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Archive 2024Call for help - building sensor readout speed database
p.4 #1Call for help - building sensor readout speed database
snapsy wrote:
There are two factors at play here. First, by using a slower shutter speed relative to the light cycling frequency, each sensor row is capturing multiple cycles of light. This means the brightness difference of the bands between rows receiving +1 or -1 cycles vs other rows is less noticeable. For example, on a light source cycling 1,000 times/sec, a 1/8000 shutter will capture on average 1 cycle of light, meaning some rows will have 100% and others 0% - a very noticeable 100% difference. Drop the shutter down to 1/250 and some rows get 4 cycles while others get...Show more →
To demonstrate this effect of shutter speed more clearly I've set up my Arduino with two LEDs, a red and a green, and alternate between the two every millisecond (1/1000).
https://photos.smugmug.com/photos/i-TRxJGCh/0/CgfHKTD2S8XzVJmjTbBsWpm8MkFR2nLX5vv3xc6mm/O/i-TRxJGCh.jpg
There are two factors at play here. First, by using a slower shutter speed relative to the light cycling frequency, each sensor row is capturing multiple cycles of light. This means the brightness difference of the bands between rows receiving +1 or -1 cycles vs other rows is less noticeable. For example, on a light source cycling 1,000 times/sec, a 1/8000 shutter will capture on average 1 cycle of light, meaning some rows will have 100% and others 0% - a very noticeable 100% difference. Drop the shutter down to 1/250 and some rows get 4 cycles while others get...Show more →
To demonstrate this effect of shutter speed more clearly I've set up my Arduino with two LEDs, a red and a green, and alternate between the two every millisecond (1/1000).
https://photos.smugmug.com/photos/i-TRxJGCh/0/CgfHKTD2S8XzVJmjTbBsWpm8MkFR2nLX5vv3xc6mm/O/i-TRxJGCh.jpg
Mar 10, 2024 at 07:46 PM
p.4 #2Call for help - building sensor readout speed database
Add Canon R5 and R7 - huge thanks to @RAF09 for some setup issues that were my fault, including some missing video measurements that will be filled in later
Added Sony ZV-E1 - big thanks to @circular
I also added per-row sensor readout rates, in addition to the existing full-sensor rates. The per-row rates make it easier to compare readout speeds across sensors with different resolutions.
https://horshack-dpreview.github.io/RollingShutter/
Added Sony ZV-E1 - big thanks to @circular
I also added per-row sensor readout rates, in addition to the existing full-sensor rates. The per-row rates make it easier to compare readout speeds across sensors with different resolutions.
https://horshack-dpreview.github.io/RollingShutter/
Mar 10, 2024 at 09:03 PM
p.4 #3Call for help - building sensor readout speed database
Added Fuji X100V. Thanks again to @circular!
https://horshack-dpreview.github.io/RollingShutter/
https://horshack-dpreview.github.io/RollingShutter/
Mar 11, 2024 at 05:19 AM
p.4 #4Call for help - building sensor readout speed database
Surprisingly, no one sign up to test A7 IV yet? I think this is a very popular model.
Mar 11, 2024 at 08:56 AM
p.4 #5Call for help - building sensor readout speed database
I will be testing the A7 IV later this week along with a host of other cameras.
Mar 12, 2024 at 12:11 AM
p.4 #6Call for help - building sensor readout speed database
snapsy wrote:
Add Canon R5 and R7 - huge thanks to @RAF09@ for some setup issues that were my fault, including some missing video measurements that will be filled in later
Added Sony ZV-E1 - big thanks to @circular@
I also added per-row sensor readout rates, in addition to the existing full-sensor rates. The per-row rates make it easier to compare readout speeds across sensors with different resolutions.
https://horshack-dpreview.github.io/RollingShutter/
Regarding pre-row readout, I think one thing worth mentioning is that stacked sensors tend to read a group of rows at the same time but I don't remember the details...
Add Canon R5 and R7 - huge thanks to @RAF09@ for some setup issues that were my fault, including some missing video measurements that will be filled in later
Added Sony ZV-E1 - big thanks to @circular@
I also added per-row sensor readout rates, in addition to the existing full-sensor rates. The per-row rates make it easier to compare readout speeds across sensors with different resolutions.
https://horshack-dpreview.github.io/RollingShutter/
Regarding pre-row readout, I think one thing worth mentioning is that stacked sensors tend to read a group of rows at the same time but I don't remember the details...
Mar 12, 2024 at 03:31 AM
p.4 #7Call for help - building sensor readout speed database
j4nu wrote:
Added Sony ZV-E1 - big thanks to @circular@@
I also added per-row sensor readout rates, in addition to the existing full-sensor rates. The per-row rates make it easier to compare readout speeds across sensors with different resolutions.
https://horshack-dpreview.github.io/RollingShutter/Regarding pre-row readout, I think one thing worth mentioning is that stacked sensors tend to read a group of rows at the same time but I don't remember the details...
Yep, I'm working on ideas on how to measure multi-row readouts.
snapsy wrote
Add Canon R5 and R7 - huge thanks to @RAF09@@ for some setup issues that were my fault, including some missing video measurements that will be filled in laterAdded Sony ZV-E1 - big thanks to @circular@@
I also added per-row sensor readout rates, in addition to the existing full-sensor rates. The per-row rates make it easier to compare readout speeds across sensors with different resolutions.
https://horshack-dpreview.github.io/RollingShutter/
Yep, I'm working on ideas on how to measure multi-row readouts.
Mar 12, 2024 at 06:28 AM
p.4 #8Call for help - building sensor readout speed database
Good project. Have you thought about adding milliseconds as well? Not sure if that would be of any help to anyone. From Duade Patton and just estimates so not intended to be added to your project.
Mar 12, 2024 at 08:16 AM
p.4 #9Call for help - building sensor readout speed database
Zenon Char wrote:
Good project. Have you thought about adding milliseconds as well? Not sure if that would be of any help to anyone. From Duade Patton and just estimates so not intended to be added to your project.
The live results table lets you switch between milliseconds and seconds. Under that are static tables for both seconds and milliseconds.
Good project. Have you thought about adding milliseconds as well? Not sure if that would be of any help to anyone. From Duade Patton and just estimates so not intended to be added to your project.
The live results table lets you switch between milliseconds and seconds. Under that are static tables for both seconds and milliseconds.
Mar 12, 2024 at 08:19 AM
p.4 #10Call for help - building sensor readout speed database
snapsy wrote:
The live results table lets you switch between milliseconds and seconds. Under that are static tables for both seconds and milliseconds.
Thanks.
Zenon Char wrote
Good project. Have you thought about adding milliseconds as well? Not sure if that would be of any help to anyone. From Duade Patton and just estimates so not intended to be added to your project.Thanks.
Mar 12, 2024 at 08:44 AM
p.4 #11Call for help - building sensor readout speed database
Here's a capture of the Z9's multiple concurrent row readout scheme:
https://photos.smugmug.com/photos/i-H4ZbDb3/0/Dp7tRbjBwgK3LsW5nk3jZDVT7s2nz5mXc5ZxD2N5q/O/i-H4ZbDb3.png
The built-in LED on the Arduino board I'm using isn't bright enough for this capture - the noise averages out the 12-row segments. This image was captured with two discrete LED's (red+blue) plugged into GPIO pins through a 220 Ohm resistor.
Jim Kasson has previously measured the same on both the Z9 and A9.
https://photos.smugmug.com/photos/i-H4ZbDb3/0/Dp7tRbjBwgK3LsW5nk3jZDVT7s2nz5mXc5ZxD2N5q/O/i-H4ZbDb3.png
The built-in LED on the Arduino board I'm using isn't bright enough for this capture - the noise averages out the 12-row segments. This image was captured with two discrete LED's (red+blue) plugged into GPIO pins through a 220 Ohm resistor.
Jim Kasson has previously measured the same on both the Z9 and A9.
Mar 12, 2024 at 10:29 AM
p.4 #12Call for help - building sensor readout speed database
Fuji X100VI added, special thanks to @AZ Photo!
https://horshack-dpreview.github.io/RollingShutter/
https://horshack-dpreview.github.io/RollingShutter/
Mar 13, 2024 at 10:54 AM
p.4 #13Call for help - building sensor readout speed database
Sony reads out 12 rows and Canon 8 rows, and can produce noticeable image artifacts. https://www.fredmiranda.com/forum/topic/1663827/0
It would be interesting to see if the Canon R3 is still using 8 rows.
It would be interesting to see if the Canon R3 is still using 8 rows.
Mar 13, 2024 at 11:17 AM
p.4 #14Call for help - building sensor readout speed database
j4nu wrote:
Regarding pre-row readout, I think one thing worth mentioning is that stacked sensors tend to read a group of rows at the same time but I don't remember the details...
I don't think it's just stacked sensors. I believe the below was shot with the non-stacked Canon R6 and definitely in e-shutter. The higher magnification screen grab shows the readout rows more clearly. The original image was a vertical, which is why the bands are vertical.
Mar 14, 2024 at 07:44 PM
p.4 #15Call for help - building sensor readout speed database
Canon R6 added, special thanks to @mrdan86!
https://horshack-dpreview.github.io/RollingShutter/
https://horshack-dpreview.github.io/RollingShutter/
Mar 15, 2024 at 03:23 AM
p.4 #16Call for help - building sensor readout speed database
Awesome idea/ project.
Why not take a trip to keh, adorama, or some store with a used section and knock out a bunch of cameras?
Why not take a trip to keh, adorama, or some store with a used section and knock out a bunch of cameras?
Mar 15, 2024 at 09:35 AM
p.4 #17Call for help - building sensor readout speed database
well69 wrote:
Awesome idea/ project.
Why not take a trip to keh, adorama, or some store with a used section and knock out a bunch of cameras?
That's a great idea. Unfortunately I don't live close to a store with a used supply.
Awesome idea/ project.
Why not take a trip to keh, adorama, or some store with a used section and knock out a bunch of cameras?
That's a great idea. Unfortunately I don't live close to a store with a used supply.
Mar 15, 2024 at 01:34 PM
p.4 #18Call for help - building sensor readout speed database
Canon R6M2 added, special thanks again to @mrdan86!
https://horshack-dpreview.github.io/RollingShutter/
https://horshack-dpreview.github.io/RollingShutter/
Mar 15, 2024 at 01:34 PM
p.4 #19Call for help - building sensor readout speed database
Sony A7M4 added, special thanks yet again to @mrdan86!
https://horshack-dpreview.github.io/RollingShutter/
https://horshack-dpreview.github.io/RollingShutter/
Mar 15, 2024 at 02:34 PM
p.4 #20Call for help - building sensor readout speed database
Fuji XT-2 added, super special thanks yet again to @mrdan86!
https://horshack-dpreview.github.io/RollingShutter/
https://horshack-dpreview.github.io/RollingShutter/
Mar 15, 2024 at 06:33 PM