Great image. How are you tracking the ISS?

I have an automatic tracking program which works with the LX200. It acquires the ISS in a 50mm guidescope which has another camera. It then adjusts the RA/Dec motors to keep the ISS in the middle. The main camera then takes a video at f10 through the main scope. I can track the ISS throughout the entire pass so I can usually find some moments of above average seeing and get an image like this 

Loads of detail Phil- excellent. Interested to hear you are tracking automatically.

Martin

That really is an excellent image, Phil. Do you see any effects of mirror-flop as the telescope orientation changes? That's something I've had some trouble with using a Newtonian for the ISS.

Chris

Hi Chris, The old LX200 classics often had severe mirror flop but I got lucky and got a good one. In my case there is virtually zero image shift when I focus and judging by the automatic tracking log there is no point where a sudden correction is needed so I don't think mirror flop happens. 

BTW your lunar transit images are great especially the one near the terminator. 

Cheers

Phil 

Thanks Martin. Automatic tracking relies on a quirk of the LX200. If you send a series of GOTO's at about 10 per second instead of just getting confused it follows a smooth trajectory.