Same exposure different results? Well this is interesting. By reprocity, the exposures should have been the same, but clearly they are not. What am I missing here? -...

JD750 Loc: SoCal

Well this is interesting. By reprocity, the exposures should have been the same, but clearly they are not. What am I missing here?

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ISO 200, 1/125, f8, 0.0 EV
ISO 200, 1/125, f8, 0.0 EV...

(Download)

ISO 200, 1/250, f5.6, 0.0 EV
ISO 200, 1/250, f5.6, 0.0 EV...

(Download)

Robeng Loc: California

JD750 wrote:

Well this is interesting. By reprocity, the exposures should have been the same, but clearly they are not. What am I missing here?

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Is your camera set on bracketing? How long between shots?

JD750 Loc: SoCal

Robeng wrote:

Is your camera set on bracketing? How long between shots?

No it was not set to bracket. I was using Aperture mode auto-exposure, fixed ISO, and evaluative metering. A few seconds between shots.

BebuLamar

Did you convert the 2 RAW files differently?

JD750 Loc: SoCal

BebuLamar wrote:

Did you convert the 2 RAW files differently?

JPEG SOOC.

BebuLamar

Then there must be something wrong with the camera. The bracketing thing is not because if it's bracketing it would use different exposure. The exposure for both shots were the same but with different aperture and shutter speed combination. There could be that either the shutter speed or aperture was wrong and not as indicated.

Jim Bob

JD750 wrote:

Well this is interesting. By reprocity, the exposures should have been the same, but clearly they are not. What am I missing here?

-

Maybe you angled the camera just slightly different between shots resulting in exposure recalibration.

JD750 Loc: SoCal

BebuLamar wrote:

Then there must be something wrong with the camera. The bracketing thing is not because if it's bracketing it would use different exposure. The exposure for both shots were the same but with different aperture and shutter speed combination. There could be that either the shutter speed or aperture was wrong and not as indicated.

It's a brand new camera body. My sinking feeling is something is wrong with the hardware. But I was hoping maybe I missed something.

ejones0310 Loc: Tulsa, OK

Don't know the answer, but I sure like the little dance the guy in the white shirt is doing in the first one.

Could a thin cloud have passed over the sun?

BebuLamar

JD750 wrote:

It's a brand new camera body. My sinking feeling is something is wrong with the hardware. But I was hoping maybe I missed something.

Well if I were you I would do the test again to see. In fact I would do a lot of tests.

Bill_de Loc: US

The settings you posted match the EXIF. The pictures were taken 20 seconds apart.

POLTERGEISTS !

--

Jim Bob

Bill_de wrote:

The settings you posted match the EXIF. The pictures were taken 20 seconds apart.

POLTERGEISTS !

--

Lots of things can happen in 20 seconds.

JD750 Loc: SoCal

ejones0310 wrote:

Don't know the answer, but I sure like the little dance the guy in the white shirt is doing in the first one.

Could a thin cloud have passed over the sun?

Cloud! Yes that is possible! I had not considered that. The sun was low and there were some wispy high clouds. That could happen in a few seconds (20 apparently). That might explain it but since it was an auto exposure mode it seems that it should have compensated.

So as BebuLamar noted, more tests are in order. Damnit. Always difficult, but also fun, learning a new camera body's idiosyncrasies.

SharpShooter Loc: NorCal

JD750 wrote:

JPEG SOOC.

If they are SOOC then why are the crops slightly different? Maybe the white shirt made a difference?
They obviously were not on a tripod. That means you were metering different areas of the scene?
You should have been on a pod and on manual.
I did the same thin last night and went trough 4 stops changing the aperture and the ISO to keep it the same and they ARE the same!!

Maybe your camera is Broken? Was it a Nikon??? That might explain it!!!! LoL
SS

JD750 Loc: SoCal

SharpShooter wrote:

If they are SOOC then why are the crops slightly different? Maybe the white shirt made a difference?
They obviously were not on a tripod. That means you were metering different areas of the scene?
You should have been on a pod and on manual.
I did the same thin last night and went trough 4 stops changing the aperture and the ISO to keep it the same and they ARE the same!!

Maybe your camera is Broken? Was it a Nikon??? That might explain it!!!! LoL
SS

Hand held street shot. Tripods are not so good for the street genre. Sorry to disappoint but this was not one of my Nikons. A peek into the metadata will tell the tale.