Digital zoom and Leica Perspective Correction (LPC).

[SrMi]

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The issue described occurs only in Adobe software, which is the only software that recognizes digital zoom and LPC metadata instructions.

Q3 can show only the guidelines for LPC or the framing lines for digital zoom. However, you can engage both, and the final image reflects this (the image is cropped, and LPC is applied).

One issue is when LPC is off. The angles are always written in the DNG, which allows for applying LPC in the post, even if LPC is turned off in the camera.

However, if you press the "Guided" button in the Transform panel (LrC), you'll get weird results (overcropping). When LPC was off in the camera and the digital zoom was enabled, you must remove the digital zoom crop to apply LPC in the post.

 

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[Qwertynm]

I also found once LPC is enabled in camera I was unable to alter the digital crop (in camera) without first having to disable LPC. Weird behavior 

[Le Chef]

Since you can do perspective corrections in post, I don’t see why you would waste your time by doing it twice, once in camera and once in post.

[SrMi]

25 minutes ago, Le Chef said:

Since you can do perspective corrections in post, I don’t see why you would waste your time by doing it twice, once in camera and once in post.

It is not possible to do it twice.

The angle metadata is always stored in the DNG. If you turn on LPC in the camera, Adobe software can apply it automatically when imported. If you turn off LPC in the camera, you can apply it manually in the Adobe software.

[Kozonoh]

But if you don’t use adobe you don’t need to worry. Personally I prefer Dxo pl 7.

[Le Chef]

I tried it once in camera and switched it off straight away. It messed with how I saw the image and for me it’s much easier to do it in Lightroom where you have much better control in 3D than in camera.

[SrMi]

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31 minutes ago, Kozonoh said:

But if you don’t use adobe you don’t need to worry. Personally I prefer Dxo pl 7.

I'd rather "worry" and have LPC and digital zoom crops for raw files. This is why DxO PL is not an option when using Leica DNGs (I do have licenses for DxO software).

[SrMi]

27 minutes ago, Le Chef said:

I tried it once in camera and switched it off straight away. It messed with how I saw the image and for me it’s much easier to do it in Lightroom where you have much better control in 3D than in camera.

LPC is one of the relevant reasons why I would choose Leica instead of Nikon or Sony when traveling.

LPC is also done in Lightroom, but without guessing. when doing it manually. LPC is also tunable in post and can be turned off completely.

[David Wien]

2 hours ago, SrMi said:

I'd rather "worry" and have LPC and digital zoom crops for raw files. This is why DxO PL is not an option when using Leica DNGs (I do have licenses for DxO software).

I use DXO Photolab 6 to process all the photos I take with my Q3 and Canon R6, and am extremely happy with its abilities.

David

[Kozonoh]

The difference between lpc and pc applied in post processing is that in post processing you see what is going on and you can fine tune it as all the other parameters of a raw file.

[Guest]

1 hour ago, Kozonoh said:

The difference between lpc and pc applied in post processing is that in post processing you see what is going on and you can fine tune it as all the other parameters of a raw file.

And it's the same with the Q3, you can choose to do PC in post processing whether or not you have previously selected LPC in the camera. the LPC is not baked into the RAWs, all that happens is that the LPC metadata is included in the RAW file and you can choose whether or not LR applies it automatically. (obviously it is baked into jpgs, but that's a different discussion)

Another advantage of LPC that you don't get with post processing is that you can be sure that you've captured the whole corrected image before you take the photo. With converging verticals etc, you don't want to get home and discover that you've lost the top of the Cathedral spire when you try to do PC in post.

[Kozonoh]

You are right. But I was raised with analog film so for me it is part of the process to be able to visualise / imagine the final result. And if you miss it, so be it. As the saying goes, the best images are these you have missed.