How to read focus distance in Exif of OM-1 ii

[Barry Sp]

I just got an OM-1 Mark II camera body and have been pleased with the updates from my EM-1 Mark II. The only missing is that I can no longer use IRFanView to read the focus distance from image Exif information. It works fine with images taken with the EM1ii, but not the OM1ii.

I have updated to the newest version of IRFanView 64, and have installed the extra set of plug-ins to enable reading .ORF files. But no focus distance information from the OM1ii.

Is focus distance contained within the Exif info of OM1ii raw files? If so, how have you been able to read that data from them?

Thanks.

 

[drj3]

Phil Harvey's ExifTools will give you all the EXIF information for all Olympus and OM Systems cameras (as well as most others). I am not sure if there is a current GUI version.

 

[ReedW]

Here's an example from the original OM-1, I'd think the ii would have the same info:

exiftool *7949* | fgrep -i distance
Focus Distance : 18.43 m
Hyperfocal Distance : 17.19 m

I don't recall IrFanView ever showing the focus distance going all the way back to the original EM-1 through the E-M1X, but I could be wrong.

If you use ExifToolGUI, you should be able to add the appropriate tag(s) in the workspace manager, at least in the 5.x version I have. I think there is a 6.x series of releases, don't know if they work the same.

 

[drj3]

Full output for OM1.2

ExifTool Version Number : 12.41
File Name : PB038587.ORF
Directory : G:/Images.Start.07.08.2024/Sussex.Wallkill.11.02.2024
File Size : 20 MiB
File Modification Date/Time : 2024:11:03 16:16:56-05:00
File Access Date/Time : 2024:11:18 21:20:51-05:00
File Creation Date/Time : 2024:11:03 20:43:18-05:00
File Permissions : -rw-rw-rw-
File Type : ORF
File Type Extension : orf
MIME Type : image/x-olympus-orf
Exif Byte Order : Little-endian (Intel, II)
Image Width : 5220
Image Height : 3912
Bits Per Sample : 16
Compression : Uncompressed
Photometric Interpretation : BlackIsZero
Image Description :
Make : OM Digital Solutions
Camera Model Name : OM-1MarkII
Strip Offsets : 1817600
Orientation : Horizontal (normal)
Samples Per Pixel : 1
Rows Per Strip : 3912
Strip Byte Counts : 19447864
X Resolution : 350
Y Resolution : 350
Planar Configuration : Chunky
Resolution Unit : inches
Software : Version 1.2
Modify Date : 2024:11:03 16:16:56
Artist :
Rating : 0
Copyright :
Exposure Time : 1/1600
F Number : 8.0
Exposure Program : Shutter speed priority AE
ISO : 4000
Sensitivity Type : Standard Output Sensitivity
Standard Output Sensitivity : 4000
Exif Version : 0231
Date/Time Original : 2024:11:03 16:16:56
Create Date : 2024:11:03 16:16:56
Offset Time : -05:00
Offset Time Original : -05:00
Offset Time Digitized : -05:00
Exposure Compensation : 0
Max Aperture Value : 8.0
Light Source : Unknown
Flash : Off, Did not fire
Focal Length : 600.0 mm
Thumbnail Image : (Binary data 6838 bytes, use -b option to extract)
Special Mode : Fast, Sequence: 13, Panorama: (none)
Camera ID : OM SYSTEM CAMERA
Equipment Version : 0100
Camera Type 2 : Unknown (S0121)
Serial Number : xxxxx
Internal Serial Number : xxx0
Focal Plane Diagonal : 21.6 mm
Body Firmware Version : 1.200
Lens Type : Olympus M.Zuiko Digital ED 300mm F4.0 IS Pro
Lens Serial Number : xxxx
Lens Firmware Version : 1.600
Max Aperture At Min Focal : 8.0
Max Aperture At Max Focal : 8.0
Min Focal Length : 600
Max Focal Length : 600
Max Aperture : 8.2
Lens Properties : 0x4100
Extender : None
Extender Serial Number :
Extender Model :
Extender Firmware Version : 0
Conversion Lens :
Flash Type : None
Flash Model : None
Flash Firmware Version : 0
Flash Serial Number :
Camera Settings Version : 0100
Preview Image Valid : Yes
Preview Image Start : 52224
Preview Image Length : 1067869
AE Lock : Off
Metering Mode : ESP
Exposure Shift : 0
Macro Mode : Off
Focus Mode : Continuous AF; C-AF, Imager AF
Focus Process : AF Used; 64
AF Search : Ready
AF Areas : (121,118)-(127,127)
AF Point Selected : (48%,56%) (48%,56%)
AF Fine Tune : Off
AF Fine Tune Adj : 0 0 0
Focus Bracket Step Size : 0
Flash Mode : Fill-in
Flash Exposure Comp : 0
Flash Remote Control : Off
Flash Control Mode : Off; 0; 0; 0
Flash Intensity : n/a (x4)
Manual Flash Strength : n/a (x4)
White Balance 2 : Auto
White Balance Temperature : Auto
White Balance Bracket : 0 0
Custom Saturation : 0 (min -5, max 5)
Modified Saturation : Off
Contrast Setting : 0 (min -5, max 5)
Sharpness Setting : 0 (min -5, max 5)
Scene Mode : Standard
Noise Reduction : (none)
Distortion Correction : Off
Shading Compensation : Off
Gradation : Normal; User-Selected
Picture Mode : Natural; 2
Picture Mode Saturation : 0 (min -2, max 2)
Picture Mode Contrast : 0 (min -2, max 2)
Picture Mode Sharpness : 0 (min -2, max 2)
Picture Mode BW Filter : n/a
Picture Mode Tone : n/a
Noise Filter : Low
Art Filter : Off; 0; 0; 0
Picture Mode Effect : Standard
Tone Level : Highlights; 0; -7; 7; Shadows; 0; -7; 7; Midtones; 0; -7; 7; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0
Art Filter Effect : Off; 0; 0; Partial Color 0; No Effect; 0; No Color Filter; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0; 0
Color Creator Effect : Color 0; 0; 29; Strength 0; -4; 3
Monochrome Profile Settings : No Filter; 0; 8; Strength 2; 0; 3
Film Grain Effect : Off
Color Profile Settings : Min -5; Max 5; Yellow 0; Orange 0; Orange-red 0; Red 0; Magenta 0; Violet 0; Blue 0; Blue-cyan 0; Cyan 0; Green-cyan 0; Green 0; Yellow-green 0
Monochrome Vignetting : 0
Monochrome Color : (none)
Drive Mode : Continuous Shooting, Shot 13; Electronic shutter
Panorama Mode : Off
Image Stabilization : On, Mode 4
Stacked Image : No
Manometer Pressure : 0 kPa
Manometer Reading : -999.9 m, -999.9 ft
Extended WB Detect : Off
Roll Angle : -0.2
Pitch Angle : -0.7
Date Time UTC : 2024:11:03 21:16:56
Raw Dev Version : 0100
Raw Dev Exposure Bias Value : 0
Raw Dev White Balance Value : 0
Raw Dev WB Fine Adjustment : 0
Raw Dev Gray Point : 0 0 0
Raw Dev Saturation Emphasis : 0 0 0
Raw Dev Memory Color Emphasis : 0
Raw Dev Contrast Value : 0 0 0
Raw Dev Sharpness Value : 0 0 0
Raw Dev Color Space : sRGB
Raw Dev Engine : High Speed
Raw Dev Noise Reduction : (none)
Raw Dev Edit Status : Original
Raw Dev Settings : (none)
Image Processing Version : 0112
WB RB Levels : 546 500 256 256
WB RB Levels 3000K : 338 880 256 256
WB RB Levels 3300K : 406 690 256 256
WB RB Levels 3600K : 432 632 256 256
WB RB Levels 3900K : 458 588 256 256
WB RB Levels 4000K : 534 714 256 256
WB RB Levels 4300K : 492 558 256 256
WB RB Levels 4500K : 612 564 256 256
WB RB Levels 4800K : 530 516 256 256
WB RB Levels 5300K : 560 480 256 256
WB RB Levels 6000K : 598 430 256 256
WB RB Levels 6600K : 630 472 256 256
WB RB Levels 7500K : 656 380 256 256
WB RB Levels CWB1 : 460 460 256 256
WB RB Levels CWB2 : 460 460 256 256
WB RB Levels CWB3 : 460 460 256 256
WB RB Levels CWB4 : 460 460 256 256
Color Matrix : 374 -92 -26 -40 340 -44 4 -60 312
Black Level 2 : 255 255 255 255
Gain Base : 256
Valid Bits : 12 0
Crop Left : 12 0
Crop Top : 12 0
Crop Width : 5184
Crop Height : 3888
Sensor Calibration : 4095 281
Noise Reduction 2 : (none)
Distortion Correction 2 : Off
Shading Compensation 2 : Off
Multiple Exposure Mode : Off; 1
Aspect Ratio : 4:3
Aspect Frame : 0 0 5183 3887
Faces Detected : 0 0 0
Face Detect Area : (Binary data 191 bytes, use -b option to extract)
Max Faces : 8 8 0
Face Detect Frame Size : 0 0 0 0 0 0
Face Detect Frame Crop : 0 0 0 0 0 0 0 0 0 0 0 0
Camera Temperature : 31
Keystone Compensation : Off
Focus Info Version : 0100
Scene Detect : 0
Zoom Step Count : 0
Focus Step Count : 2142
Focus Step Infinity : 2000
Focus Step Near : 12768
Focus Distance : 82.525 m
AF Point : Unknown (8608)
External Flash : Off
External Flash Bounce : Bounce or Off
External Flash Zoom : 0
Internal Flash : Off
Manual Flash : Off
Macro LED : Off
Sensor Temperature : 38 38 0 C
User Comment :
Ambient Temperature : -0 C
Pressure : 0
Water Depth : -0
Acceleration : 0
Flashpix Version : 0100
Color Space : sRGB
File Source : Digital Camera
CFA Pattern : [Red,Green][Green,Blue]
Custom Rendered : Normal
Exposure Mode : Auto
White Balance : Auto
Digital Zoom Ratio : 1
Scene Capture Type : Standard
Gain Control : High gain up
Contrast : Normal
Saturation : Normal
Sharpness : Normal
Lens Info : 600mm f/8
Lens Model : M.300mm F4.0 + MC-20
GPS Version ID : 2.3.0.0
Aperture : 8.0
Blue Balance : 1.953125
Image Size : 5220x3912
Megapixels : 20.4
Preview Image : (Binary data 1067869 bytes, use -b option to extract)
Red Balance : 2.132813
Scale Factor To 35 mm Equivalent: 2.0
Shutter Speed : 1/1600
Create Date : 2024:11:03 16:16:56-05:00
Date/Time Original : 2024:11:03 16:16:56-05:00
Modify Date : 2024:11:03 16:16:56-05:00
Extender Status : Not attached
Circle Of Confusion : 0.015 mm
Depth Of Field : 4.51 m (80.33 - 84.84 m)
Field Of View : 1.7 deg (2.45 m)
Focal Length : 600.0 mm (35 mm equivalent: 1201.9 mm)
Hyperfocal Distance : 3000.00 m
Lens ID : Olympus M.Zuiko Digital ED 300mm F4.0 IS Pro + 2x
Light Value : 11.3

 

[meow]

I *think* digiKam does it. I haven't kept the program updated and my old version doesn't support OM-1. It does have that entry for E-M1 though. It's at Metadata | Makernote | Focus Distance.

 

[Barry Sp]

Thanks all. I downloaded Exiftool and it worked as-described. Barry

 

[Toni Genes]

Is the focus distance a reliable info ?

Probably not.

In the past, when I checked it, I had the feeling is not a reliable information.

 

[Barry Sp]

Is the focus distance a reliable info ?

Probably not.

In the past, when I checked it, I had the feeling is not a reliable information.

I'd guess that it depends on both the camera type and the distance being measured. At a long distance very little movement of the focusing mechanism corresponds to a large change in focusing distance (see the distance markings on a mechanical focusing lens). So I wouldn't expect to see great accuracy there.

I checked some examples from my archive, and confirmed that my EM1ii identifies shots taken with a focusing distance of about 1000 meters as infinity. Same for 2700 meters.

On the other hand, I took a number of shots today with the EM1ii and the Oly 75-300 lens of a 3 feeder, bird feeding station behind my deck. A dozen of those shots selected at random all showed distances between 14.5 and 14.8 meters. IMO, a plausible and precise range considering the size of the feeding station. After seeing your note, I went out and measured that distance as accurately as I could considering I had to go over some bushes and up several steps, and got 14.3 meters. Pretty good agreement considering the potential errors in my measurement.

Also, I checked a number of other shots at intermediate distances between about 25 and 300 meters, and all seemed to give plausible results. I can't say that they were accurate within a particular error range, but they made sense.

Good enough for me.

 

[Bobapingu]

Is the focus distance a reliable info ?

Probably not.

In the past, when I checked it, I had the feeling is not a reliable information.

I'd guess that it depends on both the camera type and the distance being measured. At a long distance very little movement of the focusing mechanism corresponds to a large change in focusing distance (see the distance markings on a mechanical focusing lens). So I wouldn't expect to see great accuracy there.

I checked some examples from my archive, and confirmed that my EM1ii identifies shots taken with a focusing distance of about 1000 meters as infinity. Same for 2700 meters.

On the other hand, I took a number of shots today with the EM1ii and the Oly 75-300 lens of a 3 feeder, bird feeding station behind my deck. A dozen of those shots selected at random all showed distances between 14.5 and 14.8 meters. IMO, a plausible and precise range considering the size of the feeding station. After seeing your note, I went out and measured that distance as accurately as I could considering I had to go over some bushes and up several steps, and got 14.3 meters. Pretty good agreement considering the potential errors in my measurement.

Also, I checked a number of other shots at intermediate distances between about 25 and 300 meters, and all seemed to give plausible results. I can't say that they were accurate within a particular error range, but they made sense.

Good enough for me.

You have been more thorough than I, but in my experience, the accuracy is little better than looking with a trained eye. That's all it needs to be for photography considering the vagaries of DOF. It's quite ludicrous for the system to quote measures to three significant figures. Having said that, accurate range finding by some other means, would be nice but by no means essential.