Reducing effect of SW CC

[Rustysplit]

Evenin' all.

I have been out playing with my quattro trying to get the guide rollers on the draw tube adjusted properly to cure a tilted image problem. Whilst out playing I thought I would see if the rumours were true about the reduction effect of a SW coma corrector.

Well, by my simple maths they are. I reckon a reduction factor of about .9-.88x

This would make the F4 quattro work at around f3.55-6. Not bad for £100!!

These are the 2 test shots, excuse focus as these were rushed, sorry.

With corrector fitted

and without...

if any one has a means of accurately measuring the reduction, I would be very interested to know. It may also be that I am being stupid and have worked it out all wrong. Feel free to tell me if I should retake my gcse maths

[MartinB]

Pinpoint astrometry will tell you the focal length. I have it within MaximDL and can measure it if you want to send me some unprocessed subs. PM me for email address or post a download link

[Rustysplit]

Here you go Martin,

It will be interesting to see how my dodgy ruler/maths method holds up!!

http://i84.photobucket.com/albums/k30/surreywasp/Astro%20pics/_DSC0034.png

http://i84.photobucket.com/albums/k30/surreywasp/Astro%20pics/_DSC0036.png