Finder Eyepiece Compatibility

The Questar 3.5", like most catadioptric telescopes, has a wide range of focus adjustments and should work with any eyepiece that physically fits in the diopter adapter. The built in Questar finder has a small range of focus adjustment limited by the diopter adapter. Many 3rd party eyepieces will not come to focus in the finder.

This table summarizes eyepiece finder comparability information from several sources. If your vision is not perfect and you use the Questar without corrective lenses, you results may differ depending on the correction you require and whether the person making the report had corrected vision.

There is also a slight difference in the height of the Questar and TeleVue diopter adapters which may also affect results. The modern Questar 1.25” diopter adapter with Questar/Brandon eyepiece threads and two locking screws is required if both Questar and 3rd party eyepieces will be used with a single adapter. Most of these results are believed to have been obtained with the Questar adapter.

Because of the unknown testing conditions and variation in personal viewing preferences with regard to vision correction, consider this only a rough guide and verify that a particular eyepiece will work in the finder with your own eyes.

Vendor Model Size Focus Barrel Source
Celestron Finder cross-hair (orange) 8x50 Yes 0.965 2
Celestron silver top Plossl 17 Yes 1.25 1,2
Edmund 1-1/8" Yes 1.25 1,2
Kinoptik/Clave Plossl 16,10,8 Yes 1.25 2
Questar/Vernonscope Brandon 32,24,16,12,8 Yes 1.25 1,2
TeleVue Delos 10,6 Yes 1.25 4
Televue Nagler 4.8 Yes 1.25 1,2
Televue Panoptic 15,19 Yes 1.25 1,2
Televue Panoptic 19 Yes 1.25 4
TeleVue Plossl 32,26,25,20,21,17,13,10.4 Yes 1.25 1,2
TeleVue Plossl 25,20,15,11,8 Yes 1.25 4
TeleVue wide 19 Yes 1.25 1,2
Unitron Huygens 25 Yes 0.965 2
Unitron Kellner 18,12.5 Yes 0.965 2
University (70's) Koenig 16 Yes 1.25 1,2
University (70's) Pro Series Ortho 28,10.2,6.8 Yes 1.25 1,2
Cave Ortho 25 Out 1.25 1,2
Celestron Erfle 20 Out 1.25 1,2
Celestron/University Kellner 40,25,25(reticle) Out 1.25 1,2
TeleVue 40 Out 1.25 1,2
University Koenig 12 Out 1.25 1,2
Vernonscope Brandon 7/8",3/4" Out 1.25 1,2
Zeiss 44 41 32 25 Out 0.965 6
Baader Classic OR 6 No 1.25 6
Baader Genuine OR 10 No 1.25 6
Cave Ortho (OrthoStars?) 16,10 No 1.25 1,2
Celestron Ortho reticle 12.5 No 1.25 2
Celestron Ultima 35,30,18,12.5 No 1.25 2
Clave Plossl 20,10,6 No 1.25 1,2
Edmund RKE 28,21,15 No 1.25 1,2
Fujiyama Genuine OR 12.5 No 1.25 6
Meade Erfle 12.4 No 1.25 1,2
Meade RG Erfle 20 No 1.25 1,2
Meade RG Ortho 7 No 1.25 6
Meade SuperWide 24.5, 18 No 1.25 1,2
Meade UltraWide 4000 (rubber grip) 8.8 No 1.25 2
Meade wide 20 No 1.25 1,2
Orion LV 9.5 No 1.25 1,2
Pentax XP No 1.25 1,2
Pentax SMC Ortho No 1.25 2
Pentax Siebert 7.9 StarSplitter 7 No 1.25 1,2
Pentax XF 12,8.5 No 1.25 2
Pentax XW 14,10 No 1.25 1,2
Televue Ethos 13,10,8,6 No 1.25 4
Televue Nagler 9,7 No 1.25 2
Televue Nagler Type 2 No 1.25 2
Televue Nagler Type 4 13,12 No 1.25 2
Televue Panoptic 22 No 1.25 2
Televue Radian 14,18 No 1.25 1,2
Televue zoom 6-3mm No 1.25 2
TMB SuperMono 1st run No 1.25 2
University Koenig 24 No 1.25 1,2
University Ortho 12.5,9 No 1.25 2
University Super Erfle 20,16 No 1.25 1,2
Vixen Lanthanum 10,5 No 1.25 2
Vixen LVW 17 No 1.25 3
Vixen Zoom (no click) No 1.25 2
Zeiss Abbbe Ortho-II No 1.25 2

1. 2002 Yahoo Questar User Group file Qfindlst.txt

2. 2009 Cloudy Nights Questar Forum post by JimK / Skygazer, Posted 01 November 2009.

3. 2016 Yahoo Questar User Group post by Woody Schlom, Post 28045.

4. 2016 TeleVue Questar Adapter Page

5. Eyepieces Used By Questar

6. 2016 Cloudy Nights Questar Forum post by Jon Teets, Posted 22 July 2016.


Revised: 2016-07-23

Content created: 2016-07-22

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