Any maths guys on the forum?

[GazOC]

Nothing too serious, but does anyone know the equation that gives the optimal size of a baffle at any given point on a refractor?

I figure mix up aperture, focal length, postion of baffle and a bit of trig?

[Ant]

sorry just seen this.

Not a maths guy really but it should be too hard to wqork out.

if you have a 6" lens with a focal ratio of F8 (giving a FL of 1220mm).

Then seeing as the light cone has straight sides, the light cone will get smaller uniformly the further down the tube that you go.

So

at 25% towards the focuser the light cone will be 4.5"

at 50% towards the focuser the light cone will be 3"

at 75% towards the focuser the light cone will be 1.5"

I guess that this will be roughly right!

Ant