Talk PTP directly to skip gphoto2's verify-each-step loop: Sony ISO changes in 4-5s not 20s
ssh4net · x · 2026-09-16
ssh4net shares a hands-on optimization for remote ISO control on Sony cameras. The naive path is slow: Sony's remote protocol only changes ISO in increment/decrement steps, and libgphoto2 verifies each step (change then read back), so a large ISO jump takes 16-20 seconds.
His fix:
- Native Sony imaging apps use the same SDK and PTP protocol and can change ISO almost instantly across any range
- Drive PTP directly: read current ISO, compute the number of steps needed, send increments/decrements with small delays without per-step verification, then read the final ISO once, optionally correcting with a single change
- Result: 4-5 seconds instead of 16-20
He also mocks Sony's wrap-around ISO range design as "funny".
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