Star diagonals?

[flight69er]

I just had delivery of my SW Starwalker 80 OTA. Unfortunatley it comes with a 45degree erect prism diagonal , which has gone straight onto ebay. So now I'm looking for a 90degree star diagonal. Which is better prism or mirror & can anyone reccomend one for under £50 or there abouts?

[Merlin66]

Either design is OK.

I personally prefer the front surface mirror type....but that's me!

( They claim the mirror transmission is higher >98% and the surface accuracy is better 1/10 wave v's 1/4 wave)

Ken