- #1
Shreyas Shree
- 18
- 0
I am going to make a Dobsonian telescope. Primarily a 6" f/8. I have no idea what the secondary mirror size would be an its distance from the centre of the primary. I have been told that if the secondary is too small then the effective aperture would be reduced. And i do not understancd these terms: central obstruction and secondary offset.
Thank you in advance
Thank you in advance