Designed for use with 400mm to 660mm focal length refractor telescopes with focal ratios of f/5 to f/7.5, this Field Flattener lets you enjoy the full potential of your fast refractor telescope for astrophotography. Fully multi-coated optics.
The Orion 0.8x Focal Reducer for Refractors increases any 2" focuser-equipped astrophotography refractor's field of view while reducing the effective focal length by a factor of 0.8x, thereby providing a shorter, more optically fast focal ratio.
Set your camera at the proper backfocus distance with this set of 2"/M48 spacer rings. Includes 5mm, 10mm, 20mm and 30mm fixed lengths plus a variable 9mm-14mm ring. Each ring has internal and external M48x0.75 threads. Can be used in combination.
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