Concentric circles on stars

[ZEbbEDY]

If i understand correctly then when you put a star out of focus then you are supposed to see even circles... when i zoom out all i see is the star getting bigger and lots of dots on it, no circles or rings

Is this a collimation issue or eyepiece? Im using the 2 i got with my scope

Thanks for any insight

(Outside atm there goes my night vision)

[GazK]

sounds like rubbish seeing - my scope is collimated as far as I can tell and yet I've never been able to get a star test that differs from what you describe.

Is what you are seeing the same as the "atmospheric turbulence" diagram near the bottom of this link?

astro babys collimation guide

If so, don't sweat it - you live in the UK!

[Mikea]

Probably just atmospheric/poor seeing.

[ZEbbEDY]

Yeah looks like that

Am in the middle of nowhere and really dark skys but also viewing over 2 roofs and a coal fire reek coming out the chimney

Stuff looks sharp enough when in focus

[MissMessier]

I'd say it due to atmospheric condition