hi im an amateur star gazer and want to invest some money in buying eyepieces. as far as i know, i should look for magnification level and what else should i look for?
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Field of view (apparent field diameter) -- more is more expensive.
Focal length (smaller means higher magnification, but the maximum you can practically use depends on your telescope's objective diameter -- 50x magnification per inch of objective is one rule of thumb.
Eye Relief (some eyepiece designs need you to put your eye almost into the eyepiece, tough if you wear glasses, while others may give you 15 to 20 millimeters of eye relief, easier to use)
Eyepiece diameter has to fit your focuser (1-1/4 inch or 2 inch are both common but depend on your scope.) A smaller eyepiece can be adapted to a larger focuser, but not the reverse.
Focal length (smaller means higher magnification, but the maximum you can practically use depends on your telescope's objective diameter -- 50x magnification per inch of objective is one rule of thumb.
Eye Relief (some eyepiece designs need you to put your eye almost into the eyepiece, tough if you wear glasses, while others may give you 15 to 20 millimeters of eye relief, easier to use)
Eyepiece diameter has to fit your focuser (1-1/4 inch or 2 inch are both common but depend on your scope.) A smaller eyepiece can be adapted to a larger focuser, but not the reverse.
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• Focal length (in millimetres):
This determines magnification = telescope focal length ÷ eyepiece focal length
• Apparent field of view (in degrees):
This determines how wide a view you get. Typically 45°–50°, but wide field eyepieces are available (but expensive): 68°, 82°, 100°
• Eye relief (in millimetres):
How high you must place your eye above eyepiece to see whole field of view. Tends to vary with focal length of eyepiece. Short focal length (high power) eyepieces need you to place your eye very close, unless they are a high eye relief design.
This determines magnification = telescope focal length ÷ eyepiece focal length
• Apparent field of view (in degrees):
This determines how wide a view you get. Typically 45°–50°, but wide field eyepieces are available (but expensive): 68°, 82°, 100°
• Eye relief (in millimetres):
How high you must place your eye above eyepiece to see whole field of view. Tends to vary with focal length of eyepiece. Short focal length (high power) eyepieces need you to place your eye very close, unless they are a high eye relief design.
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Question is what are you trying to view? Planets, Nebulae, Deep faint fuzzies? Its first about your telescope requirements then your eyepieces compliment your setup.... I think a good starter telescope is a 8" Dobsonian skyquest, or an ETX 90.