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Nov 20,  · OCULAR FIELD STOP DIAMETER / TELESCOPE FOCAL LENGTH x = FOV. A Tele Vue 25mm Plossl has a field stop diameter of mm. Used in our mm .

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This number will be found on the eyepiece barrel or top. The average focal length range you’ll find in eyepieces is between 3mm and 40mm, but it’ll be much larger for your telescope. Now, you .