Nikon D7100 Exposure Difference
Aug 14, 2017 21:58:22 #
if I take a photo in Auto at f8 and 250, then immediately switch to manual and set the same f8 and 250 and take the same pix I get very different results. The auto pix looks overexposed and the one taken in manual mode is spot on.
Why?
Why?
Aug 14, 2017 22:05:56 #
Aug 14, 2017 22:10:40 #
reddoorcullman wrote:
if I take a photo in Auto at f8 and 250, then immediately switch to manual and set the same f8 and 250 and take the same pix I get very different results. The auto pix looks overexposed and the one taken in manual mode is spot on.
Why?
Why?
Please be more specific. What do you mean by 'Auto'? Can you provide samples photos? Have you checked to see what differences there might be in exposure compensation, metering mode (spot, center-weighted avg., matrix)?
Aug 15, 2017 02:18:44 #
Madman wrote:
Please be more specific. What do you mean by 'Auto'? Can you provide samples photos? Have you checked to see what differences there might be in exposure compensation, metering mode (spot, center-weighted avg., matrix)?
I think that Madman might have a point. In auto the camera is probably averaging a different part of the scene but it a great example of why it pays to get familiar with other modes of your camera.
Aug 15, 2017 06:41:39 #
It's called the exposure triangle for a reason ... what is your ISO in the two images? If the camera is set to auto-ISO, you control only two corners of the triangle in Manual and need to manually set the ISO the same value as well ...
Aug 15, 2017 07:11:40 #
Aug 15, 2017 08:23:49 #
Exposure could be different using the same ISO with different exposure modalities. Matrix meters the whole frame and compensates the exposure. Center weighted and spot metering are more conventional and there is no exposure compensation, when done it is the operator who has compensated the exposure.
With digital the focus bracket in use determines the exposure for matrix metering. Placing the bracket in different areas of the frame renders different exposures.
Using matrix metering in AUTO at a fixed ISO should give you the same results if using matrix with manual.
With digital the focus bracket in use determines the exposure for matrix metering. Placing the bracket in different areas of the frame renders different exposures.
Using matrix metering in AUTO at a fixed ISO should give you the same results if using matrix with manual.
Aug 15, 2017 09:21:08 #
Aug 15, 2017 10:05:59 #
Aug 15, 2017 11:19:26 #
Thank-you. I'll double check but believe I had the ISO set to 1600 for both. Will have to check about difference in metering. I'll put some examples up this evening.
You guys are very helpful ....
You guys are very helpful ....
Aug 15, 2017 16:29:21 #
reddoorcullman wrote:
Thank-you. I'll double check but believe I had the ISO set to 1600 for both. Will have to check about difference in metering. I'll put some examples up this evening.
You guys are very helpful ....
You guys are very helpful ....
I checked my D7100 with manual set to 1/60 @ f/8 with 100 ISO which matched what my meter read for aperture priority. As expected, the histogram was the same.
Another possibility is that something changed between the two shots. An example that would "fool" the meter would be a white car passing through. I'm curious what you discover.
Aug 15, 2017 18:32:43 #
OK. The original problem was noticed between two photos of hickory nuts with thick, deep green leaves surrounding taken outside a little before sundown. A thunderstorm is coming through so these are inside, I had the ISO set at 1600, no flash. On "Auto" the camera read it needed to shoot it at 1/30 at f4, which is the better exposure (top pix). I immediately changed it to manual, set it at 1/30, f4 and confirmed ISO was 1600 (bottom pix). I focused on the same spot on the painting and metering for both was set on Center Weighted.
Aug 15, 2017 18:41:52 #
Aug 15, 2017 18:54:56 #
Please looks at the original pictures and read the data in the files and see if they match. If you don't have a program that will tell you this information then re-upload and check the "store original" box then members here on the hog can get that information.
I know something is obviously different not sure tell we get all the information.
I know something is obviously different not sure tell we get all the information.
Aug 15, 2017 19:06:36 #
reddoorcullman wrote:
OK. The original problem was noticed between two p... (show quote)
The main difference that I see between these 2 photos is white balance. I'll also estimate that there's a 1/4 - 1/2 stop difference in exposure. This exposure difference could be from the ever so slight camera movement between the to photos.
Since you chose not to post the photos in a manner that allows viewing the EXIF data, I have no way to confirm my guesses.
I'll make another WAG that somewhere, deep in the camera's menus, is a setting that is different from the manual mode to the auto mode that you used for the example posted, Probably a white balance setting.
Perhaps the white balance is set to AUTO when the camera is in the auto mode that you used, and white balance is set to specific white balance value when the camera is in the manual mode.
Performing a 'system reset' on your camera may - should - return all these values to their factory original settings and improve your results.
Good luck!
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