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[OM] maximum lens speed

Subject: [OM] maximum lens speed
From: William Sommerwerck <williams@xxxxxxxxxx>
Date: Thu, 28 Jan 1999 05:27:24 -0800
"Has anyone tried to put a close up filter on the 300/.45?"

This amusing typo (the lens would be over 2' in diameter!) got me to
thinking...

I've read that the maximum lens speed possible in air is f/0.7. However,
I've never seen an explanation of this limitation. Does anyone know the
reason?

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