Originally posted by MightyMike be careful you know what you're getting into if you dare to buy... i'll provide full unedited samples of any of the shots from 800mm F8.0 just so you know what the quality is straight from the camera
I would be curious. But I do know about the contrast issues with a mirror lens, and that somewhat more aggressive than usual sharpening helps. Like I said, I had positive experiences with the Sigma 600/8 mirror I used, but not necessarily straight from the camera!
On the other hand, when I said my wallet is itching, it is actually for one of the lighter 500mm mirrors. If I was going to spend over $200 on a 2 lb mirror, I'd probably just get the Sigma. The value of your post for me was in seeing that good results *are* possible from relatively cheap mirror lenses, if one finds a decent one and is willing to spend the time to understand it and process the images appropriately. So I'm thinking the 500mm version of the same lens could potentially be as good, even if I've seen samples from what appear to be dud copies that are nowhere near as good.