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URL: http://www.thaiexcite.com/Askar-0.7x-Full-Frame-2.5-Reducer-f-3.9-for-Askar-FRA400-72mm-FRA500-90mm-Telescopes.html

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*PREORDER* Askar 0.7x Full-Frame 2.5" Reducer f/3.9 for Askar FRA400 72mm & FRA500 90mm Telescopes

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รายละเอียด

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Askar 0.7x Full-Frame 2.5" Reducer f/3.9 for Askar FRA400 72mm & FRA500 90mm Telescopes

Askar provides a brand-new F3.9 full frame reducer for FRA400 astrograph, further reducing the focal length and thus shortening the exposure time on its original 400 focal length and f/5.6 focal ratio design basis. The reduction factor is 0.7×, and the reduced focal length is 280mm, which can satisfy most deep-sky astrophotography. The back focus is standard 55mm. The reducer has built-in M48×0.75 thread, easy for the attachment of 2" filters.

Note: This item may or may not have the 'Askar' brand imprinted on the item as pictured above. It just varies from batch to batch.