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Originally Posted by BobsYourUncle
The eyepieces are what performs the magnification. Magnification = focal length / eyepiece diameter.
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Just a correction on that BYU,
Magnification = telescope focal length ÷ eyepiece focal length not eyepiece diameter.
So if your telescope Focal length is 900mm and you put in a 6mm eyepiece then you have 150x magnification. (900 ÷ 6 = 150)
Quote:
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Originally Posted by Shacky
seeing as i am a real noob, is the eyepiece size of 1.25" the diametre of the eyepiece or a different measurement?
This is the description it gives for the Bushmaster SE114-900
450x Power high resolution, heavy duty aluminum tripod, deluxe equatorial mount.
MIRROR DIAMETER: 114mm
FOCAL LENGTH: 900mm
MAIN TUBE POWER: 150XMAX.
POWER: 450X
ACCESSORIES INCLUDED:A) 6mm eyepiece,B) 20mm eyepiece,C) Lunar filter,D) 2x barlow lens,E) 3x erecting lens
Recommended uses:
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Eyepieces basically come in 3 diameters, 0.96", 1.25" and 2" inch.
That's the diameter of the barrel that goes into the telescope.
If your telescope has a 2" opening then you can use both 2" and 1.25" eyepieces but you need an adaptor to reduce it down to 1.25".
This is not the focal length of the eyepiece. The focal length of the eyepiece is used to calculate the amount of magification it will yield.
This can range from around 50mm down to about 2.5mm even though the diameter of the barrel is the same, either 2" or 1.25".
Hope this makes sense.
Click
here for a quick rundown and diagram