Originally posted by RobG: You got plenty of detail! You must have had a long exposure to deal with the f10 fixed aperture? I have a 500mm mirror lens, but the depth of field is wafer thin and manual focus is hard to judge without a split image focussing screen. I suggest you try using the zoom on the live view to perfect the fine focus - at least the moon isn't moving quickly!
The exposure time was 1/200s and with the 2x converter the f-stop was f/20 and I used ISO 1600. This is a mirror lens and at 1000mm it has an even thinner depth of field than your 500mm. I did focus in live view or at least I tried to but the shake makes that extremely difficult. What I need is a bahtinov mask for this lens.
I've gotten better results with a properly focused 300mm but there I'm not fighting a bunch of other issues like shake, tracking, high ISO, f/20
At 2000mm (1000mm plus a 2x teleconverter) everything is moving across the frame quickly, even the moon. At 1/200s there isn't motion blur from the moon moving, but there is motion blur from the shake that hadn't fully died down. The moon was approaching centered when I let go of the camera but had to wait for the motion to die down some for several seconds. In that time the moon had become centered and had moved here off center. A heavier more ridgid tripod would solve a lot of my problems with using this lens.
