On Tue, 23 Nov 2004 18:56:05 GMT, Larry Stedman
wrote:

Looking for an eyepiece in the 16-22mm range for an Astroscan, to be
used with eye glasses.

It should be fairly small in size and have 20mm eye relief.

The 20mm Orion Expanse looked good at first--- right size and e.r. --
but it's horrendous at the f/4.2 of the 'Scan (only the center is sharp,
the rest is pure seagull, comets, nauseatingly distracting).
Works pretty well in an f/5.4 dob, however.

Tried a 17mm Burgess Optical WA in the little red ball wonder. Quite
nice, better outer fov than the 20mm Expanse, usable in that regard, but
e.r. really not sufficient.

What's the size of the 18mm Radian? I couldn't find specs on its length
at the Televue sight.

Any recommendations?

Larry Stedman
Vestal

Larry;
Both the 18 Radian and the 16 Nagler T5 are fairly small 1.25" barrel
eyepieces. The upper black portion that sticks out of the scope about
an inch and a half tall and are about an inch and a half wide. They
both, of course have chrome barrels that are about an inch and a
quarter long for a total length of about 3".

Email me in private if you need more exact specs.
I hope this helps.

Steve White

TeleVue N. American Rep.
www.televue.com