Quick mag dslr question

[NIGHTBOY]

Hi all, was out taking some shots of andromeda with my dslr attached to my 200p dob skyliner. I was just wondering what Xmag if would of been at??

Many thanks

[Cornelius Varley]

Magnification doesn't apply to imaging. You can work out the field of view using this calculator http://www.12dstring.me.uk/fov.htm . You might then be able to compare the field of view to that given by various eyepieces.

[NIGHTBOY]

I wasn't using an eye piece, I had the camera fixed to the scope so the onl thing you could adjust was the focus not the mag.

[Cornelius Varley]

If you use the field of view calculator in the link you will be able to work out the field of view of the camera. By using this you can then compare it to the view given by various eyepieces to get an equivalent apparent magnification of the camera. Imagers don't use the term "magnification" because it is meaningless where cameras are concerned.

[NIGHTBOY]

Ah great thanks now I see .

Is there a thread you know of on what settings people use???

[glowingturnip]

it's not a magnification at all if you think about it - more a massive shrinking - you're taking an object that's hundreds of lightyears wide and showing it on your computer screen !

Most meaningful comparison you can do is the angle it appears at on your computer screen at say arms length, compared to the angle it has in the sky