Re: Focal Lengtht

>Questions: How is focal length calculated?

Greg Guffey

f =   r x r
     4 x c

F= focal length
r= radius of the dish
c= depth of the dish

If you have a 150cm dish with a depth of 20cm, then it looks like this:

      75 x 75
f =   ----------  = 72.2cm
       4 x 20

Christian Mass (Dr.Dish)
Editor of TELE-satellite International (http://www.TELE-satellite.com)
Producer of drdish@tv, Europe´s first satellite info-channel

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