Open Gate video sensor

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bobn2
Team 2157 posts

March 12, 2024, 12:51 p.m. March 12, 2024, 12:51 p.m.
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@finnan has written:

Open Gate has no influence on how the sensor is scanned.

It has some influence, because the window that is scanned has more lines to scan. The scan rate is per line - with fewer lines to scan a frame can be scanned quicker. That said, when you crop it, the scan time within the crop will be just the same
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finnan
Members 206 posts

March 12, 2024, 7 p.m. March 12, 2024, 7 p.m.
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@bobn2 has written:

@finnan has written:

Open Gate has no influence on how the sensor is scanned.

It has some influence, because the window that is scanned has more lines to scan. The scan rate is per line - with fewer lines to scan a frame can be scanned quicker. That said, when you crop it, the scan time within the crop will be just the same

Open Gate doesn't change video frame rate, though on a non-global shutter sensor the read time per frame is somewhat higher.

The point i'm trying to make:
Open Gate is independent from camera orientation (regardless if it's held 0° or +-90°).

@finnan has written:

Rolling shutter and Open Gate have very little connection, just when reading more lines of the sensor the skewing gets worse.
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bobn2
Team 2157 posts

March 12, 2024, 7:18 p.m. March 12, 2024, 7:18 p.m.
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@finnan has written:

The point i'm trying to make:
Open Gate is independent from camera orientation (regardless if it's held 0° or +-90°).

Doesn't the weight of the pixels make a difference? 😉
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DonaldB
Members 2104 posts

March 12, 2024, 8:41 p.m. March 12, 2024, 8:41 p.m.
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@JohnSheehyRev has written:

@DonaldB has written:

@finnan has written:

Like most Alphas, for A9 there’s no Open Gate or higher video resolutions for cropping in post.

Rolling shutter and Open Gate have very little connection, just when reading more lines of the sensor the skewing gets worse .

If you don't have rolling shutter problems, then you don't need global shutter. 😁

its not the point im making . open gate is a square sensor so you can crop the sensor to the frame size you want and have no rolling shutter because you just select the scan to travel at 90 deg to a normal sensor.

You've rotated the direction of the roll, but it is still rolling. Do you think a fan blade will care what orientation your roll has? A pan will be either compressed or expanded, instead of tilted. That may be a little bit less objectionable, but it is still a distortion.

think about what you just posted, lets reference a light pole or fence post which is what reviewers always post as their point of reference. how much less distortion in a percentage would you say shooting vertical would make 😊
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JohnSheehyRev
Members 511 posts
March 12, 2024, 9:35 p.m. March 12, 2024, 9:35 p.m.
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@DonaldB has written:

@JohnSheehyRev has written:

@DonaldB has written:

@finnan has written:

Like most Alphas, for A9 there’s no Open Gate or higher video resolutions for cropping in post.

Rolling shutter and Open Gate have very little connection, just when reading more lines of the sensor the skewing gets worse .

If you don't have rolling shutter problems, then you don't need global shutter. 😁

its not the point im making . open gate is a square sensor so you can crop the sensor to the frame size you want and have no rolling shutter because you just select the scan to travel at 90 deg to a normal sensor.

You've rotated the direction of the roll, but it is still rolling. Do you think a fan blade will care what orientation your roll has? A pan will be either compressed or expanded, instead of tilted. That may be a little bit less objectionable, but it is still a distortion.

think about what you just posted, lets reference a light pole or fence post which is what reviewers always post as their point of reference. how much less distortion in a percentage would you say shooting vertical would make 😊

I already addressed what would happen panning in the same dimension as the roll: compression, or expansion. So, instead of:

o o o o o o o o o o o o you might get: o o o o o o o o horizontally compressed o o o o or: o o o o o o o o horizontally expanded o o o o instead of: o o o o o o o o o o o o
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ArvoJ
Team 428 posts
March 12, 2024, 9:48 p.m. March 12, 2024, 9:48 p.m.
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@JohnSheehyRev has written:

o o o o o o o o o o o o

Human eye is very sensitive to angle, but corrects size (compression-expansion) pretty well - in this sense yes, panning horisontally with rotated sensor makes different and less noticeable distortion for vertical objects than using normally oriented sensor.

For rotating fan blades there won't be any difference. Evidently Donald B prefers light poles to rotating fans :)
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DonaldB
Members 2104 posts
March 12, 2024, 10:25 p.m. March 12, 2024, 10:25 p.m.
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@JohnSheehyRev has written:

@DonaldB has written:

@JohnSheehyRev has written:

@DonaldB has written:

@finnan has written:

Like most Alphas, for A9 there’s no Open Gate or higher video resolutions for cropping in post.

Rolling shutter and Open Gate have very little connection, just when reading more lines of the sensor the skewing gets worse .

If you don't have rolling shutter problems, then you don't need global shutter. 😁

its not the point im making . open gate is a square sensor so you can crop the sensor to the frame size you want and have no rolling shutter because you just select the scan to travel at 90 deg to a normal sensor.

You've rotated the direction of the roll, but it is still rolling. Do you think a fan blade will care what orientation your roll has? A pan will be either compressed or expanded, instead of tilted. That may be a little bit less objectionable, but it is still a distortion.

think about what you just posted, lets reference a light pole or fence post which is what reviewers always post as their point of reference. how much less distortion in a percentage would you say shooting vertical would make 😊

I already addressed what would happen panning in the same dimension as the roll: compression, or expansion. So, instead of:

o o o o o o o o o o o o you might get: o o o o o o o o horizontally compressed o o o o or: o o o o o o o o horizontally expanded o o o o instead of: o o o o o o o o o o o o

you didnt answer my question, and what you posted is not correct. you have made a guess. try again
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DonaldB
Members 2104 posts
March 12, 2024, 10:36 p.m. March 12, 2024, 10:36 p.m.
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@ArvoJ has written:

@JohnSheehyRev has written:

o o o o o o o o o o o o

Human eye is very sensitive to angle, but corrects size (compression-expansion) pretty well - in this sense yes, panning horisontally with rotated sensor makes different and less noticeable distortion for vertical objects than using normally oriented sensor.

For rotating fan blades there won't be any difference. Evidently Donald B prefers light poles to rotating fans :)

so im a portrait shooter and most sports magazine images are vertical. so shooting electronic shutter in portrait mode there is no rolling shutter effect, my a74 and my a6300 have enough pixels on the shortest side to capture 4k video and make use of open gate so why dont we have this feature. why dont reviewers actually show there is NO rolling shutter in portrait mode. i can tell you why because they all arnt as smart as they like to think, and cant think outside the square 😏🙄
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finnan
Members 206 posts

March 12, 2024, 10:48 p.m. March 12, 2024, 10:48 p.m.
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@bobn2 has written:

@finnan has written:

The point i'm trying to make:
Open Gate is independent from camera orientation (regardless if it's held 0° or +-90°).

Doesn't the weight of the pixels make a difference? 😉

Yeah sure, but only if you leave the gate open! 🙃😁