Advice on my field!

[m37]

Hi

Would anyone be able to have a look at this picture and tell me why I'm getting long stars in some bits and not in others? It is a composite of the extreme edges and corners.

Looks to me like the centre is OK.

Top middle looks OK

Bottom middle looks like the stars are veering off to approx 5 o'clock position

Whole right hand side also veering off to 5 o'clock position

whole left side looks like it is going off in the opposite direction.

I have the WO GT-81 with the WO FR6 (0.8x)into the provided T-Adapter which attaches to a Canon EOS1000D

cheers

[Steve 1962]

You have a PM

[Steve 1962]

I've run the image through CCD Inspector and come up with the following:

I'm by no means an expert, but it looks to me that your sensor is pretty well bang on with your focal plane, but the flattener is slightly over correcting.

I'll watch with interest to see what other views you get.

Hope this helps.

Steve

[m37]

Cheers for that mate, much appreciated.

[ollypenrice]

Chip distance? Tilt in the focuser or, less likely, in the camera?

Olly

[m37]

Chip distance? Tilt in the focuser or, less likely, in the camera?

Olly

Thanks for those possible thingies. Chip distance is spot on the recommended +/- about .5 mm. Tried a different camera, same problem. I think you might be right on the money with the focuser. Just found that as well as the two thumb screws in the drawtube there is also a black nylon grub screw. I'm thinking if I have a play with these then I should be able to get everything centred.

Cheers again

Chris