Same exposure different results?
Dec 30, 2017 12:15:45 #
TheShoe
Loc: Lacey, WA
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.
Too many uncontrolled variables. Do your retesting in your studio where you can control the conditions.
Dec 30, 2017 12:16:27 #
Weddingguy wrote:
You said that you were shooting in aperture priori... (show quote)
You proved something is wrong with the OP camera or lens. In the top examples you varied the exposure and they look difference but not as much as the two in the OP pictures. However, the two pictures that the OP took are of the exact same exposure although with different combination f/8.0 @ 1/125 and f/5.6 @ 1/250. The possibility is that either the f/8.0 isn't f/8.0 due to sticky aperture or 1/125 is much longer than 1/125.
Dec 30, 2017 12:20:10 #
Weddingguy wrote:
You said that you were shooting in aperture priori... (show quote)
The OP's images had the same exposure, when he changed the ap he compensated with the shutter speed so your test using different ap settings in the first group isn't relevant.
Dec 30, 2017 12:27:30 #
BebuLamar wrote:
Well if I were you I would do the test again to see. In fact I would do a lot of tests.
Yes. Test and retest. Either something changed between shots or something is wrong with your camera.
Dec 30, 2017 12:32:38 #
Picture Taker
Loc: Michigan Thumb
It might be if you metered differently. If your camera was aimed at a differently as you squeezed down half way and a spot meter setting. Just an idea.
Dec 30, 2017 12:32:43 #
photoman022
Loc: Manchester CT USA
when you do the test use a tripod and a remote to fire the shot so you take the same scene.
Dec 30, 2017 12:36:34 #
bcrawf wrote:
That cannot be the explanation if the exposures are the same value (which the record says they are).
Not so. One was 1/125 and the other 1/250. If the camera moved and measured mor light it would speed up the exposure. Happens all the time hand holding with bright sun and shadows. Not a camera problem. Hard to be more specific without knowing the metering mode.
Dec 30, 2017 12:40:29 #
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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While the thread has been going for a long time already... The capture angle has changed a bit. Check where the camera did its light measurement, this might tell you why there is a change not only in settings but the light quality. By the way, check the settings and you will realize that there is a change in exposure scale, raise one, lower another in equal values. (Same exposure, different scale)
I find this a good lesson to learn about the effect of choices when selecting settings in manual mode. We all know more speed = less light but is also influences the light quality same as changing the aperture up. Speed has the most influence in light quality.
Dec 30, 2017 12:40:38 #
BebuLamar wrote:
Well if I were you I would do the test again to see. In fact I would do a lot of tests.
Dec 30, 2017 12:46:19 #
I am in here late so I don't know all the responces. I see the people have moved in the shot, so my guess is the focal point changed.
Dec 30, 2017 12:52:34 #
Rongnongno wrote:
While the thread has been going for a long time al... (show quote)
"more speed = less light but is also influences the light quality"
Ron, I'd like to learn more about that, would you point me in the right direction?
Dec 30, 2017 12:54:01 #
Dec 30, 2017 12:54:15 #
par4fore wrote:
Agree, the meter re-evaluated base on the lighting in theses photos this might be likely.
Of course! No way can you keep the camera stationary for 20 seconds between shots while making changes to the settings.
Dec 30, 2017 13:00:03 #
Rich1939 wrote:
"more speed = less light but is also influences the light quality"
Ron, I'd like to learn more about that, would you point me in the right direction?
Ron, I'd like to learn more about that, would you point me in the right direction?
I wish I could. I have observed this before. I 'just use it'.
I would GUESS that it has to do with the senors reaction to the length of the exposure akin to saturation???
Just do not quote for this, I am only guessing and not an expert.
Dec 30, 2017 13:12:22 #
rook2c4 wrote:
Absolutely it can be done handheld. It's a test on exposure accuracy, not focusing accuracy.
The camera clearly moved, you can see the 2 pictures are not identical. If the camera was moved ever so slightly and it was and not using manual focus, that is going to effect the exposer.
I don’t know man. While I love gear, I can’t think of a reason why I would want to test a brand new camera to see if there is anything wrong with it. Was there anything that indicated that there might be something wrong with the camera or lens?
Hate to sound mean, but looking at those two photos, I definitely see something that is very wrong and it has nothing to do with the gear. Unless I am misunderstanding it, these were part of the op doing street photography hence no tripod. I’d start worrying about my composition skills and do it in a hurry.
But that is just me. I don’t think there is a reason to think that this camera is faulty.
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