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...
EricOf 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! --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx- Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org
- Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org
- Online, searchable archives are available at http://www.freelists.org/archives/rollei_list