Quote:
Originally Posted by koputai
Hi Guys,
Very noob question here:
Is it possible, useful, or even desirable, to use a star diagonal on a Dobsonian Newt?
Thanks,
Jason.
|
Hi,
I am a bit of a newb but....
Ideally no-one would use a diagonal if they didnt have to.
Why?
(1) They cost money
(2) They dim the image. Not by much, but it is still occurs as there is one extra reflection for the light so some will get absorbed.
Why do people use them?
(1) Better eye placement, so they dont break their backs.
(2) Some scopes wont come to focus without one.
If your eye placement is OK and it should be on a dob then there is absolutely no reason to stick a diagonal in the optical path.
Paul