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johninderby

Beyond the Event Horizon
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Posts posted by johninderby

  1. One thing to be aware of when fitting a smaller secondary is the quality of it. Most mass produced secondarys aren’t as flat near the edges so often are oversized to avoid the edge problem.  If fitting a smaller one would get a quality one.

    There are pros and cons to doing this. For the minor improvement on planetary with 1.25” eyepieces if using two inch eyepieces edge performance may fall off. Loads of arguments on CN about this. 

    So while yes a smaller secondary can slightly improve contrast on purely visual panetary observing there are downsides as well.

     

    • Like 2
  2. 4 minutes ago, jonathan said:

    Or at the bland pre-recorded dross or depressingly one-topic news on TV.

    I don’t watch the one dimensional news any more. Just skim through the BBC news site and ignore the virus bits. 

    • Like 1
  3. Looks interesting. 🙂

    National Geographic Channel 

    Mars: One Day On The Red Planet

    Tuesday 28th April 

    An epic journey revealing the real Mars, as you've never seen it before. Using data from orbiters and rovers to build accurate views of the red planet and uncover its secrets. On a single circuit of Mars from dawn to dusk, encounter monster volcanos, ancient lakes, alien ice-worlds and spacecraft crash sites. Explore humanity's Martian obsession, join the relentless search for life there, and hunt for a human home on the red planet's surface.

    0F7D5AAC-C15A-4AA0-8617-488E2EA6F7D8.jpeg

    • Like 3
    • Thanks 1
  4. 3 minutes ago, Mark at Beaufort said:

    Thanks John - to be honest I bought a Svbony solar finder which is spot on. I use it on the Skywatcher 150P with the 13mm Ethos and the image of the Sun is in the centre of the OTA. But thanks for the thought.

    I have a Svbony solar finder in the drawer. I use the 9x50 finder to check the sun to see if it’s worth getting the scope setup as the image is big enough to see if there are spots. Well if there were spots to see. 😁

  5. Both are good scopes. The 127 SLT will be slightly better on the moon and planets but the 5SE is a better all round scope and will be a bit better on DSOs  (deep space objects).

    However the 6SE is a brilliant scope and will be more stable on the heavier mount. Bit of a no contest if the budget is there. My favourite small SCT. 👍🏻👍🏻👍🏻

     

    • Like 1
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