Pretty good at 400mm. I doubt if I'd do that good.
I was looking at a 8 in telescope for sale locally wondering about using it with my camera but just wondering. I've had a couple of 8 inch Celestron scopes in the past and did not use them enough to keep them. I can't stand the cold weather, my hands go numb almost instantly even with the best gloves and I've tried them all with and without liners. I noticed a pair of electrically heated ones the other day but passed them up, I doubt they would help. Raynaud's Syndrome? Its been getting worse for many many years to the point that I just live with the pain when I have no choice but to work outside when its cold. It doesn't need to freeze, 40 degrees will do it. Fortunately, its just my fingers.
That makes it almost impossible to setup and fiddle with a telescope here in the North, just a couple of months a year have reasonably warm nights. If its warm during the day, I setup close to the house and then go out and fire up the camera. I was fortunate that when comet Neowise was visable in July, it was warm enough tp sit out and photograph it. It was cool but not cold. We seldom get to 70 at night.