The specs show coma = 0.1734 and very little astigmatism - I thought the RC was designed to have zero coma and a fair amount of astigmatism.
19.5 inch RC optics for sale
Started by george_kiger, 10/24/2008 05:25PM
Posted 10/24/2008 05:25PM
Opening Post
Posted 10/25/2008 05:48PM
#1
George Kiger said:
The specs show coma = 0.1734 and very little astigmatism - I thought the RC was designed to have zero coma and a fair amount of astigmatism.
That refers to off-axis coma. Coma can also be present on axis. It is just like astigmatism except it runs in only one direction.
Steve Dodds
Funding Member
