"Inverse lighthouse beam" pattern caused by vignetting as a result of the Petzval design

Bruce Donzanti · January 2023

My Tak FSQ 85-EDX produces the so-called "inverse lighthouse beam" pattern on bright, large stars which has been attributed to vignetting as a result of the Petzval design. Is there a way to correct or reduce this look using PI?

BlockHead · January 2023

Not that I am aware of.

-the Blockhead

Bruce Donzanti · January 2023

Ok- thank you for confirming, Adam

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"Inverse lighthouse beam" pattern caused by vignetting as a result of the Petzval design

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