[pure-silver] Re: Focusing a Verito
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 10 Nov 2008 12:03:29 -0800
----- Original Message -----
From: "mail1" <mail1@xxxxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, November 10, 2008 10:02 AM
Subject: [pure-silver] Re: Focusing a Verito
Richard, I also would be interested in the Veritar pdf as
I have a
Rodenstock Imagon.
Thanks, Jonathan
Jonathan@xxxxxxxxxxxxxxxxx
There is an Imagon instruction manual on the
cameraeccentric site at http://www.cameraeccentric.com Its
in the form of jpg images which must be downloaded one page
at a time but its easy to combine them by using PDF Creator,
a small program that installs as a printer and will convert
any printable document into a PDF.
While the Imagon is also based on a mensicus lens
corrected for color but not completely for spherical
aberration it also relys on special stops which fit on the
front of the lens. The stops have a central opening and also
peripheral perforations. These server the double purpose of
changing the ratio of light entering the center vs: the
periphery of the lens. Since the softness is from
uncorrected spherical aberration the amount depends on where
the light enters the lens, the closer to the center the
sharper the focus. The perforations probably also provide
some softness by diffusion and perhaps by the formation of
multiple out of focus images since each will function as a
pin-hole lens.
Because the Imagon has more degrees of variation than
the Veritar its use is somewhat different. For instance,
there is no iris, the effective stop being controlled by the
front stops which also control the relative softness.
I will attempt to send you the Veritar booklet. Its
nearlly 3 mb so I have had some trouble sending it because
it tends to make the Earthlink mail server choke. I got an
error message last time even though it came through OK.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
