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more pictures of all sorts of septum feeds:
https://www.flickr.com/photos/pe1rki/sets/72157647578150188/

these feeds are all designed by rasto om6aa
more information later, this website is a quick template.

i make 10ghz septum feeds for fd 0.3 to fd 0.7
feed can be made with sma/sma or sma/waveguide or waveguide/waveguide.
the waveguide connection is wr75 and wr75 to wr90 adapters are 75 euro.
reflected on tx and rx port is typical 25db.
isolated 25db or higher. typical 30 but often more.
feed consists of a septum part and a radiation part.
septum part is 100 euro and radiation part is 100 euro.
some radiation parts are more difficult to make and cost a bit more.

below a picture of sma/sma feeds with several different radiation parts.

below the available radiation parts and their fd ratio's.
if you have a very large dish, 3 meters or larger, it is sometimes better to under illuminate for less noise.
the red line is the old ve4ma part, a new super ve4ma part has been desgined that is 5% better.