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The knife-edge mask test always under-reports the departure of the actual surface from the ideal surface
By George Robert Kepple and Glen Sanner
other software is not precluded
Jupiter and Saturn) intervals over the -600 to +1649
" even for other writers in the field
Annals of the Deep Sky Volume 2 new and returning The knife-edge mask test alwaysBy Jeff Kanipe and Dennis Webb Product information: Softbound, 6 by 9 inches, 334 pages, first published 2015, black & white. Annals of the Deep Sky is a comprehensive reference that guides amateur and semipro astronomers into every mind boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep sky objects. No other popular work in astronomy provides the comprehensive historical background
