Streatched stars assistance

[Carl]

My stars are streaking at the edge of my images. I am using a Celestron C8 with a 6.3 focal reducer, mounted on EQ6 mount on permenant peir.
I have re aligned my scope 3 times (Test result: able to keep star within centre of cross hairs of illuminated reticle for over 10 minutes).
What is going wrong?
How do i get a flat field out to the edge

Regards
Carl

[strongmanmike]

Hi Carl, that image you have attached to your post is way to small to evaluate your problem from..? Can you post a bigger version somewhere?

Mike

[Carl]

Hi Mike
How do i post large images? I'm new at this

[Mighty_oz]

repost the jpg ? at half or ther abouts it's normal resolution and lowish quality will get u a big pic :) just make sure it's below the 200k limit for posting.

[Carl]

Here are close ups of streatched stars that only appear in corners. I am shooting thru a Celestron C8 with a 6.3 reducer. this is attached to an off axis guider then attached to my camera.
My polar alignment tests seem to indicate that i am polar aligned. 10 min test star remained in centre of illuminated reticle.
Each image has the same problem that manifests itself when stacked.

Popping in to Bintel in melbourne on Saturday to see what they have to say.
A member of our club suggested additional spacer rings that may bring the field flattener to its optimum point.

Assistance would be very welcome, I'm baffled

Regards
Carl Rainer

[Hagar]

This might help you Carl. I may have been correct about the distance.
I will be interested to see how you get on.

Check ou this thread on Stargazers lounge.
http://stargazerslounge.com/equipment-help/67685-f6-3-focal-reducer-distance.html

[Carl]

Hey Doug
Thank's for the link. I'm at Bintel Saturday and I'll see what they have

Cheers and clear sky's
carl