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Focus Shift Compensation
This article is part of a series. See Introduction to Camera Features to start.
Focus shift robs sharpness from images when focusing is done at a different aperture from the shooting aperture.
Requirements:
- Ideal way (presumes tripod) that works for any lens: camera analyzes chosen pinpoint spot for peak micro contrast at the shooting aperture, focuses for that.
- Supports use of autofocus or manual focus in magnified Live View to specify starting point.
- Supports use of autofocus or manual focus in magnified Live View to specify ending point.
- Must support focusing to frame edge for starting/ending points.
- AF required for shooting the sequence
- Optional support for manual focus sequences (for manual focus lenses) with auditory and visual feedback of next focus position.
- Control over step size.
- Accounts for field curvature to determine INF. Best done by image analysis while taking (NOT pre-called lens profiles, which can be wrong for individual lens samples).
- ADon’t do stupid stuff like 50 badly blurred frames past INF (Nikon does that).
- Option to preconfigure near-to-far setups eg 1m to INF, 3.5m to INF, etc.
- Auto detect near/far blur boundaries and narrow step size locally for superior stitching results.
Sony | Nikon | Fujifilm | Canon | Panasonic | Leica |
---|---|---|---|---|---|
NONE | does not understand INF (keeps taking images way past INF), does not offer far point, too slow which causes stacking issues as scene changes | serious bugs with tele lenses, no ability to focus in outer zones even in Live View | NONE | NONE (no useful mode) | NONE |
no camera yet offers anything close to ideal features |