Ok just tried out my G3 with my new to me Pany 20 1.7. While I do think I will enjoy this lens, it seem I have to use. Higher ISO on it for inside shots than with my Canon body paired with a 2.8 lens. Am I just imagining this?

Hi Mate
I am confused now.
What exactly you are trying to ask or tell us?This topic has been discussed here many times so please flick through threads. G3 with 20 mm 1.7 is a nice combo and performs well in low light and low light has different definition for different people. I never go beyond ISO1600 and even my EPL2 performs very well as per my needs
Cheers

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He's asking why his G3 with a brighter F1.7 lens needs a higher ISO than his Canon with a slower F2.8 lens.

The answer is that your Canon has a more sensitive sensor. It's an oversimplification to say that a camera with a faster lens will do better in low light than another camera with a slower lens. There are more variables. Sensor sensitivity is one of those.

I disagree. ISO 1600 is (theoretically) the same on every camera. Of course, some sensors will have different noise results at ISO 1600, but you should get the same light meter reading at ISO 1600 and f2.8 on both the Canon and the G3.

Yes, you are imagining that.

You may have a different meter mode on one camera than the other ... or you may be metering off different surfaces. Or even a combo of the above.

Gary

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Are you shooting wide open with both? Do the images come out with equal brightness? Is the Canon lens stabilized (the Panasonic 20 on the G3 is not)?

DH

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+1 for imagination. If you still have the Canon, try them side by side.

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+2 for imagination (I guess we'd be up to 3 now, but who's keeping count?). Using a faster aperture will require a lower ISO to obtain the same exposure. There is no brand involved in that, and the sensor sensitivity is not involved in the calculation. Sensor sensitivity just affects how high you can bump that ISO before losing quality and has nothing to do with what ISO is required at a given aperture.

But then... you said in comparison to the Canon with an f/2.8 lens. Obviously the Lumix 20mm f/1.7 is a faster lens with the potential for a larger aperture, but you didn't really say which aperture you were using. So just to be sure... you're using Manual or Aperture Priority with the widest aperture, right?

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You don't list the focal length of the Canon lens or what sensor format your Canon camera has. There may be some slight differences in the actual versus reported sensitivity of the sensor. Each camera may meter the scene differently. Any difference in angle-of-view between each combination will result in a different scene with differing levels of luminance.

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>> Insert quote here <<

ISO 1600 = ISO 1600 = ISO 1600. ISO is the International Standards Organization, therefore, ISO 1600 = ISO 1600 = ISO 1600 regardless of the camera being used.