I'm just going by what the shop owner told me on the magnification power,
but I think it must be similar to the one Moose posted, where it's the lens
focal length divided by 10.
Darin
Chuck wrote:
> Microscope eyepieces are generally designated by a magnification factor
> such as 10X. Telescope eyepieces are designated only with focal length.
> Magnification in a telescope is determined by dividing the focal
> length of the objective lens by the focal length of the eyepiece. eg: a
> 135mm lens used with a 12mm eyepiece would yield 11.25X. Field of view
> for the combination is the field of view of the eyepiece (usually in the
> range 35-70 degrees) divided by the magnification. 50 degrees is about
> average for eyepieces these days so 50/11.25 would give a 4.4 degree
> field of view or a bit less then a 500mm lens on a 35mm frame.
>
> Chuck Norcutt
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