Cheap C/CS or M12 lens for camera collimation

[cuivenion]

Can anyone reconmend a cheap C/CS or M12 lens for camera based telescope collimation? I'll be using it with a ZWO asi224.

[RolandKol]

9 hours ago, cuivenion said:

Can anyone reconmend a cheap C/CS or M12 lens for camera based telescope collimation? I'll be using it with a ZWO asi224.

ASI224 comes with a wide field lens and the camera perfectly fits 2" focuser.

However, - in my case, it was still not dead center and did not fit collimation purposes

[cuivenion]

It's a fish eye lens though, so I imagine that would effect the accuracy.

[RolandKol]

14 minutes ago, cuivenion said:

It's a fish eye lens though, so I imagine that would effect the accuracy.

Nope... picture is nice and not distorted, just try..

The main headache, to place camera square.

[cuivenion]

Nice one I'll give it a try then.

[cuivenion]

Nah just checked, its a fish eye lens, pretty sure the walls of my living room aren't meant to curve like that.

[RolandKol]

80% of the image, during collimation will be black.

You will use central area only and will not see any distortion

[RolandKol]

But anyway, it failed in my case...

As l was not able to place it central/square... Went back to Cheshire.

[cuivenion]

I'll have a look for a different lens, I may be being picky but the distortion looks quite severe. Strange in your case that the cheshire is central but the camera isn't.