200pds & Sony Nex 3

[pringlepowell]

Hi

Having an issue trying to photograph using the above two tools, I have an HEQ5 mount so tracking is not a problem, but it seems as though the Nex 3 sensor is too far from the secondary mirror, so no matter how much I try to focus, all I am getting is the open end of the telescope. Help! By the way I'm doing prime focus photography, which wasn't a problem with my previous Mak Cass.

[Cornelius Varley]

Are you connecting the t-adapeter directly to the focuser or are you using a nosepiece in the eyepiece adapter.

ie

camera > t-adapter > focuser

or

camera > t-adapter > 1.25" or 2" nosepiece > 1.25" or 2" eyepiece adapter > focuser.

If you unscrew the eyepiece adapter from the focuser you should see a male t-thread on the focuser adapter (the part that goes into the focuser). Attach the t-adapter directly to the focuser adapter and the camera should be close enough to reach focus.

Peter

[pringlepowell]

Cheers Peter. My issue I think is I am using a 1"25 adapter going into the 2" eyepiece on the 200PDS. I'm not certain I can get an e-mount for the Nex that will fit a 2" eyepiece, which would solve everything.

Anyone got any ideas?

[Cornelius Varley]

You shouldn't need to use either of the eyepiece adapters. The telescope has been designed to allow cameras to reach focus with some focus travel to spare. This video shows how the t-adapter is attached directly to the focuser

. The relevent piece starts at 3:50.

Peter

[pringlepowell]

So is this a t-adapter, or a T2 adapter with the Sony e-mount?