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Spacecake2

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Posts posted by Spacecake2

  1. On 24/07/2021 at 18:35, Mark at Beaufort said:

    I have owned a few zoom eyepieces - baader, televue and more recently a svbony 10 - 30mm. The first two were excellent but much more expensive than the Svbony. I cannot fault the Svbony which I mainly use on my Ha solar scope. I have never tried the 7-21 version but I guess it should be okay.

    What scope are you going to use and what objects. Be aware that the 21mms end will have a narrow FOV.

     

     

     

    Using it on a 10 inch dobsonian for visual 

  2. A few days ago I took 3 photos of the moon and ended up stacking them together… you can still see the difference in the picture is you look closely. The pictures I uploaded were medium quality so they won’t be so clear:( but you can click on them and they will be full quality A36993A0-4F0C-40FF-A2F1-25D1CA85C2BF.thumb.jpeg.e68a021058227c25473fb03a5340d289.jpeg896379A6-9643-4B2F-B54D-8D23CF452857.thumb.jpeg.56d8ab68a29a9bc39ddb464e80f990e2.jpeg

     

     

  3. And I wo

    On 11/06/2021 at 14:09, Alan64 said:

    The 25mm and 9mm that came with your kit are most likely modified-achromats(MA), or Kellners; so-so performance.  However, I got this 4mm, and of the same "series" as the aforementioned, with my Celestron 127mm "Bird Jones" kit...

    SR4mm3.jpg.354c16bb9c829046ebbb8e9640e4f233.jpg

    Folks either hate it, or love it.  I love it, yea, adore it e'en.  It produces a power of 250x with the "Bird".  Jupiter and Saturn through both...

    905390734_082319-JupiterSaturn.jpg.491c60254fffc1b206da18031a9a57c6.jpg

    Now, I saw far more detail, sharpness, during the live view.  When attempting to photograph them, they were moving at a pretty fast clip through the field-of-view, hence those sub-standard shots.   But then, I took a snapshot of the Moon, through the the 4mm and the "Bird".  I set my camera's shutter to 1/45th of a second.  As a result, the image was almost black, but then I brightened it, and was floored...

    258609872_071119-bundled4mm.jpg.dd02e023be09e3f6954fbb8e400c0543.jpg

    Even at that sub-second shutter-speed, the Moon was nonetheless galloping across the field.  What I saw during the live view, again, was tack-sharpness.

    But a reflector has to be collimated spot-on to get results like that, as precisely as the mechanical assemblies of the telescope will allow.  But as my "Bird" arrived, that was not possible.  I had to take the telescope completely apart to enable it to be collimated precisely, also to improve the contrast. 

    My "Bird"...

    finis2b.jpg.02ba9f46b047c1b8028967d37349d53a.jpg

    It is an economical alternative to a Celestron C5.  Indeed, I call it my "C5".

    I also owned a Celestron 127 SLT and I think I got the maximum use out of it before upgrading to a 10 inch dobsonian but I actually preferred Barlow lenses instead of a 4mm.

  4. On 11/06/2021 at 14:14, Alan64 said:

    Oh, if you'd like to give that 4mm a whirl round the sky...

    https://www.aliexpress.com/i/32788749863.html

    I've ordered two eyepieces from that site.  It took a while for each to arrive, but they did.

    They carry a lot of nice eyepieces, and on the cheap.  The only thing is that it takes a while to get it, a month or more.

    I’ve never actually tried an eyepiece with 3mm eye relief but is it actually worth it?

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