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Ships within 48 hours · Estimated delivery Aug 4 - Aug 9
4mm Width 61
9 Focal Length (mm) 1200 Secondary Diameter 34mm Secondary Obstruction (by diameter) 16% Secondary Obstruction by Area 3% Observational Info Dawes Limit 0
Provides streak-free results
The Night Sky
42 arc seconds Resolution (Rayleigh) 0
Guide Star 61 w/Soft Case Color:Gold 4mm Width 61The William Optics GuideStar 61 lens is the same as ZenithStar 61, but with a draw tube in place of the rack and pinion focuser. It also includes a finder mount rail in place of the standard vixen rail. The main purpose of Guide Star61 is as a guide scope for astrophotography. Can be paired with the Flat61 field flattener for use as an imaging telescope. Description Supports QHY, SBIG, ZWO, and other 1. 25" cylinder type guiding cameras Guide scope
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