A friend has tried a Canon 450 on it but nothing bigger yet. The Starlight 56 has too big a body – the issue being the shutter. The Starlight 25 would be a nice start or better still a 35. However, I don’t have access to anything bigger and so cannot oblige. Anyone want to lend me one? 🙂
I think Celestron have said that wings of the focal plane should run off to 60-70% of peak. The 14″ version is better controlled and is corrected better for wavelengths beyond 800nm.