camera spacing and distorted stars

alcolmoon

Hi folks, I'm confused as usual.

I have the ASI1600 camera and just bought a Samyang 14mm f2.8 ED AS camera lens. I have the Zwo EOS-T2 adapter.

I have taking some wide field images but the stars to the corners and half way to the centre of the image are very distorted. Is there something wrong with the lens or are my spacing not set correctly. I have attached some images to illustrate the problem

Thanks for feedback

Support@ZWO

What is the back focus of this lens?

alcolmoon

Hi Sean

I am not sure, I have looked on the internet but can find no reference to the backfocus distance of the lens.

Regards

Alec

Sam@ZWO

this is lens aberration

you can try to reduce the aperture of the lens to reduce such issue

alcolmoon

Thanks Sam, I will try different distances in the hope that it will reduce coma.

Regards

Alec

Support@ZWO

You are welcome.