Siebert Telescope Optics (continued)
Image Correction Prism
This is an extremely small image correction prism that inserts into the bottom of any 1.25" eyepiece. It has a clear aperature of just under 1/2" or 11mm and has a very wide field of view even with eyepieces 20mm and up for lower power viewing. It also eliminates the need for a barlow like adapter to add to the eyepiece's height. Since it attaches directly to the bottom of the eyepiece it fits into yoru focuser or barlow without any additional lenses or focuser height. Perfect for telescopes, both refractor or reflector, that need the image corrected both right to left and up-side-down to right-side-up. Will not work with the ETX. It adds 0" height to the lens that it is inserted into. A great alternative to the bulky, expensive erecting prisms on the market.
.965" image correction prism
This is a .965" image correction prism. It is basically the same as the one above except it fits the .965" eyepieces.
.965" 10mm wide angle eyepiece
This is a .965" 10mm fully coated 3 filament eyepiece which produces extremely wide angle at all magnifications. When viewing the moon not only does it produce an extremely sharp and crystal clear view with perfect color quality, but it takes in the entire view of the moon with room to spare. That is how wide a view this lens gives. The optics as mentioned are coated for maximum light transmission. Also using the 3 filament lens system it fully corrects for color aberrations. This lens uses an achromat lens system with an additional magnifier and field of view expander.
.965" 14mm wide angle eyepiece
.965" 17mm wide angle eyepiece
This is .965" 17mm wide angle eyepiece. It basically has the same features as the 10mm except it has a lower magnification.
2" eyepieces
32mm and 45mm
The first one is a 32mm wide angle 2" eyepiece. It has a 67 degree field angle. 34mm clear aperture and over 1" of eye relief. It delivers extremely clear, sharp images at wide angle. It also has good color correction and all other aberrations are corrected for. This lens uses very similar optics as the 45mm 1.25" eyepiece but with a much wider barrel diameter with an unobstructed field angle. Light filters snap snugly into the bottom of this eyepiece by means of a neopreme gasket. They will not fall out.
Next is the 45mm wide angle 2" eyepiece. It has a 57 degree field angle, 34mm clear aperture and over 1" of eye relief. It also delivers extremely clear sharp images at wide angle and good color correction. Also all other aberrations are corrected for. What was said about the 32mm can also said for this eyepiece except the higher focal distance and lower magnification makes this eyepiece take in a larger section of sky. Again this lens uses similar optics of the 45mm 1.25" eyepiece. Again light filters snap snugly into the bottom by means of the neopreme gasket. Many like this method better than the screw in on standard eyepieces.
LIST OF EYEPIECES:
1.25" EYEPIECES: (See Page 1 for description)
Image Correction Prism (11mm)
Large Aperture Image Correction Prism (1/2")
9mm eyepiece with Eye Relief (ER) of 5mm and 50 deg. fov;
12.5mm wide angle with ER of 7mm and 65 deg. fov;
18mm wide angle with ER of 7mm and 65 deg. fov;
21mm superwide angle with ER of 8mm and 80 deg. fov;
29mm high eye relief with ER of 24mm and 52 deg. fov;
32mm wide aperture with 25mm of ER and 52 deg. fov;
35mm wide aperture with 27mm of ER and just under 50 deg. fov;
45mm ultra wide aperture with 29mm of ER and just over 40 deg. fov;
.965" EYEPIECES:
Image Correction Prism (11mm)
10mm wide angle with 7mm ER and 65 deg. fov;
14mm wide angle with 7mm ER and 65 deg. fov;
17mm wide angle with 7mm ER and 65 deg. fov;
23mm wide angle with 9mm ER and 55 deg. fov;
2" EYEPIECES:
32mm wide angle with 24mm of ER and 67 deg. fov;
35mm wide angle with 26mm of ER and 62 deg. fov;
38mm wide angle with 26mm of ER and 60 deg. fov;
45mm wide angle with 27mm of ER and 57 deg. fov;
51mm wide angle with 27mm of ER and 52 deg. fov;
VIEWFINDERS with CROSSHAIRS: (See Page 3 for descriptions)
8X25mm Straight thru
8x25mm 90 deg.
10x35mm Straight thru
10x35mm 90 deg.
6x50mm straight thru
6x50mm 90 deg.
6x50mm straight thru red FiberOptic Illuminated crosshairs
6X50MM 90 deg. red FiberOptic Illuminated crosshairs
Viewfinder holder upgrade
BINOVIEWERS (See page 4 for description
If you would like more information about any of these eyepieces please email me at hs3980@earthlink.net. Please provide me with which eyepiece(s) you want more information about.