GFX 16 Pixel Shift Artifacts

[madlantern]

I was recently trying out a GFX 100 II camera, and specifically, its 16 image pixel shift feature. I was using a 20-35 lens, on a tripod, by the side of the road.

I wouldn’t say it’s absolutely the most stable environment (I didn’t hang a weight on the bottom of the tripod to keep it stable, for instance) and there was a lot of traffic on the road. But it was still a relatively stable environment. In my cityscape shots, I don’t think it’d be convenient or practical to get any more stable than this.

But I noticed that for the pixel shift files, they all have a screen door like effect. What is causing this? Is this a matter of camera movement, or am I doing something wrong in post (never tried GFX cameras previously)



You can see it in the sky on the photo on the left (the right side is one of the component images from the 16 images series)

 

[CrispyBee]

What is causing this? Is this a matter of camera movement, or am I doing something wrong in post (never tried GFX cameras previously)

this:

I wouldn’t say it’s absolutely the most stable environment (I didn’t hang a weight on the bottom of the tripod to keep it stable, for instance) and there was a lot of traffic on the road.

Pixel shift requires an absolutely steady and vibration-free environment.

If a big truck was passing you by while you were taking an image, its vibrations are enough to cause issues.

 

[madlantern]

What is causing this? Is this a matter of camera movement, or am I doing something wrong in post (never tried GFX cameras previously)

this:

I wouldn’t say it’s absolutely the most stable environment (I didn’t hang a weight on the bottom of the tripod to keep it stable, for instance) and there was a lot of traffic on the road.

Pixel shift requires an absolutely steady and vibration-free environment.

If a big truck was passing you by while you were taking an image, its vibrations are enough to cause issues.

I know theoretically the pixel shift mode can only be used in absolutely stable environments.

But do the artefacts I'm seeing actually the result of small camera movements? In the sky, it's basically all just blue. So even if the camera moved slightly on a pixel level, why would that produce a strange grid pattern?

 

[SterlingBjorndahl]

Is this a matter of camera movement

Probably. One way to check is to use manual focus and zoom the Focus Check all the way in, with Stabilization turned off. If you can see the zoomed-in subject wiggling in the LCD/Viewfinder, your setup isn't stable enough for Pixel Shift. Outdoors I've only achieved successful pixel shift once, on a deserted road and with perfectly calm wind.

Best wishes,
Sterling
--
Lens Grit

 

[madlantern]

Is this a matter of camera movement

Probably. One way to check is to use manual focus and zoom the Focus Check all the way in, with Stabilization turned off. If you can see the zoomed-in subject wiggling in the LCD/Viewfinder, your setup isn't stable enough for Pixel Shift. Outdoors I've only achieved successful pixel shift once, on a deserted road and with perfectly calm wind.

Best wishes,
Sterling
--
Lens Grit

So basically pixel shift is not applicable for all cityscapes (even those with no obvious movement i.e. from trees or bushes)?

 

[JimKasson]

Is this a matter of camera movement

Probably. One way to check is to use manual focus and zoom the Focus Check all the way in, with Stabilization turned off. If you can see the zoomed-in subject wiggling in the LCD/Viewfinder, your setup isn't stable enough for Pixel Shift. Outdoors I've only achieved successful pixel shift once, on a deserted road and with perfectly calm wind.

Best wishes,
Sterling
--
Lens Grit

So basically pixel shift is not applicable for all cityscapes (even those with no obvious movement i.e. from trees or bushes)?

That is my experience.

 

[SrMi]

Haze can introduce slight subject "movement," which can also cause the artifacts.

Some assembly programs have motion artifact detection and replacement. The danger is that you don't know when and where the motion artifacts were replaced by upscaled data.