Yes, with wireless remote transmitters which relay the information from the
coupling ring position to the diaphragm, and small servo motors to close
the diaphragm.. No problem. ;-)
John Hermanson
___________________________________
http://www.zuiko.com
Camtech, Olympus Service since 1977.
21 South Lane, Huntington NY 11743-4714
Phone/fax 631-424-2121
Free Olympus Manuals: 1-800-221-3000
___________________________________
----- Original Message -----
From: "Winsor Crosby" <wincros@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, November 02, 2001 1:27 PM
Subject: Re: [OM] dust in the lens
| >At 10:25 PM 01/11/2001 -0800, you wrote:
| >>So how do dust get into the (older) lens? I can see fungus growing
| >>due to moisture content, but dust? Or may be they are paint and
| >>whatnot from the interior of the lens?
| >
| >Lenses are open tubes, generally (this allows them to change their
| >length in focusing operations). As you move the tube back and forth
| >during focusing, air gets sucked in or blown out, and with it, dust.
| >The only exception to this are "internal focusing" lenses, which
| >still have moving tubes, but are enclosed in an outer tube of fixed
| >length (so it can be 'completely' sealed). Even with sealed tubes,
| >there are still mechanical linkages which allow small quantities of
| >dust in over long periods of time.
| >
| >The dust is generally harmless, although large quantities of it can
| >lower contrast significantly. The dust particles do not resolve in
| >the image.
| >
| >Garth
|
| Presumably one could build sealed lenses with inert gas
| pressurization like binoculars from Leica or Zeiss, at similar cost.
| --
| Winsor Crosby
| Long Beach, California
|
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