Backfocus for Touptek gpcmos02000kpa

[rohanpai]

Hi all

I connected a Touptek gpcmos02000kpa to Skywatcher 200PDS (hoping to get some videos of the moon), but could not get any focus.

I suspect I need to have a certain backfocus distance to get image on the camera sensor. Anyone has tried this setup? What is the recommended backfocus distance?

Thanks in advance.

Rohan.

[Cornelius Varley]

A couple of photos of how the camera is attached to the focuser might help to solve the problem.

[michael8554]

The sensor is buried inside the blue casing a distance that ToupTek don't show in their dimension diagrams.

Is focus failing because you can't rack the focuser far enough out ? 

Try pulling the camera out of the focuser.

Or does the focuser bottom out ?

Have you removed any unnecessary spacers from the focuser ?

Michael

[rohanpai]

Hi @michael8554 -

I tried your recommendation of pulling the camera out of the focuser and managed to get focus. So I need more distance between the focuser flange and the sensor.