[rollei_list] Re: Filters
- From: Robert Meier <robertmeier@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 26 Jul 2011 23:46:30 -0500 (CDT)
Richard,
According to that reading a -1 filter would require no change in
exposure. I believe -1, -2, and -3 on the Rollei filters refer to
stops. Carlos' exposure was about 4 and 1/2 stops extra for the
filter.
Robert
On Jul 26, 2011, at 10:55 PM, Richard Knoppow wrote:
----- Original Message ----- From: "Robert Meier"
<robertmeier@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, July 26, 2011 8:30 PM
Subject: [rollei_list] Re: Filters
Carlos,
Shouldn't a -3 compensation resulted in an exposure of 1/30 at f11?
Robert
The filter factor is a times exposure multiplication, so a
factor of 2 means doubling the exposure i.e. half the shutter speed
or one stop more iris. If the normal exposure is 1/100th at f/11
and the filter factor is 3 the filter exposure should be 1/30th at
f/11 or 1/100 at about f/6.3.
See my other post about whether you really want to increase
exposure that much. Since most films will take relatively enormous
overexposure it probably doesn't make much difference.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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