| Mike I. Jones |
| (Carpal Tunnel) |
| 06/22/09 12:35 AM |
| Attachment |
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Re: Revolutionary new way of focusing! No less!
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Here's the Bahtinov for the same 6" f/8 system at 0.55um and ±0.005" defocus as above. The Y-Mask not only gives a brighter image, it is also a cleaner one, as it does not generate all the grating sidelobes the Bahtinov makes (similar to a Ronchi grating). It's definitely a clever improvement over the Bahtinov.
Mike