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Originally Posted by wejones
I.....I'm a bit surprised that the offset dishes are actually 0.6-0.7 as you say, and I wonder if that figure is based on the physical dimensions of the dish, or on the dimensions that the dish would have if it were all there and a prime focus. I suspect the former.
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I call it a pseudo f/D (for offset). Yes it's the former (from practical measurement). Just so that we are all in the right space here, this is a diagram of how offsets work ....... as very well described by wejones.
