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Is there something wrong with my 5DIII?
  
 
jorgegarcia
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p.1 #1 · Is there something wrong with my 5DIII?


I am not sure what is going on but some times this happens: iso 10,000, 1/5000, F1.2


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After stepping aside and trying again: iso 10,000, 1/5000, F1.2


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I am not sure what is going on and it has happened before when shooting a bright white object. Lens used is a 50L 1.2.

also the AF doesnt lock at all in low light. example: ISO 10000, 1/80, F1.2


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And the histogram:


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I've been shooting Pentax for a few years and feel that my k-5, although slow, would lock in low light situation like these. AF mode was single shot with expanded center focus point. all 9 center focus points.

TIA
Jorge


Jan 13, 2013 at 11:47 PM
bridow
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p.1 #2 · Is there something wrong with my 5DIII?


I use those exact settings to take action shots of ninjas in the dark all the time without a problem. Must be the sensor...


Jan 13, 2013 at 11:54 PM
snapsy
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p.1 #3 · Is there something wrong with my 5DIII?


With a shutter speed of 1/5000, the shutter curtains move in tandem, with only a slit open at any point in the image. Based on the width of that underexposed band and the tapering of its tone at the edges it almost looks like the curtains skipped over the center of the image too quickly. Does it only happen at fast shutter speeds? Is the underexposed band always in the center?


Jan 13, 2013 at 11:56 PM
EB-1
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p.1 #4 · Is there something wrong with my 5DIII?


Is it only with fluorescent lighting? You may be seeing the AC cycling of the lights.

EBH


Jan 14, 2013 at 12:07 AM
scalesusa
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p.1 #5 · Is there something wrong with my 5DIII?


What is the light source? It could be something as simple as catching the flicker of a light.


Jan 14, 2013 at 12:10 AM
jorgegarcia
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p.1 #6 · Is there something wrong with my 5DIII?


if ninjas do start jumping out at me in the dark, i want to make sure my camera can take their picture.

Half his face is lit. it should have locked on the left side of his face.

when i first encountered the issue, i thought it was the shutter speed too but that doesnt matter. I think it has something to due to bright white objects. here are three examples from when i was at the zoo. these were taken out doors at night.

ISO 800
Exposure 1/1600 sec
Aperture 1.2


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ISO 800
Exposure 1/2500 sec
Aperture 1.2


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ISO 800
Exposure 1/800 sec
Aperture 1.2


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Jan 14, 2013 at 12:19 AM
snapsy
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p.1 #7 · Is there something wrong with my 5DIII?


Those additional samples are also at shutter speeds above x-synch (meaning there will be a slitted shutter exposure) and all have a dark band that is parallel to the shutter curtains. Looks like a shutter issue to me.


Jan 14, 2013 at 12:39 AM
Monito
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p.1 #8 · Is there something wrong with my 5DIII?


It's AC voltage flicker in the first shot, due to using a high shutter speed. It's chance. Probably fluorescent or some variety of indoor mercury vapour lights.

The first photo almost certainly has illumination from several lights which are out of sync so that their cycles mostly overlap, but you caught a dip in one shot.

The LED penguins are being run off one circuit and being cycled in sync. Hence large swaths are off for part of the shot.
Jan 14, 2013 at 12:52 AM
Monito
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p.1 #9 · Is there something wrong with my 5DIII?


People talking about x-sync (flash photography): there is no evidence in the photos of flash having any effect, even if flash is enabled and connected (OP?) The LED penguins are lit by the LED with no ambient lighting.

It seems nonsensical to say flash, because flash problems would show up as a tiny slit way on one side and all the rest black, especially tiny at 1/5000 second.

Note how the penguins at 1/2500 has more illuminated than the 1/800 shot. You'd expect the opposite for flash.

The OP never said anything about using flash.


Jan 14, 2013 at 12:55 AM
Monito
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p.1 #10 · Is there something wrong with my 5DIII?


Jorge, why are you using such high shutter speeds and such wide apertures? It seems completely unnecessary and counter-productive in your situation. There seems to be no call for shallow depth of field in those pictures.

The first one at ISO 10,000, f/1.2, 1/5000 sec would probably be better shot at f/5.6 1/250.

What reasoning did you use to choose the exposure settings in your photos?


Jan 14, 2013 at 12:58 AM
 



Monito
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p.1 #11 · Is there something wrong with my 5DIII?


In the green man photo, the most contrasty part of the image is the far right edge of his neck. That's what the focus latched on to.

When you are shooting at f/1.2, you have to be very purposeful with your focus.

I think you may have enabled all the focus points in your camera or a large number of them.
Jan 14, 2013 at 01:00 AM
Monito
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p.1 #12 · Is there something wrong with my 5DIII?


I think the camera is fine and the problem is operator error, sorry to have to say it. However if our positions were reversed, I'd be glad for the opportunity to learn about technique, so see this as a chance to figure some things out and get better.
Jan 14, 2013 at 01:01 AM
EB-1
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p.1 #13 · Is there something wrong with my 5DIII?


Monito wrote:
It's AC voltage flicker in the first shot, due to using a high shutter speed. It's chance. Probably fluorescent or some variety of indoor mercury vapour lights.

The first photo almost certainly has illumination from several lights which are out of sync so that their cycles mostly overlap, but you caught a dip in one shot.

The LED penguins are being run off one circuit and being cycled in sync. Hence large swaths are off for part of the shot.


That's what I'm trying to get across, but I don't think the OP is listening. A tripod and a slow shutter speed would be better.

EBH


Jan 14, 2013 at 01:02 AM
snapsy
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p.1 #14 · Is there something wrong with my 5DIII?


Monito wrote:
People talking about x-sync (flash photography): there is no evidence in the photos of flash having any effect, even if flash is enabled and connected (OP?) The LED penguins are lit by the LED with no ambient lighting.

It seems nonsensical to say flash, because flash problems would show up as a tiny slit way on one side and all the rest black, especially tiny at 1/5000 second.

Note how the penguins at 1/2500 has more illuminated than the 1/800 shot. You'd expect the opposite for flash.

The OP never said anything about using flash.

Nobody said anything about flash. Besides x-synch being the speed relevant for flash exposures, it also defines the speed at which the shutter curtains move I'm tandem for a rolling exposure, which can create the slit effect when the curtains aren't moving at a constant or correct velocity.


Jan 14, 2013 at 01:07 AM
snapsy
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p.1 #15 · Is there something wrong with my 5DIII?


EB-1 wrote:
Monito wrote:
It's AC voltage flicker in the first shot, due to using a high shutter speed. It's chance. Probably fluorescent or some variety of indoor mercury vapour lights.

The first photo almost certainly has illumination from several lights which are out of sync so that their cycles mostly overlap, but you caught a dip in one shot.

The LED penguins are being run off one circuit and being cycled in sync. Hence large swaths are off for part of the shot.


That's what I'm trying to get across, but I don't think the OP is listening. A tripod and a slow shutter speed would be better.

EBH

If the dark band was the result of cycling LEDs then the orientation of the band wouldn't follow the orientation of the shutter curtains between the photos taken at landscape vs portrait.


Jan 14, 2013 at 01:10 AM
EB-1
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p.1 #16 · Is there something wrong with my 5DIII?


I think we are seeing the interference of the light cycling and the portion of the slit open (a movement across the short dimension of the frame). If there were a mechanical problem with the shutter it would not occur at different places in different shots.

EBH


Jan 14, 2013 at 01:15 AM
jorgegarcia
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p.1 #17 · Is there something wrong with my 5DIII?


i was just surprised as i have never encountered this. i have been shooting for a few years now, pentax kx, 2 k5s, sony rx100, various 35mm and medium format cameras and have never seen this happen. as to why i chose the settings i did was simply to play with iso 10000+ and f 1.2. i just wanted to see how the camera and myself handled the high iso and dof. i know 1.2 is hard to achieve focus with so i try to shot at 1.2 as often as possible just to practice. ive only had the camera and lens just a few weeks.


Jan 14, 2013 at 01:18 AM
elluDe
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p.1 #18 · Is there something wrong with my 5DIII?


I don't know what is causing the problem with the dark area, but you have made strange choices with the settings. Surely you'd be better to reduce ISO, lower your shutter speed and close down your lens a bit...?

I'd only shoot at ISO 10,000 for extreme night-time situations, and even then reluctantly.
Jan 14, 2013 at 01:25 AM
jorgegarcia
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p.1 #19 · Is there something wrong with my 5DIII?


Let's not get side tracked here with why I chose x settings. These pics are for shits and giggles. Thank you to those trying to help me out.


Jan 14, 2013 at 01:29 AM
snapsy
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p.1 #20 · Is there something wrong with my 5DIII?


EB-1 wrote:
I think we are seeing the interference of the light cycling and the portion of the slit open (a movement across the short dimension of the frame). If there were a mechanical problem with the shutter it would not occur at different places in different shots.

EBH

I'm thinking the shutter curtains are cycling at inconsistent speeds, and if so could happen at any point of the exposure. Notice how the width of the dark band varies with shutter speed, roughly matching the expected size of the shutter slit at that speed.


Jan 14, 2013 at 01:31 AM
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