Refractor type Telescopes

Discuss your refractor type scopes here.
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  • Achromat Vs Semi-APO Vs APO - What's The Difference?
    by JayTee »
    59 Replies
    25312 Views
    Last post by Bigzmey
  • SVbony 80ED, thoughts?
    by Ylem »
    17 Replies
    138 Views
    Last post by pakarinen
  • Your refractor - let's see it
    by Nakedgun »
    74 Replies
    8264 Views
    Last post by Dave1
  • New from old 3 1/2"
    by DeanD »
    7 Replies
    334 Views
    Last post by Lady Fraktor
  • How exact does the eyepiece-focuser-diagonal alignment to the objective need to be?
    by realflow100 »
    8 Replies
    852 Views
    Last post by Jones
  • Star test 70mm F6 achromat doublet. with and without central obstruction. + green filter
    by realflow100 »
    2 Replies
    382 Views
    Last post by realflow100
  • Field flattener, Williams old one.
    by Altocumulus »
    1 Replies
    238 Views
    Last post by Altocumulus
  • 100th post on CN
    by Bigzmey »
    36 Replies
    4553 Views
    Last post by KingNothing13
  • "A good 70-mm refractor..."
    by mikemarotta »
    16 Replies
    719 Views
    Last post by mikemarotta
  • Recommendations for a suitable scope for the Fornax LT2 Tracker
    by Deserter »
    5 Replies
    413 Views
    Last post by Deserter
  • TS achro 6" F5.9 - any owners
    by 25585 »
    1 Replies
    228 Views
    Last post by Bigzmey
  • Reflected and scattered light in the zenith diagonal mirror
    by j.gardavsky »
    3 Replies
    477 Views
    Last post by j.gardavsky
  • Scattering of light in the refractor optical tube assemblies
    by j.gardavsky »
    9 Replies
    907 Views
    Last post by j.gardavsky
  • A 30$ svbony SV501 telescope. slight modification.
    by realflow100 »
    0 Replies
    356 Views
    Last post by realflow100
  • Is this a good one?
    by Capt. Midnight »
    5 Replies
    582 Views
    Last post by Ylem
  • cheap 70mm refractor telescope F5.1 testing again
    by realflow100 »
    10 Replies
    872 Views
    Last post by realflow100
  • Whats the typical maximum resolution in arcseconds of a 70mm achromat/doublet refractor?
    by realflow100 »
    7 Replies
    580 Views
    Last post by John Baars
  • My new baby...
    by AstroBee »
    23 Replies
    1985 Views
    Last post by chris_g
  • Picked up this little beauty today.
    by Gmetric »
    25 Replies
    2385 Views
    Last post by Gmetric
  • is it better to correct doublet for center to edge sharpness. or for some other aberration?
    by realflow100 »
    18 Replies
    1316 Views
    Last post by realflow100
  • Astro Tech 115 APO ED triplet (engaged impulse drive)
    by mikemarotta »
    16 Replies
    1923 Views
    Last post by Bigzmey
  • APM 140mm ED, my next intended.
    by 25585 »
    29 Replies
    2836 Views
    Last post by 25585
  • Would You Spend $100 On This Telescope?
    by Refractordude »
    12 Replies
    998 Views
    Last post by Richard
  • Created A Quickie For Days When Tired
    by Refractordude »
    7 Replies
    712 Views
    Last post by dagadget
  • Achromatic and apochromatic doublets
    by James »
    33 Replies
    3159 Views
    Last post by dagadget
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