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Finder scope lens diameter
the reticle displays Ursa Major and Cassiopeia in relation to the North Celestial Pole
EdgeHD technology gives you pinpoint stars all the way to the edge of the CCD sensor
even at high magnifications
14bit ADC & 13 stops DR
131F Flat-Field Tripod Finder scope lens diameter5" 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
