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Affordable Wholesale Sharpstar Askar 400/f5.6 APO Astrograph Photographic Star Lens 72Q ED Lense Askar FRA400 / Askar FRA 400/F5.6

SKU: 4000988781673
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Specification:

Aperture:72mm
Focal length:400mm
Focal ratio:F5.6
Objective type:Quintuplet dual ED air-spaced APO
Overall length:317mm
Net weight:2.56kg
Standard package weight:2.88kg
Back-end adapter:M68×1 male thread, 2" adapter/1.25" adapter
Accessories: a pair of tube rings, a handle, a dovetail plate, a M68-M48 conical adapter, an inspection list, a manual

The Askar new FRA400 F3.9 full-


frame reducer reduces the telescope’s effective focal ratio by a factor of 0.7x, thus an original f/5.6 becomes an f/3.9 system, your exposure time will significantly shorten, providing a shorter, more optically “fast” focal ratio to make astrophotography more efficient. It designed for use with FRA400 refractor, providing a 280MM focal length for a wider imaging field of view. It achieves the 55MM back focus, and conveniently threaded for use with M48X0.75 (2") filters.

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