Eyepieces |
For the 10" Teleport, I really like the new Pentax XW series, which have replaced my earlier favorites, the Pentax XL series. They are a well-integrated, complete set with very desirable characteristics. They are rather uniform in size and weight, all have 20 mm eye relief, and all have a 70 degree field.
My favorite 4 piece set is the 40mm, 20mm, 10mm, and 5mm. I often carry the 7mm rather than the 5mm since the seeing in this area is often too poor to allow using the 5mm. The 2 degree + field of the 40mm makes it my finder eyepiece. The 30 and 40 mm in the new XW series is too large for the drawer depth of older 10" Teleports. Those delivered in the summer of 04 or later will have the deeper drawer needed for the 30 and 40 mm XW's.
Note that the spacing on the focal lengths in my drawer set is increments of two. A really complete set for serious observing is ideally in steps about half that far apart, or the square root of two. Still, this set of four puts a lot of capability into that small drawer and is very convenient. I put a Teleport adapter on all the 1-1/4" Pentaxes as shown and set them to be accurately parfocal. When I change, I keep looking instead of fiddling. Since the focal length of the new 12.5" is similar to that of the 10", I also like this set for it. Yet it's larger size and Feathertouch focuser allow it to handle most eyepieces available today, including the Nagler "hand grenades."
For the 1-1/4" focuser in the 7" Teleport, things are not quite so straightforward. The Pentax series is too large for its drawer, and a bit much overall for such a small scope. I find the TeleVue Radians to be the best set overall for it, but they dont go long enough in focal length to cover the maximum field. For years I bugged Uncle Al for a 24mm Radian. He always said "It’s impossible" to which I always replied "So it will take you a little longer." Instead, he’s now created the 24mm Panoptic, and it’s a real beauty. This great eyepiece is smaller and lighter than the 22 Pan and without that dual barrel I never liked. It has a full 27mm field stop to cover the maximum true field possible in a 1.25" focuser. Team it with three (four if you can squeeze ‘em in) Radians in the 7" Teleport drawer and you have a 22 lb. observatory you can carry in one hand.
Pentax XW Series EyepiecesAll eyepieces in this series have a 70° apparent field and 20mm eye relief. |
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Focal |
10" Teleport |
12.5" Teleport |
14.5" Teleport |
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Magnification |
True Field |
Magnification |
True Field |
Magnification |
True Field |
|
40 mm | 32 x | 2.18° | 38x | 1.82° | 41x | 1.70° |
30 mm | 42 x | 1.67° | 50x | 1.39° | 55x | 1.27° |
20 mm | 64 x | 1.09° | 77x | 0.91° | 83x | 0.84° |
14 mm | 91 x | 0.77° | 109x | 0.64° | 118x | 0.59° |
10 mm | 127 x | 0.55° | 152x | 0.46° | 166x | 0.42° |
7 mm | 181 x | 0.39° | 217x | 0.33° | 237x | 0.30° |
5 mm | 254 x | 0.28° | 305x | 0.23° | 331x | 0.21° |
3.5 mm | 363 x | 0.19° | 436x | 0.16° | 473x | 0.15° |
TeleVue Eyepieces |
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Focal |
Maker |
Apparent |
7" Teleport |
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Magnification |
True Field |
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24mm | Panoptic | 68° | 41 x | 1.57° |
18mm | Radian | 60° | 55 x | 1.05° |
14mm | Radian | 60° | 71 x | 0.83° |
12mm | Radian | 60° | 83 x | 0.72° |
10mm | Radian | 60° | 99 x | 0.60° |
8mm | Radian | 60° | 124 x | 0.49° |
6mm | Radian | 60° | 165 x | 0.36° |
5mm | Radian | 60° | 199 x | 0.30° |
4mm | Radian | 60° | 248 x | 0.24° |
3mm | Radian | 60° | 330 x | 0.19° |
Teleport Telescopes |
tomnoe@TeleportTelescopes.com |
972-442-5232 |
© 2002 Teleport Telescopes. All rights reserved. Created Jan 2002 by Linda Silas, The Annex Studios