Two photos taken milliseconds apart, identical terms - why the difference?

Actually, scrolling through, it's a very large percentage of my photos... :-(

Did you have some sort of bracketing going on you think?

Edit: nvm, that would reflect in the shown camera settings. Even if the camera metered differently for each shot, that would have still shown in the camera settings (either through shutter, iso, aperture etc).

i have not a clue.

Also were you shooting in electronic shutter or something else?

Maybe you have a failing mechanical shutter. Compare a sequence with mechanical shutter to one with electronic shutter.

Can you post the exif data?

CameraCarl said:

Can you post the exif data?

Click to expand...

Hover over the photos to see that.

MichaelRH said:

Hi,

I took photos today at an airshow. why are some so dark? Never seen this before and it's the minority of photos I took today, Many thanks,

Click to expand...

Wow, exif is pretty much identical except for the 1 second difference in capture time.

I am not sure if the exif captures whether it was mech or electronic shutter, which was it?

Did you have a filter on?

MichaelRH said:

Click to expand...

Ali said:

MichaelRH said:

Hi,

I took photos today at an airshow. why are some so dark? Never seen this before and it's the minority of photos I took today, Many thanks,

Click to expand...

Wow, exif is pretty much identical except for the 1 second difference in capture time.

I am not sure if the exif captures whether it was mech or electronic shutter, which was it?

Did you have a filter on?

Click to expand...

Hi, thanks for asking. Shutter mode: electronic 1st curtain

No filter.

Looking at them all know (~1,700 photos), i would say a 60-70% just "jump' to underexposed even when I keep my finger on pressed. It's not that I stopped and started taking pictures; it;s as I am taking them. I did notice yesterday, now that I think about it, that I had around 8-10 very OVERexposed photos all in a row. It stopped and now only underexposed.

Gutted that on a perfect summer's day, most of my shots are ruined...

Ali said:

Ali said:

Click to expand...

Click to expand...

CameraCarl said:

Can you post the exif data?

Click to expand...

Thank you. Please see below

Properly exposed photo:

Aperture Value: 5.625
Body Serial Number: 042021005406
Camera Owner Name: Michael Rurik Halaby
Colour Space: sRGB
Components Configuration: 1, 2, 3, 0
Custom Rendered: Normal process
Date Time Digitised: 19 Jul 2024 at 14:21:00
Date Time Original: 19 Jul 2024 at 14:21:00
Exif Version: 2.3.1
Exposure Bias Value: 0.667
Exposure Mode: Auto exposure
Exposure Program: Shutter priority
Exposure Time: 1/2000
Flash: No Flash
FlashPix Version: 1.0
FNumber: 7.1
Focal Length: 500
Focal Plane Resolution Unit: inches
Focal Plane X Resolution: 5,773.08
Focal Plane Y Resolution: 5,769.799
Photographic Sensitivity (ISO): 100
Lens Model: RF100-500mm F4.5-7.1 L IS USM
Lens Serial Number: 9103000489
Lens Specification: 100, 500, 0, 0
Max Aperture Value: 7.127
Metering Mode: Pattern
Time Zone for Modification Date: +01:00
Time Zone for Digitised Date: +01:00
Time Zone for Original Date: +01:00
Pixel X Dimension: 8,192
Pixel Y Dimension: 5,464
RecommendedExposureIndex: 100
Scene Capture Type: Standard
Sensitivity Type: Recommended exposure index (REI)
Shutter Speed Value: 1/2048
Sub-second Time: 03
Sub-second Time Digitised: 03
Sub-second Time Original: 03
White Balance: Auto white balance
Firmware: Firmware Version 2.0.0
Flash Compensation: 0
Focus Mode: AI Servo AF
Image Stabilisation: Panning
Lens ID: 61,182
Lens Info: 100, 500, 0, 0
Lens Model: Canon RF100-500mm F4.5-7.1 L IS USM

Underexposed photo:

Aperture Value: 5.625
Body Serial Number: 042021005406
Camera Owner Name: Michael Rurik Halaby
Colour Space: sRGB
Components Configuration: 1, 2, 3, 0
Custom Rendered: Normal process
Date Time Digitised: 19 Jul 2024 at 14:21:01
Date Time Original: 19 Jul 2024 at 14:21:01
Exif Version: 2.3.1
Exposure Bias Value: 0.667
Exposure Mode: Auto exposure
Exposure Program: Shutter priority
Exposure Time: 1/2000
Flash: No Flash
FlashPix Version: 1.0
FNumber: 7.1
Focal Length: 500
Focal Plane Resolution Unit: inches
Focal Plane X Resolution: 5,773.08
Focal Plane Y Resolution: 5,769.799
Photographic Sensitivity (ISO): 100
Lens Model: RF100-500mm F4.5-7.1 L IS USM
Lens Serial Number: 9103000489
Lens Specification: 100, 500, 0, 0
Max Aperture Value: 7.127
Metering Mode: Pattern
Time Zone for Modification Date: +01:00
Time Zone for Digitised Date: +01:00
Time Zone for Original Date: +01:00
Pixel X Dimension: 8,192
Pixel Y Dimension: 5,464
RecommendedExposureIndex: 100
Scene Capture Type: Standard
Sensitivity Type: Recommended exposure index (REI)
Shutter Speed Value: 1/2048
Sub-second Time: 52
Sub-second Time Digitised: 52
Sub-second Time Original: 52
White Balance: Auto white balance
Firmware: Firmware Version 2.0.0
Flash Compensation: 0
Focus Mode: AI Servo AF
Image Stabilisation: Panning
Lens ID: 61,182
Lens Info: 100, 500, 0, 0
Lens Model: Canon RF100-500mm F4.5-7.1 L IS USM

Victor Engel said:

Maybe you have a failing mechanical shutter. Compare a sequence with mechanical shutter to one with electronic shutter.

Click to expand...

Thank you. Will try that tomorrow. As I use for fast moving aircraft at a distance, I am worried mechanical will be too slow (12 tsp) and slap. But will do for a test.

Tr3v420 said:

Also were you shooting in electronic shutter or something else?

Click to expand...

Electronic 1st curtain.

To be clear:

It seems to me from the EXIFs that the two images were taken with the same exposure time, f/stop, ISO, and exposure offset.

Is that correct?

BobKnDP said:

To be clear:

It seems to me from the EXIFs that the two images were taken with the same exposure time, f/stop, ISO, and exposure offset.

Is that correct?

Click to expand...

That is correct. I took a burst of 8 photos. See screen shot. It just went underexposed halfway through despite me doing nothing.

The first two tings that come to mind:

ALO - do you have tis enabled? This can "interpret" how bright to make an image, rather than the normal deterministic conversion.

Your lens' aperture control motor is on its way out.

I said:

The first two tings that come to mind:

ALO - do you have tis enabled? This can "interpret" how bright to make an image, rather than the normal deterministic conversion.

Your lens' aperture control motor is on its way out.

Click to expand...

In addition to ALO, there is also "HTP+" in the newer cameras. I don't know exactly ow it works, but it may alter conversion under certain conditions. The brightness is so far off, however, that it may well be the aperture motor. You can test that by shooting something close and seeing if the background blur changes with brightness.

MichaelRH said:

Ali said:

MichaelRH said:

Hi,

I took photos today at an airshow. why are some so dark? Never seen this before and it's the minority of photos I took today, Many thanks,

Click to expand...

Wow, exif is pretty much identical except for the 1 second difference in capture time.

I am not sure if the exif captures whether it was mech or electronic shutter, which was it?

Did you have a filter on?

Click to expand...

Hi, thanks for asking. Shutter mode: electronic 1st curtain

No filter.

Looking at them all know (~1,700 photos), i would say a 60-70% just "jump' to underexposed even when I keep my finger on pressed. It's not that I stopped and started taking pictures; it;s as I am taking them. I did notice yesterday, now that I think about it, that I had around 8-10 very OVERexposed photos all in a row. It stopped and now only underexposed.

Gutted that on a perfect summer's day, most of my shots are ruined...

Click to expand...

sorry to hear that, hopefully you got enough good shots… Also sorry that this may turn out to be a problem requiring repair!

MichaelRH said:

MichaelRH said:

MichaelRH said:

Click to expand...

Click to expand...

Click to expand...

MichaelRH said:

Victor Engel said:

Maybe you have a failing mechanical shutter. Compare a sequence with mechanical shutter to one with electronic shutter.

Click to expand...

Thank you. Will try that tomorrow. As I use for fast moving aircraft at a distance, I am worried mechanical will be too slow (12 tsp) and slap. But will do for a test.

Click to expand...

Mechanical is the same speed as electronic first curtain, which you said you used for these shots. Both are limited to 12fps on the R5. If by 'slap' you mean shutter shock, don't worry. The shots you showed were at 1/2000. That's much too fast to get shutter shock, which only shows up, if at all, at slower than 1/250.

MichaelRH said:

BobKnDP said:

To be clear:

It seems to me from the EXIFs that the two images were taken with the same exposure time, f/stop, ISO, and exposure offset.

Is that correct?

Click to expand...

That is correct. I took a burst of 8 photos. See screen shot. It just went underexposed halfway through despite me doing nothing.

Click to expand...

Then some of the suggestions here (metering, etc.) seem to be off the mark.

MichaelRH said:

Ali said:

MichaelRH said:

Hi,

I took photos today at an airshow. why are some so dark? Never seen this before and it's the minority of photos I took today, Many thanks,

Click to expand...

Wow, exif is pretty much identical except for the 1 second difference in capture time.

I am not sure if the exif captures whether it was mech or electronic shutter, which was it?

Did you have a filter on?

Click to expand...

Hi, thanks for asking. Shutter mode: electronic 1st curtain

No filter.

Looking at them all know (~1,700 photos), i would say a 60-70% just "jump' to underexposed even when I keep my finger on pressed. It's not that I stopped and started taking pictures; it;s as I am taking them. I did notice yesterday, now that I think about it, that I had around 8-10 very OVERexposed photos all in a row. It stopped and now only underexposed.

Gutted that on a perfect summer's day, most of my shots are ruined...

Click to expand...

They're probably not ruined. That sensor has plenty of leeway. I downloaded the JPEG, opened it in LR, hit "auto", then added another couple of stops (so it's boosted 2.5 stops). This is the result:





This was a quick and dirty adjustment on the JPEG you posted. I'm sure you can do a lot better with the RAW files.

MichaelRH said:

MichaelRH said:

MichaelRH said:

Click to expand...

Click to expand...

Click to expand...

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