To: Pentax List <[EMAIL PROTECTED]>
Subject: Filter Factors Page Updated
I've updated the Filter factors page to include a table showing the
conversion from filter factors to f/stops. I thought that might be
useful.
The page is:
http://home.earthlink.net/~belinkoff/cameras/filte
For anyone interested in this thread, I put together a table of filter
factors for various Kodak films and Wratten filters. The information
came from Kodak's Professional Photoguide.
What is clear is that filter factors are not absolute, i.e., medium
yellow = a factor of 2.0, or one
"Anand DHUPKAR" <[EMAIL PROTECTED]> wrote:
>I think I missed some e-mails, however, there was some discussion on 13%
>grey or 18% grey. Would someone explain that part to me a bit ?
>More importantly, is there any book which would explain the zone system ?
There was a long thread on this subje
>Reply-To: [EMAIL PROTECTED]
>To: [EMAIL PROTECTED]
>Subject: Re: Filter Factors
>Date: Sun, 16 Sep 2001 21:33:40 -0400
>
>I agree with Shel again! :-) I'm a big fan of spot metering, and I use
>my old analog Pentax Spotmeter extensively, particularly when I have to
>get s
s
why film data sometimes disagrees with the filter factors published by
the filter makers. Meter cells can be colour biased and can run into
trouble with strong colour shifts such as filtered light or very low
wattage tungsten lights.
Lastly, a scene can comprise a combination of illumination
- Original Message -
From: "Bob Rapp" <[EMAIL PROTECTED]>
> Reflectivity (not reflections) from the whitest white to the deepest
black
> (not deep shadows) covers a 5 stop range. That is to say in an evenly
> illuminated scene of varied objects, the difference between the
deepest
> blac
Farr" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 17, 2001 2:21 PM
Subject: Re: Filter Factors
> This technique gives you the lighting ratio but it doesn't take into
> account the varying reflectivities of different parts of the scene.
> Thi
This technique gives you the lighting ratio but it doesn't take into
account the varying reflectivities of different parts of the scene.
This can only be done with a reflective meter, a spot meter being the
type best suited to targeting discrete parts of a scene.
Regards,
Anthony Farr
- Orig
would need less compensation than
the filter manufacturer suggests for red and orange filters. This is
why film data sometimes disagrees with the filter factors published by
the filter makers. Meter cells can be colour biased and can run into
trouble with strong colour shifts such as filtered light
Behalf Of
> > Shel Belinkoff
> > Sent: Sunday, September 16, 2001 8:23 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Filter Factors
> >
> >
> > Len,
> >
> > you make it sound as though using a spotmeter is some sort of
> > protracted and complicated e
[mailto:[EMAIL PROTECTED]]On Behalf Of
> Shel Belinkoff
> Sent: Sunday, September 16, 2001 8:23 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Filter Factors
>
>
> Len,
>
> you make it sound as though using a spotmeter is some sort of
> protracted and complicated experience.
I agree with Shel again! :-) I'm a big fan of spot metering, and I use
my old analog Pentax Spotmeter extensively, particularly when I have to
get something right. Most often I'll take a reading on the darkest
shadow area that I want to record, then stop down 2 stops from that
exposure. That puts
- Original Message -
From: "Len Paris" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 17, 2001 5:27 AM
Subject: RE: Filter Factors
>
> That's a good observation from experience. I may be
> old-fashioned but, when I use filters, I
Wm. R. wrote:
> Fortunately, the Zone VI modified meter eliminates this problem.
Sort of.
--Mike
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Shel wrote:
> Everything I've read recently...suggests that the filter factor for a Medium
> Yellow filter (Y2) is 2X, or 1 stop. So, while calibrating my gear
> this morning I decided to check the needed exposure compensation using
> two Pentax spotmeters, the digital Zone VI modified meter and
> I don't think it is possible to get a really accurate meter
> reading from any built in camera meter when metering through a
> coloured filter because of meter non linearity. All of my
> cameras, including the newer MZ-5 shows severe meter
> innacuracy
> when metering through coloured filters. I
- Original Message -
From: "Shel Belinkoff"
Sent: Sunday, September 16, 2001 12:43 PM
Subject: Filter Factors
> Everything I've read recently, including the information sheet
packed
> with my new Pentax SMC filters (my thanks to those who helped
me get
> these
Everything I've read recently, including the information sheet packed
with my new Pentax SMC filters (my thanks to those who helped me get
these great filters) suggests that the filter factor for a Medium
Yellow filter (Y2) is 2X, or 1 stop. So, while calibrating my gear
this morning I decided to
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