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effective focal length telescope LX90 magnifier



 
 
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Old December 16th 03, 03:33 AM
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Default effective focal length telescope LX90 magnifier

In order to get effective
focal length, I need the magnification factor to multiply by my focal
length (2000). Don't know how to get the magnification factor on a
203 Diameter - focal length 2000 with 26 mm lens. I believe it should
be 1.6x but I don't know how to verify this data.

Here is the formula I am trying to confirm:

effective focal length= 57.3 X (image/field of view)(31.75/0.6)

For this formula to work effective focal length should be 3,200 which
would be 2000 (focal length) X 1.6 magnification factor.

 




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