filter question - Photography Help Forum

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Q. filter question

Asked by stuart kennedy (K=172) on 7/6/2004

i was given a kiron 70-210 lens and a polarizing filter to go along with it. i have used other filters before for b/w pictures. what im wondering is do i treat this the same way and over expose a stop or two?

Kurt Pas (K=2267) - Comment Date 7/6/2004

Stuart,

If you have a TTL (trough the lens) exposure meter on your camera, you do not have to over or udr expose. The light meter wil figure it out by himself.

However if shooting slides an 1/2 or 1 stop under expose will saturate the collors more. If shooting negative film you have to over expose for the same effect.

Charles Morris (K=5969) - Comment Date 7/7/2004

TTL metering should take care of any effect the polarizer has, but if you are trying to calculate exposures from a table or with a handheld meter, you can be in for some wild surprises. a polariser is going to drop at least a full stop off your light, and if used for maximum effect i have seen as much as 2.5 stops difference. it mostly depends on how refective the subject was to start with. if you just can't decide for sure, i generally giure 1.5 stops loss with the polarizer and if the scene is mostly over water and you have are using the polarizer to get rid of water glare, i take off an extra stop. it's images with a lot of glare producing surface that change the most and only experience will tell you what fudge factor is best. i generally rely on my in-camera meter when shooting with filters and i double check with a handheld incident light meter to see if i an getting an anomalous reading from the camera's fuzzy logic.

2cents@large.

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