Re: [ATM] 8" F/4.2 progress

[Richard <cnc@cncservo.co.uk>]

Hi Jean-Guy,

Thursday, October 27, 2005, 6:07:07 PM, you wrote:

JGM> Interesting, do you have experience to share ?

Get it here : http://home.earthlink.net/~burrjaw/public/hart2d.zip

It's very easy to use, just follow the instructions. Basically
you place a mask over the mirror which consists of a piece of
card with a square grid of rectangular holes. You then take a
photograph from just above ROC point witha light source just
below ROC. You plug the resulting photo into Jims' program and
define where the image of each hole on the grid is. The program
then does FFT calculations to establish a full map of the mirror
surface - something Focault will never do.

-- 

Best regards,
  Richard in the UK

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