Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Fast vs. Slow

  1. Jun 15, 2003 #1
    I need tips on how to slow down a fast telescope. I've heard of showercaps, endcaps, and dustcovers; but what I need are details on how to construct a good quality piece that will stop down the aperture.
  2. jcsd
  3. Jun 15, 2003 #2


    User Avatar
    Science Advisor
    Gold Member

    Try the forums at www.astronomy.net. They are more into telescopes and other instruments than here.
  4. Jun 15, 2003 #3
    Thanks mathman:

    I bookmarked that site for future reference.

    To answer my question for others, an off-axis mask will do the job nicely. Constructed easily from a 3/4" piece of plywood and a hole. This will (possibly) stop down the aperture which dims objects, but gives them more contrast and sharper images.

    It also makes it possible to create a place to "cap" a solar filter on to a large scope without purchasing a large solar filter (expensive).
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Fast vs. Slow
  1. How Fast? (Replies: 2)

  2. Is Venus Slowing Down? (Replies: 3)