Is this focal plane tilt?

[dokeeffe]

Hello,

This evening I put in some time collimating my C11 with the camera in place.

The centre of the field is good, however the bottom left of the field is not good.

I'm wondering if this is some sort of focal plane tilt? Although the star images look more like streaks than out of focus stars.

The scope is a C11 (not EHD), Camera is an Atik383L+ and I'm using a starizona .63 reducer.

Anyone out there have any ideas?

Thanks,

Derek

TOP-LEFT

 

TOP-RIGHT

 

BOTTOM RIGHT

 

BOTTOM LEFT

[Peter Drew]

From an optical point of view it looks like native coma plus a smaller degree of tilt. Worth checking the reducer spacing as this can dramatically affect star images if not optimal.     ?

[dokeeffe]

Thanks Peter,

Actually not much I can do with the spacing. There is a spacer between the camera and the corrector but this spacer was provided by starizona for this particular setup. No adjustment.

I'll check the threads, maybe something loose. 

Derek