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This instrument was requested by some of the world's most advanced amateurs
who recognize the inherent advantages of a highly corrected, super-sharp
refractive optical system for widefield high-resolution astrophotography.
Astro-Phyiscs will produce only a limited number of these refractors.
|Color correction:||Less than 0.01 % focus variation from 405nm to 706nm (r to h wavelengths)|
|Clear aperture:||180mm (7.1")|
|Focal length:||1260mm (49")|
|Resolution:||0.64 arc seconds|
|Coatings:||Mufti-layer, overall transmission greater than 97% in peak visual wavelengths|
|Magniflcation range:||22x to 700x|
|Tube assembly:||White, 8" aluminum tube, baffled, flat black interior, engraved push-pull lens cell|
|Focuser type:||4.0" Astro-Physics rack & pinion focuser, 4.5" travel; 2.7", 2" and 1.25" adapters; 2.5" extension|
|Telescope length:||1219mm (48") w/ dewcap fully retracted|
|Weight with dewcap:||34 lbs. (15.4kg)|
|Carrying-case type:||Wood case with grey vinyl covering, foam-lined interior, removable wheels|
|Case outside dimensions:||52" x l3" x l3" (132cm x 33cm x 33cm)|
|Weight of case:||25 lbs. (11.4kg)|
|35mm prime-focus field:||1.1 x 1.5 degrees @ f7|
|35mm telecompressor field:||1.5 x 2.1 degrees @ f5.2|
|35mm field with 2x Barlow:||0.5 x 0.8 degrees @ f14|
|6x 7cm prime focus field:||2.7 x 3.2 degrees @ f7|
Right: Company Seven ATA Case custom fitted for a Astro-Physics 13cm EDT Apochromat Telescope with 2.7 inch Focuser (65,974 bytes).
Click on image to see enlarged view (215,942 bytes).
These cases are made to order with a variety of customer preference choices, and each is custom fitted to a particular Astro-Physics telescope or mount.