Home Up Eyepiece Calculator CCD Calculator

These calculators are meant for relatively simple applications, following some simple rule-of-thumb formulae. They are not meant to be used for highly accurate applications.

 

What size image will I get with my Prime system ?

(Prime system = Telescope with CCD only, no eyepieces used)

Focal length of telescope :     mm
Angular size of target :   degrees
   
Image size at focal plane : mm

What size image will I get with my Eyepiece Projection system ?

(Telescope with eyepiece used with CCD or DSLR without lens)

Focal length of telescope :      mm
Focal length of eyepiece :      mm
Angular size of target :    degrees
   
Image size at focal plane : mm

 

 

 

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