What happens if you try to pixel shift a long exposure with movement.

As we know the new A7riii has a pixel shift function, it takes 4 images moving the sensor around each time. When merged with special software it creates a large and very detailed image with huge dynamic range and great colour. Sony do however point out the limitations of this approach. If things move in the scene it won't really work so you need the camera on a tripod and have nothing move in the scene.

I thought I would put this to the test, as the images created when using pixel shift are awesome. Is the image totally destroyed by the movement or would it be usable?

While In Bruges for my birthday I decided to try this at night. below is the resulting image from the merged 4 pixel shifted images.

 So from this perspective the image looks kind of ok, if you shared this on insta people would be probably non the wiser, there's some strange coloured lighting going on that is immediately obvious but not much else.  24-70 f2.8 at 31mm, f4.5, iso100, 30 Secs

So from this perspective the image looks kind of ok, if you shared this on insta people would be probably non the wiser, there's some strange coloured lighting going on that is immediately obvious but not much else.

24-70 f2.8 at 31mm, f4.5, iso100, 30 Secs

 This is the pixel shifted image at 300%, the light wasn't ideal due to Belgian restaurant service being really slow. You can start to see some strangeness happening in the car door.

This is the pixel shifted image at 300%, the light wasn't ideal due to Belgian restaurant service being really slow. You can start to see some strangeness happening in the car door.

 This is pretty much the same section taken from a 3 shot HDR, you can see the difference in detail and the colour.

This is pretty much the same section taken from a 3 shot HDR, you can see the difference in detail and the colour.

 This is what happens if a car goes down the road, so light trails are out of the question.

This is what happens if a car goes down the road, so light trails are out of the question.

 A person moving doesn't work very well either.

A person moving doesn't work very well either.

 These men were fitting this fantastic sculpture late into the night, its about 10pm in this image. Their movement created more interesting artefacts in the image.

These men were fitting this fantastic sculpture late into the night, its about 10pm in this image. Their movement created more interesting artefacts in the image.

 This is an edited HDR with the same settings, is it worth fixing up a pixel shifted image if it has artefacts from movement. Probably not.

This is an edited HDR with the same settings, is it worth fixing up a pixel shifted image if it has artefacts from movement. Probably not.

So this is what happens if things move in your image, you get these strange artefacts. Im not sure what this would mean for cloud movement in the sky, it would probably create a massive mess. This would however work in certain circumstances with minimal movement and you could alway edit out the artefacts in post, colour matching may be difficult but not impossible. 

I won't use this in the majority of my shots but it does have its place and it was fun finding out.