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appendIx a - TeChnICal speCIfICaTIons
opTICal speCIfICaTIons
LCM 60 LCM 70 LCM 76 LCM 80 LCM 90 LCM 114
Design Refractor Refractor Reflector Refractor Refractor Reflector
Aperture 60 mm 70 mm 76 mm 80 mm 90 mm 114 mm
Focal Length 700 mm 900 mm 700 mm 900 mm 660 mm 1000 mm
F/ratio of the
Optical System
12 13 9 11 7 9
Optical
Coatings
Fully Coated Fully Coated Aluminum Fully Coated Fully Coated Aluminum
Highest Useful
Magnification
142x 165x
180x
189x 213x 269x
Resolution:
Rayleigh Criterion
Dawes Limit
2.31 arc
seconds
1.93 arc
seconds
1.99 arc
seconds
1.66 arc
seconds
1.83 arc
seconds
1.53 arc
seconds
1.73 arc
seconds
1.45 arc
seconds
1.55 arc
seconds
1.29 arc
seconds
1.21 arc
seconds
1.02 arc
seconds
Light
Gathering Power
73x
unaided eye
100x
unaided eye
118x
unaided eye
131x
unaided eye
165x
unaided eye
265x
unaided eye
Field of View:
Standard
Eyepiece
1.5º 1.2º 1.5º 1.2º 1.6º 1.1º
Linear Field
of View
(at1000yds)
79 feet 61 feet 79 feet 61 feet 84 feet 59 feet
Eyepiece
Magnification:
28x(25mm)
78x(9mm)
36x(25mm)
100x(9mm)
28x(25mm)
78x(9mm)
36x(25mm)
100x(9mm)
26x(25mm)
73x(9mm)
40x(25mm)
111x(9mm)
Optical
Tube Length
29 inches
36 inches 27 inches 36 inches 27 inches 18 inches
eleCTronIC speCIfICaTIons
Input Voltage 12 V DC Nominal
Batteries Required 8 AA Alkaline
Power Supply Requirements 12VDC-750mA(Tippositive)
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