Unleash the potential of your Questar 3.5 with Tele Vue’s 1¼”. Just add the Tele Vue 1.25″ Questar Adapter to use any of the Tele Vue 1¼” eyepieces: Plössls, DeLites, Panoptics, Delos, Naglers and Ethos!
Experience a greater range of magnification and quick-change capability.
Discover improved resolution, color correction and contrast due to the multicoating, blackened lens edges, and new designs.
The threaded eyepiece barrels accept Nebular and other filters, if desired.
And, with fields of view up to 100°, diffraction limited anywhere in the field, your Questar 3.5 finally delivers the magnificent capability inherent in its design and construction.
Ethos 13mm on Questar 3.5″
Getting the Most From Your Questar 3.5
The aperture opening in Questar eyepiece holder limits the true field of view in eyepieces with large field stops. However, compared to the 24mm Questar supplied eyepiece, the Tele Vue 19mm Panoptic has 17% wider true field and the 24mm Panoptic has a 30% wider true field, even with vignetting limiting its potential.
Overall, we recommend the Delos 10mm and Panoptic 19mm. Whileall1¼” TVO eyepieces can be used with the Questar, only the following will focus in the finder mode and offer parfocalization (no need to adjust focus when changing eyepieces) as well.
Tele Vue Eyepieces That Focus in Finder and Telescope Mode
Eyepiece
Finder Mode
Telescope Mode**
Model
FL (mm)
AFOV (°)
Mag. (x)
TFOV (°)
Mag. (x)
TFOV (°)
Plössl
25
50
4.3
11.4
52.0
0.93
20
50
5.4
9.2
65.0
0.75
15
50
7.1
6.7
86.7
0.56
11
50
9.7
4.9
118.2
0.40
8
50
13.4
3.5
162.5
0.29
Panoptic
19
68
5.6
11.4
68.4
0.94
Delos
12
72
8.9
8
108.3
0.66
10
72
10.7
6.8
130.0
0.56
8
72
13.4
5.3
162.5
0.44
6
72
17.8
4.1
216.7
0.33
DeLite
18.2
62
5.9
10.2
71.4
0.84
15
62
7.1
8.6
86.7
0.71
13
62
8.2
7.4
100.0
0.61
11
62
9.7
6.3
118.2
0.52
9
62
11.9
5.1
144.4
0.42
7
62
15.3
4.0
185.7
0.33
Key: FL = Focal Length, AFOV = Apparent Field of View, Mag. = Magnification &, TFOV = True Field of View. Questar Specs: Aperture: 89mm, *Finder Mode FL: 107mm, **Telescope Mode FL: 1300mm
Getting the Most From Your Questar 7
For 7″ Questar models that accept 2″ eyepieces, we recommend 27mm Panoptic or 22mm Nagler Type-4 (both have about same true field size), 20mm Nagler Type-5 and 17mm Nagler Type-4.
Technical Specifications
This finely crafted piece is CNC machined out of solid aluminum stock to complement the Questar.
Its polished aluminum base has blackened anti-reflection threads on the inside aperture to improve contrast.
A black, anodized, knurled focusing-ring allows focusing to the Questar viewfinder optics, and a lock-screw (with two locations for convenience) gives extra security.
