General Optics

Discussion of optical systems and their characteristics.
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  • Optics Websites
    by mikemarotta »
    18 Replies
    15297 Views
    Last post by Don Pensack
  • Prism versus diagonal in an old f/9 ED Vixen
    by John Baars »
    10 Replies
    401 Views
    Last post by Lady Fraktor
  • Monocular review
    by Butterfly Maiden »
    4 Replies
    285 Views
    Last post by JayTee
  • Straight Spotting Scope???
    by Colorado Luckydog »
    9 Replies
    737 Views
    Last post by Richard
  • Understanding the (so-called) Dawes Limit
    by mikemarotta »
    2 Replies
    16303 Views
    Last post by helicon
  • Some lenses to play with on the cloudy days
    by j.gardavsky »
    5 Replies
    3258 Views
    Last post by j.gardavsky
  • Change your eye pupil size voluntarily?
    by AntennaGuy »
    15 Replies
    8166 Views
    Last post by AntennaGuy
  • Monolithic SCT from single cylider of glass
    by Chich »
    0 Replies
    2287 Views
    Last post by Chich
  • Coma correctors
    by turboscrew »
    6 Replies
    3623 Views
    Last post by turboscrew
  • Collimation change by off-center secondary's weight
    by SkyHiker »
    3 Replies
    1576 Views
    Last post by Don Pensack
  • The Conrady's Chromatic Condition ...
    by j.gardavsky »
    7 Replies
    3055 Views
    Last post by Lady Fraktor
  • Advances in telescope optics
    by The Happy Parrot »
    12 Replies
    3885 Views
    Last post by Thomas_M44
  • 10 Inch Dob Under Bortle 4 Skies Vs. 6 Inch Refractor Under Bortle 2 Skies
    by Refractordude »
    10 Replies
    3606 Views
    Last post by Ylem
  • 127mm Lens
    by LDW47 »
    7 Replies
    2536 Views
    Last post by LDW47
  • Collimation tools for faster scopes?
    by turboscrew »
    22 Replies
    8380 Views
    Last post by Don Pensack
  • How to Calculate the Limits of Your Telescope
    by mikemarotta »
    8 Replies
    3210 Views
    Last post by Don Pensack
  • Issue with my Coronado PST: shift towards green
    by c12marin »
    4 Replies
    2002 Views
    Last post by Solsearcher
  • Aperture size and "seeing" conditions
    by Piet Le Roux »
    37 Replies
    12304 Views
    Last post by OzEclipse
  • laser ray tracing the zenith prisms
    by j.gardavsky »
    6 Replies
    2384 Views
    Last post by j.gardavsky
  • Finally it looks as if my Antares Versascope will guide.
    by Greenman »
    1 Replies
    1549 Views
    Last post by Greenman
  • Difraction Rings
    by Jones »
    1 Replies
    1571 Views
    Last post by Bigzmey
  • Geometrical optics and focuser
    by turboscrew »
    6 Replies
    3075 Views
    Last post by ARock
  • night vision
    by yobbo89 »
    5 Replies
    3076 Views
    Last post by yobbo89
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