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Samir Kharusi | profile | all galleries >> Galleries >> Testing SuperTeles, 300 to 2030mm tree view | thumbnails | slideshow

Testing SuperTeles, 300 to 2030mm

The primary intent was to test a Celestron C8 OTA (Optical Tube Assembly) regarding its suitability for normal photography. This was then extended to include a Tamron 28-300 zoom lens (at 300mm), a Sigma 500/7.2 and a high-end astronomical refractor telescope (TeleVue Custom 140, 700mm/5.0). Distance to target was roughly 78m (say, 250 feet). Field of view of a 28mm prime on a D30 is shown (= that of a "standard" 45mm lens on a 35mm camera) for reference. The Celestron Ultima 2000-8" comes in a "handy!" carry case. Scope, including mount, weighs 15kg, carry-case 6kg, tripod 7kg. Note size of lenshood, placed on my usual camera bag that carries a D30 + 5 lenses. With various attachments this C8 can be configured for 35mm format cameras to have varied fixed focal lengths (eg from 1250mm/6.3 to 21000mm/128). It can also be used with an astro CCD at 400mm/1.95. The tests below check it out at 1250/6.3 and 2030/10.0. The TeleVue is also quite bulky. In fact when one is considering only the OTAs it is questionable as to which is more "handy" for use at the beach, the TeleVue or a C8. In either case a serious tripod is required. See last slide for overall conclusions.
carrycase
carrycase
compact-not
compact-not
lenshood
lenshood
scope1
scope1
T=rings
T=rings
28mmView
28mmView
300 fullframe
300 fullframe
500 fullframe.jpg
500 fullframe.jpg
1250 fullframe
1250 fullframe
2030fullframe
2030fullframe
700 fullframe
700 fullframe
300center Not Sharpened
300center Not Sharpened
500center
500center
1250center
1250center
2030center
2030center
1250corner
1250corner
2030corner
2030corner
700center
700center
700corner
700corner
All 3 FullSize
All 3 FullSize