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Olympus OM-D E-M1 Mark II The second Micro Four Thirds camera that offers phase detect focusing so you can use Four Thirds DSLR lenses normally as well a Micro Four Thirds lenses.

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Old 15th May 2018
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Stacking in camera, some lenses will, some won't...why is that?

The lenses that stack in camera are the Pro and macro ones.
All lenses can perform focus bracketing in camera.....I think.

As stacking is just a series of focus bracketed shots combined, why then don't all lenses stack in camera.

Whats so special about the Pro and macro lenses?

My 40-150 cheapy will not stack, stacking is greyed out, but it will bracket up to 99 shots.
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Old 15th May 2018
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Re: Stacking in camera, some lenses will, some won't...why is that?

Just a guess here - but it's one of two things...

1. the accuracy of the stepper motors in the lens to allow the stacking (lower accuracy lenses will need more processing)
2. Its a marketing ploy to sell more PRO lenses
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Old 15th May 2018
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Re: Stacking in camera, some lenses will, some won't...why is that?

Perhaps more importantly:
3. Some lenses change focal length somewhat as they change focus. This particularly applies close up. It prevents good stacking results as the images don't accurately align on top of each other. I think the camera includes the data for the lenses it supports, so it can resize each image based on the lens, and the focus distance. Or perhaps that data has been added to the firmware in those lenses.

See this link for an explanation: https://www.cambridgeincolour.com/forums/thread2411.htm

Users would complain if the stacking was poor, and with some lenses in some situations it would be.

Stacking on a computer may allow more processing, using resizing as well as alignment, to cater for this problem.
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Old 15th May 2018
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Re: Stacking in camera, some lenses will, some won't...why is that?

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Originally Posted by Growltiger View Post
Perhaps more importantly:
3. Some lenses change focal length somewhat as they change focus. This particularly applies close up. It prevents good stacking results as the images don't accurately align on top of each other. I think the camera includes the data for the lenses it supports, so it can resize each image based on the lens, and the focus distance. Or perhaps that data has been added to the firmware in those lenses.

See this link for an explanation: https://www.cambridgeincolour.com/forums/thread2411.htm

Users would complain if the stacking was poor, and with some lenses in some situations it would be.

Stacking on a computer may allow more processing, using resizing as well as alignment, to cater for this problem.
Yes, I think this is the reason. It's called focus breathing. I assume that the camera needs lens data to mathematically scale the images to stack them.
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