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nobody

06 Iul 2010 19:09



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Adica din seria aceasta:SkyWatcher 130/900 EQ2 - Focal Length (mm): 900 - f Ratio: 6.92
"optimum" magnification range is 38 to 64 power,
corresponding to 28 to 14 mm eyepiece focal lengths

Eyepiece Focal Length (mm): 2.5 mm
Resulting magnification: 360 - high, rarely usable
Power per inch of aperture: 70 - over 50x/in. - need top quality optics
Exit pupil (mm): 0.36 - <1mm, image may be dimmed
Brightness Factor: 0.002


Celestron AstroMaster 130EQ - Focal Length (mm): 650 - f Ratio: 5
"optimum" magnification range is 33 to 65 power,
corresponding to 20 to 10 mm eyepiece focal lengths

Eyepiece Focal Length (mm): 2.5 mm
Resulting magnification: 260 - seeing limits use of high powers
Power per inch of aperture: 51 - over 50x/in. - need top quality optics
Exit pupil (mm): 0.5 - <1mm, image may be dimmed
Brightness Factor: 0.005

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