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Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed

  
 
DaveBurbank
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p.1 #1 · p.1 #1 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


Any theories about what would cause the horizontal banding you see here in the smoke pattern?

Sony a1 (ILCE-1)
Sony FE 70-200mm F2.8 GM OSS II with SEL TC 1.4x
ISO: 2500,
Aperture: 4
Electronic Shutter: 1/16,000
Natural sunlight

Is it related to way the data is written to the sensor?
Is it related to me using the electronic shutter?
Maybe the smoke appears and disappears so quickly the sensor writing isn't complete.

Your thoughts?

Thanks,

Dave







Mar 16, 2023 at 03:30 PM
RoamingScott
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p.1 #2 · p.1 #2 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


Is it possible that the muzzle flash was so fast that the camera "saw" it as a flicker of light similar to LED flicker? Usually banding is caused by inconsistent light sources.


Mar 16, 2023 at 03:47 PM
LiveShots
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p.1 #3 · p.1 #3 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


I've seen this before on bullet captures, when the object moves close to the shutter speed you will get these gaps in readout.


Mar 16, 2023 at 04:00 PM
LiveShots
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p.1 #4 · p.1 #4 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


The lines in the smoke are all horizontal so it's the sensor readout. The grooves near the muzzle are slightly curved which are the grooves carved into the bullet for the barrel.

I think you can just use a Gaussian blur on the smoke and it will clean it up nicely.



Mar 16, 2023 at 04:07 PM
 


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TGPhotography
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p.1 #5 · p.1 #5 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


The eshutter reads the sensor in horizontal blocks of pixels or lines. I think 9 or 18 lines at a time? Someone here will know the real answer. When things are moving really fast, this banding in blocks can show up on eshutter.

On the A9 this could cause hummingbird wings to look similar to the gunsmoke. Noise reduction software often helped smooth it out on the A9. The A1 sensor is faster and doesn’t show it for hummingbird wings. I imagine gunsmoke is moving even faster than hummingbird wings.



Mar 16, 2023 at 04:19 PM
jeffbuzz
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p.1 #6 · p.1 #6 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


RoamingScott wrote:
Is it possible that the muzzle flash was so fast that the camera "saw" it as a flicker of light similar to LED flicker? Usually banding is caused by inconsistent light sources.


Yes, I am wondering if the short duration muzzle blast is essentially acting as a flash with a really weird intensity curve. This is definitely a sync and e-shutter readout issue.

@DaveBurbank Did you try using mech shutter? How are you triggering the shutter?



Mar 16, 2023 at 04:34 PM
dclark
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p.1 #7 · p.1 #7 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


Take a look at this thread. https://www.fredmiranda.com/forum/topic/1663827
The same effect is present in the A1.



Mar 16, 2023 at 10:41 PM
skid00skid00
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p.1 #8 · p.1 #8 · Sony a1 Horizontal Banding 1/16,000 Second Shutter Speed


It almost appears that the LED light mounted under the pistol is on, too? They flicker at very high rates.


Mar 18, 2023 at 02:55 PM







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