[rollei_list] Re: Question about Rollei Filters and compensation
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 28 Nov 2005 18:55:23 -0800
----- Original Message -----
From: "Eric Goldstein" <egoldste@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Monday, November 28, 2005 5:55 PM
Subject: [rollei_list] Re: Question about Rollei Filters and
compensation
Richard Knoppow wrote: (snipped)
I think this is the case but it suggests that the filter
factor is no more than a sort of average guide and may be
wrong for some types of objects of scenes.
This is the very point that Slo D. made. Different films
are more and less sentitive to different portions of the
spectrum, and there is a huge creative call that needs to
be made...
Eric Goldstein
---
I am not so sure there is that much difference in
spectral sensitivity among films of similar types. By
similar I mean, for instance, general purpose pan films as
contrasted with tablular grain films or films with special
sensitization such as Technical Pan or traffic recording
film.
Presumably, the fact that most film has a much larger
tollerance for overexposure than for underexposure also
tends to affect required filter factors, i.e., a little too
much is better than too little. Maybe. Again, the nature of
the colors in the scene and their desired rendition in
monochrome is important, but how does one define the
"correct" exposure.
Obviously, if a red filter is used the color of
everything in the scene becomes a shade of red and the
_average_ light level is reduced. But, consider the unlikely
case of an all-red scene. The transmission of the filter
will be nearly 100% there (or lets define it so for sake of
argument). This suggests that the exposure will be the same,
or nearly so, regardles of the presence or absence of the
filter. Is this logic wrong?
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
---
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
//www.freelists.org/archives/rollei_list
Other related posts:
