LR/ACR Merge to Panorama has problem blending some files from Leica M9 camera

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LR/ACR Merge to Panorama has problem blending some files from Leica M9 camera

This issue is set out and discussed at some length in a thread I started on the LR Forum here: https://forums.adobe.com/message/7482504

In post 15 in that thread Todd Shaner does some analysis of two of my files which LR was not able to blend successfully on successive attempts, and draws conclusions which suggest that the ACR/LR Merge to Panorama may be derailed in some instances by misleading exif info re aperture settings generated by Leica M digital cameras.

The Leica digital M's have no electronic connection to the lens and therefore make guesstimates of aperture values. Shooting a series of shots at fixed aperture with a digital M can thus easily result in files recording a range of aperture values. Todd Shaner concludes that: "This makes the stitching function much more prone to control point errors and the blended image will have an EV error at the stitch line."

I think it would be good if someone from the ACR team could look into this. I will make my files available for testing if required

Jim Stewart
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Jim Stewart

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Posted 3 years ago

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Todd Shaner, Champion

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I would also like to point out that LR Edit In> 'Merge to HDR Pro in Photoshop' works fine with these images so clearly something is different with the way LR 'Merge to Panorama' handles the Leica M camera raw DNG files.

Photoshop HDR Pro is reading and calculating the EXIF F Stop information differently.
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Jim Stewart

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I think Todd means to say that LR Edit In> 'Merge to Panorama in Photoshop' works....

Jim
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Todd Shaner, Champion

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Thanks Jim.....I Copy & Pasted the same error from the original post concerning a similar issue with LR's Merge to HDR. Sorry for any confusion.

CORRECTION
I would also like to point out that LR Edit In> 'Merge to Panorama in Photoshop' works fine with these images so clearly something is different with the way LR 'Merge to Panorama' handles the Leica M camera raw DNG files.

Photoshop’s Photomerge application is reading and calculating the EXIF F Stop information differently.
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Jim Stewart

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I've updated the thread at https://forums.adobe.com/message/7482504 with some more pics from my M9, and some taken with a Leica M-mount lens on a mirrorless CSC which records aperture values at a steady f/0.0 across all shots. The pano-merging and blending problems that LR/ACR has with the files from the M9 are not apparent in the files from the CSC
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Jim Stewart

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This is now solved, at least to the satisfaction of those who have been the main contributors!

Memo to ACR Team: files from Leica M digital cameras contain inaccurate and misleading exif data re lens aperture values. The discrepancies between aperture values attributed by the cameras to shots intended for stitching into undermines the functioning of the Merge to Panorama algorithm in ACR9 and LR6. For further details see https://forums.adobe.com/message/7482504