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14bit ADC & 13 stops DR
but no box or bracket
even at high magnifications
Finder scope lens diameter
131F Flat-Field Tripod 14bit ADC & 13 stops5" 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
