Open Gate video sensor

i was talking to a camera store sales guy this morning about the sony a93 and we got onto the subject of open gate
and the advantages of no rolling shutter because you can crop a 6k sensor to 4k and spin the frame around 90 deg so there is no rolling shutter
distortion. anyone like to comment on the subject . is that how a open gate sensor can be used.

I have a used car you might like to buy...

as consumers we are so conned by manufacturers . so i thought id test the concept with my a6300 that i have with me. and just for the record rolling shutter is not a problem in the first place for fast panning. anyway i shot a video at 60 frames hd in landscape mode and there was a very slight wobble , then i shot a video on portrait mode 😁 what a joke it was just as good as global shutter .

HAND.

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.

HAND.

your gh6 is a toy camera.
quote of a real cine camera "Open Gate is a term used primarily in filmmaking, specifically referring to the full sensor readout of a camera. With Open Gate, the entire sensor area is used. This gives you a large, almost square frame"

thats what i was wondering. but with the test i did with my a6300 the cloths line pole did not change size by a very quick pan back and forth

Just so they can then crop it to 2.32:1 or whatever flavour of anamorphic they want.

Most cine camera sensors are going to be 16:9 or something closer to the output they want.

Your quote re Open Gate is correct up until you added the "square" bit.

And which theatres do you go to to see these square films?

You need to pan faster. Rolling shutter is a function of read out time.

Lets say your sensor reads out a line left to right, then all the lines top to bottom. It starts top left finishes bottom right. Picture that diagonal. Now turn your camera clockwise 90 degrees. It will be reading out from top right corner to bottom left. The other diagonal. Now imagine a fast moving object travelling across the field of view. Which orientation will give you no rolling shutter?

but its not reading a diagonal

I never said it's reading a diagonal. It was intended as a reference to try and help you see what would happen.

Sometimes we don't see the wood from the trees because we (our minds) move too fast. It never hurts to slow down and take in some detail.

HAND.

if you turn a square sensor to the vertical position than its scanning sideways not up and down. so no rolling shutter effect.

just tried it with my phone ,rolling shutter horizontal video recording, no rolling shutter vertical 😊😎

If you slow down and think about what is actually happening, you would realise that your test is not absolute. And while it's possible to see what you see, it is an isolated case and not definitive.

my a6300 does the same

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.