Quote:
Originally Posted by billdan
Hi Gaston,
Thanks for those PSF's, if those spikes are induced errors, I don't think I would bother with the Edmund product.
May have a look and see if there are other cold mirrors with better specs.
Regards
Bill
P.S that link doesn't work for me either.
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The spikes are the result of some astigmatism error induced by the mirror curved surface. There is also some spherical and field curvature aberrations involved here.
The aberrations and resulting PDF are function of the BWD (the larger the worse) and therefore field dependent.
Also faster scopes (smaller f/#) would exhibit larger aberrations. The problem becomes very challenging with large dichroic mirrors and off axis targets.
The link does not work for me too...