[rollei_list] Re: Lens coatings and veiling flare.
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 07 Jul 2009 18:25:32 -0400
On 7/7/2009 6:20 PM, Eric Goldstein wrote:
But it would be interesting to hear from Richard or other
knowledgeable parties as to whether new single coating technology is
superior to the single coating methods of the 50s... you'd think it
would be and there would be some improvement after 50+ years...
Eric
Of course it is. Call John Van Stelten for a technical discussion. The
original lens coatings were both chemically poor and optically less than
ideal: even early "hard" vacuum coatings were relatively soft and, in
many cases, the coatings have gone from the front and rear elements,
leaving only the internal elements coated. And the precise ability to
coat for a given wave-length took fifteen or twenty years to develop.
Modern coatings are far more durable and the wavelength control is far
better than it was a half-century back.
Marc
--
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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