M10-R with 50APO Lightroom Classic 6.14 merge pano-dng

[dugby]

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In preparation for a single lens M10-R, tour of the middle-east I've chosen to take only the 50APO and not the 35FLE.

So for wide angle shots, I've been experimenting with the image stitch (merge) function of Adobe Lightroom Classic 6.14 and have been pleased with the merged pano-dng files.

 

However in LR I've noticed a slight image exposure difference, more noticeable at the merge line of the two adjacent images, so when I merge the two DNGs that difference is baked into the new pano-dng file.

The 50APO was set to 5.6 for all shots, however M10-R was set to auto-ISO and auto-shutter speed.  I am now thinking I probably also need to either fix the ISO or shutter speeds for these pano shots, but this may still result in different exposures.

 

Are there any other considerations to match up the exposures for the stitch candidates ? Or have I encountered a limitation of stitching images ?

 

Thankyou for any tips or advice

Edited March 17, 2023 by dugby

[wda]

Using auto-ISO is the cause of your problems. You must have no variables in exposure determination. If the light changes during your panoramic capture, repeat the process in stable lighting. 

Edited March 17, 2023 by wda

[dugby]

Thankyou for your response.

 

The two shots were taken 5-10 seconds apart, in broad daylight.

Image A is  f#5.6 and ISO100 and 1/1000th

Image B is  f#5.6 and ISO100 and 1/350th

 

The issue is that Center-Weighted Metering is detecting the exposure difference.

[convexferret]

You'll want to select an exposure that works for the whole panorama, which usually means getting it right for the brightest part of the final image and bringing up shadows elsewhere afterwards if necessary. That requires that you plan the pano before you start but will ensure the best final image quality.

[dugby]

Thankyou for your responses, which confirmed my initial thoughts that I"ll have to manually set all three :  f#, ISO and shutter speeds to the same settings for each shot.                                                                                                                                                                                                                                                                                                   The unexpected action by LR6.14 was that when the two DNGs were merged to create the new pano-DNG, the software seems to have adjusted the bright image down a little and also adjusted the darker image to be slightly brighter than each of the original DNGs - totally unexpected, which had me wondering if I had missed some settings in LR6.14

All I did to create the pano-DNG was select the first DNG with left mouse button, using Ctrl and select second DNG and then  hit "Ctrl M"  which creates the merge into the new pano-DNG

 

Edited March 17, 2023 by dugby