Cassegrain Telescopes



Specifications
Classical Cassegrain Specifications
Model No. PI250C, 10" PI320C, 12.5" PI370C, 14.5" PI400C, 16"
Clear Aperture 254mm318mm 368mm 406mm
Focal RatioF/15 F/15 F/15 F/15
Focal Length 3810mm 4770mm 5520mm 6090mm
Primary & Secondary
Mirror		 PYREX - LIGHTWEIGHT CONICAL PRIMARY
By R. F. Royce Optical
Telescope Tube ALUMINUM
Primary Focal RatioF/4F/4 F/4 F/4
Secondary Amplification3.75X3.75X 3.75X3.75X
Spacing (Approx.)29.6"37.6"44.6"61"
Mirror CoatingsAlSiO
Optical Tube Dia.12" 15" 16.5" 19"
Optical Tube Length40"48"54" 66"
Optical Tube Weight40 lbs.60 lbs.85 lbs.130 lbs.
Focuser 2" Feather Touch or 2.7" AP (Specify)
Finderscope 7X50 (11 X 80 Optional)
Tube RingsStandard
Recommended Mount HD150C HD200C HD200C HD300C
Slewing Handles(2)Standard
Tube C'wt. Bar Assy.Standard



Dall-Kirkham Cassegrain Specifications
Model No. PI250DK PI320DK PI370DK PI400DK
Clear Aperture 254mm318mm 368mm 406mm
Focal Ratio F/20 F/20 F/20 F/20
Focal Length 5080mm 6360mm 7360mm 8120mm
Primary Mirror PYREX - LIGHTWEIGHT CONICAL PRIMARY By R. F. Royce Optical
Central Obstruct. ~ 25% by Diameter
Telescope Tube Aluminum
Primary Focal RatioF/4F/4F/4 F/4
Secondary Amplification 5X 5X 5X 5X
Spacing (Approx.) 29.2" 39.2" 45.3" 50"
Mirror CoatingsAlSiO
Optical Tube Dia.12" 15" 16.5" 19"
Optical Tube Length40" 49" 56" 60"
Optical Tube Weight40 lbs. 49 lbs. 85 lbs.130 lbs.
Focuser2" Feather Touch or 2.7" AP (Specify)
Finderscope7X50
Tube RingsStandard
Recommended Mount HD150C HD200C HD200C HD300C
Slewing Handles(2)Standard
Tube C'wt. Bar Assy.Standard

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