Jump to content

Mr Spock

Moderators
 View Profile  See their activity

  • Posts

    18,916

  • Joined

  • Last visited

  • Days Won

    80

 Content Type 

Posts posted by Mr Spock

    8” SCT eyepieces for the Moon

    in Getting Started With Observing

    Posted

    As a general rule x1 per mm gives you the best balance between detail retrieval and contrast loss on an SCT. Any less and you miss detail, any more and contrast reduces.

    I'd increase that to x1.5 per mm for an apo refractor or Mak; both these types have better contrast than an SCT.

    That isn't to say you can't go higher on nights of excellent seeing, but, the detail/contrast relationship still applies.

    • Like 1

    Aperture Fever?

    in Getting Started Equipment Help and Advice

    Posted

    17 hours ago, John said:

    The step from 114mm to 150mm newtonian might show some small gains, assuming a similar optical quality, especially on deep sky objects. Modest though, all things considered. Moving from 114mm to 130mm does not seem worthwhile to me.

    I think you would need to think about moving to 200mm to see noticeable all round improvements.

    If we were talking about refractors the step from 114mm to 150mm makes more of an impact.

    My thoughts exactly.

    • Thanks 1

    SCT collination help

    in Getting Started Equipment Help and Advice

    Posted

    I fitted Bob's Knobs to my C9.25 and never looked back. It makes collimation so much easier.

    Get the scope close enough indoors. You can do that by looking down the corrector end from at least 2m away and making sure all the various rings you can see are concentric. Then go outside and do a star test. At this point make only small movements. The first time might take a while but it will be worth it.

    • Like 1

    Surely a Darwin Award winner....!

    in The Astro Lounge

    Posted

    If you read previous articles on him you'll see he didn't believe in science either. He believed the science behind rocket propulsion was fake.

     "I don't believe in science," Hughes added. "I know about aerodynamics and fluid dynamics and how things move through the air, about the certain size of rocket nozzles, and thrust. But that's not science, that's just a formula. There's no difference between science and science fiction."

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.