# 27 May, 2019 19:41
I need to collimate my newton (200mm f/4) and I saw somewhere that the secondary mirror need to be a little bit decentered for telescope with big aperture (like f/4). Is it true ? If yes, why ? And is it necessary even with a barlow 3x (f/12) ?
# 27 May, 2019 20:24
You can check a thread I started a couple of years ago on Cloudynights: https://www.cloudynights.com/topic/581915-fast-newton-secondary-offset-looking-for-feedbacks/|
it has been very useful to me.
|You have no new notifications.|