Match Total Exposures

Report · Aug 18, 2023

I just installed 12.5 on my MBP Pro 16" riunning MacOS 13.5 and have run to two major issues:

1. Match Total Exposures is broken. Second photo (the one that should have it's expose adjusted to match the first photo) gets its exposure set to 5.00. I've tried this for multuple different pairs.
2. I am getting frequent beach balls while moving throught the film strip (every 5 photos ort so). I'm on a powerful machine (M1 Max with 64 GB Ram), so no excuse for this hapenning (was not happening in L$ 12.4).

Report · Aug 18, 2023

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I just did a quick test in my LR 12.5 / Mac OS with six randomly selected photos, and Match Total Exposure worked correctly. It set Exposure of the last five photos so that their Effective Exposure Value (EEV) matched that of the first photo:

"Second photo (the one that should have it's expose adjusted to match the first photo) gets its exposure set to 5.00."

That indicates the Exposure Value (EV) of the second photo was more than 5 stops less than that of the first photo. But the Exposure slider only goes to +5.

Three ways to verify the results of the Match Total Exposure command:

1. You can double-check the EVs and their difference yourself. The formula is:

EV = log2 (aperture ^ 2 / shutterspeed) - log2 (ISO / 100)

For example, for an exposure of f / 5.6, 1/600 sec, ISO 160, the EV is:

log2 (5.6^2 / (1/600)) - log2 (160 / 100) = 13.52 (rounded to two places)

The difference of the two EVs is what the Exposure slider of the second photo should be set at.

2. Or use the EV calculator:

https://rechneronline.de/exposure/

(Use a normal calculator to convert fractional shutterspeed to decimal, e.g. 1/100 sec = 0.01.)

3. Or post here the exposures of the two photos, and I'll calculate the EVs.

4. Or, you can use the free trial of the Any Filter plugin to display EV and EEV, as shown above.