offer better advice ...

    Kev

     

    • Like 1

  9. Hiya. If you're not too bothered about a little coma, and it's just for star hopping/finding objects, how about using a 0.5x focal reducer? I too have a fast 10in scope, and sometimes pop my (admittedly pretty cheap one) on my 16mm 68 degree ES MaxVision (turning it into a 32mm EP). The view is actually pretty reasonable.

    Kev

    Screen Shot 2019-11-08 at 15.34.43.png

    • Like 1

  10. Hi Tracy, That's a pretty decent budget. It'd be a good idea to think about the practicalities next. Think about where you'd be observing (back garden, local park, driving out into the countryside, etc). Where will the scope be stored (garage, conservatory, living room), and how much space you have in your house/car. Scopes and mounts can be heavy, so think about what you can manage to lug around. This latter point is important as a scope that's a pain to carry/transport/set up will end up not being used. Will it initially be just for visual use (or do you harbour ideas of taking amazing astro photos fairly soon)?

    Kev


  11. Hi.

    Well, this is an interesting one :) 

    What I'm getting from the various parts of your post is that the main use your scopes get (forgive me if Im wrong) is on short sessions, with a brief glance at particular objects (relatively easy to see ones), and that you'd prefer to do more 'serious' observing, spending longer at the eyepiece, and possibly doing some sketching.

    All the while I was reading your post I kept repeating to myself 'get a big dob' and an observing chair/stool. A 10-14 inch dob would gather much more light than any of your current scopes, allow observing of fainter, more difficult to track down fuzzies, and, with a nice wide angle EP and a comfortable chair, allow you time to really explore the objects on view.

    Don't be put off by the size, though. I, and many others, totally regard a 10 inch dob as a legit 'grab and go' scope, and it'll be good on planets, the moon, doubles, globs and OCs, galaxies, nebulae, etc. A fantastic all-rounder.

    Kev.

    • Like 1
    • Thanks 1
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