D7100 exposure accuracy?

Started Mar 4, 2014 | Discussions thread
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Mystery Guy New Member • Posts: 15
Re: off ?

Mako2011 wrote:

Mystery Guy wrote:

For example, with my 35mm 1.8G, if I start out using Manual mode and F22 (say at 1/6s) to set the exposure, and then just work up through the F-stops keeping the matching exposure (next F16 @ 1/13s, etc.),

f22 and 1/6s is 1/3 stop different from f16 1/13s

the actual results I'm getting seems to be as much as 1 F-stop different across the entire range (between lightest and darkest pictures).

So minor miscalculation might be part of it

So, just trying to take the same image with the same lighting would give a variation based on what F-stop was actually used (even though the camera meter always seemed to say that exposure was 'correct'.).

What increments is your meter set in?

It's currently set to 1/3 stop increments (the default I believe). Maybe what I'm seeing is a metering issue.

For whatever reason, I often see variations where manually adding +0.7 exposure compensation makes things look better to me (in just general picture taking).

I don't know if the following is an expected difference or not, but I quickly took the following two pictures under the same light using Aperture priority and Matrix Metering.

The F22 one seems a shade darker, and if I open the .NEF in Adobe Camera Raw and increase the exposure by 0.7, the two images look a lot closer to each other to me (and have a more similar histogram).

I understand they shouldn't look exactly the same (they are at two very different apertures), but I was hoping that the apparent brightness would be closer. Maybe you can tell me if this is considered an expected amount of variation or not.

Thanks;

F22

F2.8

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