ASKAR 151PHQ APO QUADRUPLET f/7 Avalon 73x reducer backfocus distance

73x reducer backfocus distance

The adapter is compatible with Celestron Schmidt-Cassegrain telescopes with 3

The QHY CFW3 Large is a motorized filter wheel designed for 7 filters with a size of 2" and 7 unmounted filters with a diameter of 50mm

66x reduction factor transforms the FC-100DZ into a 530mm f/5

The design of these filters is optimised to cut out the typical yellow emission of the sodium and mercury lamps around 589nm

ASKAR 151PHQ APO QUADRUPLET f/7 Avalon 73x reducer backfocus distanceThe Askar 151PHQ is a professional apochromatic flatfield Petzval quadruplet with a focal ratio of f 7 and a corrected field of 60mm in diameter, making it suitable for use with medium format cameras. The largest of the Askar refractors so far, the 151PHQ includes two Extra Low Dispersion glass elements for superb correction of chromatic aberration. The central RMS radius is less than 2 microns, with sharp stars all the way to the edge of the field.