Question about a light yellow filter

Steve Mack

Member
Joined
Nov 4, 2006
Messages
142
Location
Dillwyn, Vir
Format
35mm
I bought a light yellow filter for B/W work, and the filter factor is 2x. I should know the answer to this, but I'm not sure, since I haven't used a filter in forever. Do I open one stop to compensate?

Also, if I want to reset my light meter to be able to read values directly, where would I set the ISO on the dial for ISO 400 (Kodak Tri-X.)?

Thank you to all who reply.

With best regards,

Stephen
 

Ian David

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Joined
Dec 19, 2006
Messages
1,132
Location
QLD Australia
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Multi Format
Stephen -
If the filter factor is 2x, you need to give your film an extra stop of exposure, eg open up one stop. Or set your light meter as if you are using ISO200 film. (It may help you to think in terms of slower film requiring extra exposure.)

Ian
 

Sirius Glass

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Jan 18, 2007
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50,380
Location
Southern California
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A light yellow filter K1 is a half stop more exposure.
A medium yellow filter K2 is a one stop more exposure as posed in post #2.
 

Kevin Kehler

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Joined
May 14, 2008
Messages
602
Location
Regina Canad
Format
Medium Format
Rule of thumb, one full stop like stated above. If using through-the-lens metering, let the camera do its' own compensation (set at 400 ISO and let camera compensate the stop). If using a spot meter, hold the filter in front of the spot meter to compensate as the light might be different depending on what is being metered.
 
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