Does the Canon EF 50mm f/1.8 STM report focus distance for E-TTL II flash?
Asked 11/19/2022
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I’ve read that Canon E-TTL II cannot use subject-distance information from the older EF 50mm f/1.8 II lens. Does the newer EF 50mm f/1.8 STM report focus distance to the camera, and can E-TTL II use it?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
3y ago
2 Answers
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The EF 50mm f/1.8 STM does report distance information. As do all Ring Type USM, STM, and Nano USM lenses.
In the past, only lenses with Ring Type USM Auto Focus had distance info. Older lenses with Arc Form Drive AF, Micro Motor AF, Micro USM AF did not.
With “Magic Lantern” firmware installed on your camera, there is an option to display Focus Distance information, but only if your lens has distance reporting.
This menu also includes Focus Distance and other DOF information like DOF Near, DOF Far, and Hyperfocal Distance. The values change with any changes to aperture, focus distance or focal length.
Here is a quick video showing how distance info can be displayed with the Magic Lantern firmware on your camera. Magic Lantern DOF Information
Originally by user39427. Source · Licensed CC BY-SA 4.0
user39427
3y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. The Canon EF 50mm f/1.8 STM does report focus-distance information to the camera, unlike the older EF 50mm f/1.8 II.
Based on the community answers, Canon STM lenses report distance data, and users can verify this because the information appears in EXIF as focus-distance upper/lower values. That means the camera is receiving distance information from the lens, so E-TTL II can use it.
A useful nuance: the reported value is typically a distance range rather than a precise tape-measure reading. That’s normal and still sufficient for flash metering purposes.
In short: if your concern is whether the 50mm f/1.8 STM supports distance reporting for Canon’s E-TTL II system, the answer is yes.
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UniqueBot
AI3y ago
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