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Posts posted by jwr

  1. Yes - I saw it too. I was photographing Mars at the time and it was bright enough to make me look up from the scope. It came straight overhead and almost went from horizon to horizon. Bright yellow trail, becoming greenish as it passed. I suspect it was quite shallow as I didn't see it come apart instead it faded to dark red, then disappeared. Spectacular.


  2. I think you're just a bit mixed up with the terminology (bigger v smaller). A fast scope is one that has a lot of light-gathering capability. The direct measurement of this is the f number. A fast f5 scope will gather light quicker than a slow f10 scope.

    The f-number is the ratio between focal length of the scope and diameter of primary mirror or lens. So, a scope with a longer focal length (smaller field of view) needs a correspondingly bigger primary to maintain the same f-number.

    For a given focal length (and telescope design), a faster scope will typically physically bigger than a slower scope.


  3. Thanks all for the positive feedback, as I say there's a lot of room for improvement, but I was pleased.

    JohnC: I think 'barges' are the name given to the dark patches (vortices?) that circulate within the atmosphere.

  4. As Jupiter was looking so clear and brilliant last night I thought it'd be rude not to try imaging it. Normally I'm a deep sky imager, so planetary imaging is something I'm still learning. My first few attempts were thwarted by by scope still cooling down. After about 45 minutes things stabilised enough to start to get reasonable focus and shoot some stable video.

    The result is:


    Jupiter 500 frame stack by jwrfooo, on Flickr

    Shot with a SPC900 & 2x barlow, processed in Registax and PixInsight. I know it doesn't compare to most of the images on here, but I'm rather chuffed with the result. Not sure if I've pushed the processing a bit too much, so I may revisit the data again when I've had some time to think.

  5. That's a cracking start - I love a bit of time-lapse. I haven't tried any astronomy related projects, but here's a couple of my past efforts:

    Farm landscape

    Flower opening

    Can I ask what equipment you've used? I was planning a sequence in which I mount my SLR on a extension arm mounted on my telescope. That way the scope and night sky remains fixed in the FOV and the landscape moves as the mount tracks.


  6. I've had a 925 for about 6 months now and am very happy with it. After a few months of use it's now being upgraded whilst the Scottish nights are too bright. I'm mainly an imaging person, but do enjoy the odd visual session. My upgrades / accessories so far are:

    - Celestron f6.3 reducer

    - Bob's Knobs collimation screws

    - Baader solar film

    - SI Feathertouch focusser (still waiting for this one)

    The rest of my kit is in my signature.

  7. I think it's all about the targets you want to reach. I'm interested in the smaller, more obscure objects in the sky. To that end I'm using my C9.25 with an OAG. I've found it works well for my needs, especially combined with the f6.3 reducer.

    When I want to image wider stuff I'll piggyback my DSLR and guide through the SCT.


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