Focus distance information in image

peter460 — Tue, 17 Oct 2017 13:48:50 GMT

DPP seems to be able to determine focus distance infomation. Is it possible to read this infomation of a raw file with another software tool?

Re: Focus distance information in image

kvbarkley — Tue, 17 Oct 2017 15:11:59 GMT

Not all lenses have it, but you could try EXIF tool.

Re: Focus distance information in image

peter460 — Tue, 17 Oct 2017 17:48:24 GMT

Thanks , Yes using the tool I see the lens I tried it on Canon EF 70-200 F4 L had the following infomation

Focal Distance Upper ( m )

Focal Distance Lower ( m )

Hyperfocal distance (m )

depth of field ( m )

depth of field lower limit (m )

depth of field upper limit (m)

Circle of confusion ( mm ) - uses this value to determine hyperfical distance

I checked the values agains a test shot agains subject at a know distance and it seem quite accurate. What I cannot figure out is what Focal Distance Upper and Lower are - here are the test results

Focal length 184mm

circle of confusion 0.02mm

Subject distance to image plane 4.47 m

Focal distance Upper 5.37m

Focal Distance Lower 3.88 m

depth of field 0.10 m

depth of field lower limits 4.58 m

depth of field upper limit 4.67 m

The GUI version of the exiftool does not have all these parameters decoded in the jpg files I tested it on ex canon 6D Mk2

topic Re: Focus distance information in image in Camera Software

Focus distance information in image

Re: Focus distance information in image

Re: Focus distance information in image