6 Mar
2012
6 Mar
'12
3:09 p.m.
Resolution is more a function of aperture (diameter) than throughput, but it can be argued that increased diffraction from a larger secondary reduces resolution due to poorer energy concentration in the central spot. An 8" mirror with a 100% relfective coating has the same theoretical resolution as one with a 90% relfective coating, however the 100% reflective mirror has a dimmer limiting magnitude. On Tue, Mar 6, 2012 at 3:02 PM, Brent Watson <brentjwatson@yahoo.com> wrote:
The secondary does decrease effective aperture and therefore resolution. As mentioned before the effect can be calculated by subtracting the secondary diameter from the primary diameter. That yields the effective aperture.