Telescope Collection

The FMU Observatory currently offers the following combinations of telescopes and focal plane equipment.
Telescope 14-inch 8-inch 3.5-inch 70-mm
Manufacturer Celestron Celestron Questar Meade
Number in service 1 3 1 2
Nominal focal length 3910 mm 2032 mm 1300 mm 350 mm
Nominal focal ratio (D/f) 1/11 1/10 1/15 1/5
Focal length with 237 CCD camera 3370 mm not measured not measured not measured
Field of view with 40 mm eyepiece 21' 41' 1 degree 4 degrees
Magnification with 40 mm eyepiece 100x 51x 33x 9x
Field of view with 6 mm eyepiece 3.1' 6.1' 9' 36'
Magnification with 6 mm eyepiece 670x 340x 220x 60x
Field of view for our detectors:        
35 mm photographic film (35x24mm) 31' x 21' 59' x 41' 93' x 63' not possible
237 CCD camera (4.7 x 3.6 mm) 4.7' x 3.6' 8.0' x 6.1' 12.4' x 9.5' 46' x 35'

These are the major telescopes we have for use at the Observatory. Not listed below are two Meade 70-mm reflectors and our 3.5-inch Questar.

Instrument SkyQuest IntelliScope Schmidt-Cassegrain Schmidt-Cassegrain Achromatic Refractor Schmidt-Newtonian Classic Dobsonian
Model XT12i C14 C8 AR-5AT SN-8AT XT 10
Manufacturer Orion Celestron Celestron Meade Meade Orion
Type Reflector Reflector Reflector Refractor Reflector Reflector
Diameter 305 mm 356 mm 203 mm 127 mm 203 mm 254 mm
Focal Length/F Ratio 1500 mm, f/4.9 3910 mm, f/11 2032 mm, f/10 1180 mm, f/9.3 812 mm, f/4 1200 mm, f/4.7
Highest Theoretical Magnification 720X 975X 500X 295X 203X 508 X
Resolving Power 0.38 arc sec 0.32 arc sec 0.57 arc sec 0.91 arc sec 0.57 arc sec 0.46 arc sec
Magnitude Limit 15.0 15.3 14.0 13.0 14.0 14.7
Solar Filter Off Axis Solar Filter Off Axis Solar Filter Off Axis Solar Filter (2) None None Full Apperature (2)
Mount Type Dobsonian Equatorial Wedge
Permanent Mount
Equatorial Wedge German Equatorial German Equatorial Dobsonian
Weight 83 lbs
full assembly
45 lbs 21 lbs 15 lbs + 35 lbs tripod 24 lbs + 45 lbs tripod 53.4 lbs
Number in Use 2 1 3 1 1 4
Purchased 2005 and 2008 1981 1981 2005 2005 2008