Measuring focal length (1 Viewer)

[intrac]

Can anybody confirm that a physical measurement of focal length is from the deepest part of the dish to the front of the LNB (plastic cover) ?

Thanks.

 

[JohnL]

Can anybody confirm that a physical measurement of focal length is from the deepest part of the dish to the front of the LNB (plastic cover) ?

Thanks.

Intrac,


Since the LNBF is at the focal point of the Dish, the distance from the LNBF to any surface of the Dish's Reflector pan should be the same.

Remember though that a Multiple Slot Dish has several focal points, as different parts of the dish's reflective surface focus to different LNBF's.

John

 

[intrac]

Thanks. You're absolutely right. I never thought of it that way.