NoiseJammer
Celestron Mirror Lens Test
I picked this 1980-ish mirror lens up on flea-bay, so it warrants the obligatory test. The green window near the centre has a bar down the centre.I guess that this is about 3 inches across.... roughly 2.5 km away. I get that this translates to the resolution being better than 6 arcseconds - comparable with what the 40D can achieve at this focal length. Don't let the lights fool you - these are heavily blown out (and they're not point sources anyway.) On the whole, I think it's quite excellent!
Celestron Mirror Lens Test
I picked this 1980-ish mirror lens up on flea-bay, so it warrants the obligatory test. The green window near the centre has a bar down the centre.I guess that this is about 3 inches across.... roughly 2.5 km away. I get that this translates to the resolution being better than 6 arcseconds - comparable with what the 40D can achieve at this focal length. Don't let the lights fool you - these are heavily blown out (and they're not point sources anyway.) On the whole, I think it's quite excellent!