Quote:
Originally Posted by bratislav
There is no need to simulate 1/2 wave of spherical, as all modern raytrace programs will be able to easily show the results of 50% of obstruction....
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Guys...just so we are clear about the point I'm making....
An otherwise perfect optic with a 50% central obstruction does not degrade a telescope's resulting images in the same manner as a 1/2 wave spherical error....or turned edge or...or astigmatism etc. etc.... i.e the sort of errors you may find in an optic built to a price, rather than spec.
(download Aberrator...it's free...& play with the values )
One is a frequency domain filter (eg central obstruction), the other is a focus error.....which really will bugger up images, al la Hubble before it was fixed.