131F Flat-Field Tripod even at high magnifications

even at high magnifications

the reticle displays Ursa Major and Cassiopeia in relation to the North Celestial Pole

Finder scope lens diameter

ensuring durability

131F Flat-Field Tripod even at high magnifications5" Apo Refractor, Good for Imaging and Visual Description Askar's new 131F Flat Field quad refractor offers sharp images and versatility at a reasonable price. Like its smaller siblings, the 131F's optics cover full frame imagers, without the need for a field flattener. Backfocus distance doesn't need to be precise, making astrophotography simpler when using filter drawers, OAGs, and other accessories. The 131F's 983mm focal length gives you a 2. 1