Telescopes & Binoculars

Question:

Can you help?  I have a 2″ eyepiece and want an adapter so I can fit 1 1/4″ filters to it.  I realize that my field of view will be restricted.  Do you have such an adapter?

Thanks, John

Answer:

John,

Because of the severe vignetting that would result, no one makes such an adapter. However, we know a way around it:

We do have a 2″ female, 1-1/4″ male eyepiece adapter (it allows the use of 2″ eyepieces in 1-1/4″
holders) which is threaded on the bottom for 1-1/4″ filters.

You would sacrifice over 50% of your field of view to use this adapter, but it is on our website,
part number 735-49020. It is usable with 2″ eyepieces that have shorter focal lengths.

Note: if using this adapter in a newtonian scope, it will require an additional 2″ of in-travel in the focuser to come to focus. With any catadioptric scope  having a moving mirror focus (SCT or MCT), it is  more easily  usable.

Don

Lumicon 1.25″ Male - 2″ Female Adapter:

Item No. 105-12011
Manuf. No. Vixen 39852

The VC 200L is an 8″ f/9.0 highly corrected, highly specialized telescope for astro imaging. With its elaborate aspherical optical design it achieves excellent image correction throughout the large illuminated field. (42mm diameter fully illuminated).

See Details:

Vixen Telescope VC200L with GPD2 Mount 39852

Item No. 704-10096
Manuf. No. Televue ETH-17.0

The Tele Vue Ethos eyepieces have pushed the boundries of optical excellence and maximum field of view, creating an unrivaled eyepiece experience. The Tele Vue 17mm Ethos is the latest in the Ethos family of eyepieces, providing an even larger field of view than the original 13mm.

An important benefit of the combination of large apparent field of view and shorter focal length is that for a given field in the sky, higher magnification results in a darker sky background. Fainter stars become visible and more detail is seen on all deep sky objects. The Tele Vue Ethos eyepiece provides another big magnification/contrast jump, yielding dramatic views simply not previously possible in any telescope. With the smaller exit pupil, eyesight limitations are also reduced.

The Televue 17mm Ethos delivers: 100 degree apparent field (50% larger in area than 82 degree Naglers), comfortable eye-relief, accepts DIOPTRX eyesight astigmatism correctors, distortion correction, high contrast and on-axis sharpness for planetary viewing. It is the ?do-it-all? eyepiece perfect for all scopes that can utilize this focal length.

See Details:

Televue Eyepiece 2″ 17mm Ethos ETH-17.0