Exposure comp. and white balance on S5

[B92 8NW]

Sorry if this question is a little rudimentary but I'm new, be nice:D

If one uses a colour correction filter that is stated to lose two stops worth of light, how do you adjust the exposure compensation to compensate?

Although the white balance settings on the S5 are excellent, I've been told/read that because white balance algorithms work after the image has been captured, some quality/data is lost...

[dmdigital]

Do a search on white balance tutorials. With out getting to far into it you can (depending on the camera) set the white balance or let the camera do it for you. One of the nice things about shooting raw is you can the correct the white balance off camera in post processing.

Have a look at Nikonians.org they have a good tutorial section, also (ignoring the advertising for their product) Whibal (http://whibal.com/products/whibal/index.html) has a good video explination

[ciapek]

Sorry if this question is a little rudimentary but I'm new, be nice:D

If one uses a colour correction filter that is stated to lose two stops worth of light, how do you adjust the exposure compensation to compensate?

Although the white balance settings on the S5 are excellent, I've been told/read that because white balance algorithms work after the image has been captured, some quality/data is lost...

In my mind I would compensate for the two lost stops of light with a manual correction of your SHUTTER speed by two stops to gain the same Previous exposure. ie Shutter remains Open longer to compensate for the light fall off on the sensor.
Alternatively bump up the ISO by a step.......or to complicate it further a combination of ISO and shutter together to suit the exposure you want.

Alternatively don't bother colour correcting, shoot RAW, and adjust colour temperature and Gamut in Post Processing Software.

[B92 8NW]

Thanks for the replies.

Firstly my camera isn't a DSLR, it doesn't shoot raw so that's out.

But I just read the manual and discovered it does do through the lens light metering - I stumbled across a Flickr Powershot S5 group that advises to meter the scene, attach the filter and meter again to work out the compensation.

Ciapek - the manual advises basically what you have said:D - thanks for the clarification. But you lost me when you said "manual correction of your SHUTTER speed by two stops". I don't understand how you applied the unit "stops" to shutter speed [if that makes any sense lol]. Do you mean I should meter the scene and then adjust the shutter speed in increments until it gives the compensation I want?

[abaddonxi]

One step in shutter speed is the equivalent to a stop of aperture, is equivalent to one unit ISO.

Nice, eh.

Cheers
Simon

[B92 8NW]

One step in shutter speed is the equivalent to a stop of aperture, is equivalent to one unit ISO.

Nice, eh.

Cheers
Simon

Ahh, very nice, but what is one unit of ISO? Is 200 ISO c/w 400 ISO one unit?


I just did a test run and got the desired result using an ISO800, f2.7, 1/25. Seems to me like a combo of arbitrary values:(. Result was good though!

[abaddonxi]

Ahh, very nice, but what is one unit of ISO? Is 200 ISO c/w 400 ISO one unit?


I just did a test run and got the desired result using an ISO800, f2.7, 1/25. Seems to me like a combo of arbitrary values:(. Result was good though!

Difference between 200ISO and 400ISO is one full stop of aperture or one unit of shutter speed.

Film speed - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Film_speed):angel:

Usually lenses are also market with fractional gradations on the aperture, which you'd use to fine tune exposure.

Cheers
Simon