Is there a way for either CNX2 or ViewNX2 to display the actual focus distance used in an image? I'm able to turn on the "focus point" feature with images shot with my D90, 16-85VR lens, but I was hoping to see what distance the camera actually set for the focus point shown (this, because I suspect it's not focusing accurately, especially at the wide end).
gkaiseril Chicago, US Nikonian since 28th Oct 2005
Sun 24-Apr-11 07:42 PM
#1. "RE: FINDING FOCUS DISTANCE " In response to Reply # 0
That information in contained within the MakerNote section of the Exif data. You will need an external program that is capable of reading that data. And some of the you will see would look like:
ExifTool Version Number : 8.41 File Name : dsc_2171.jpg File Type : JPEG Make : NIKON CORPORATION Camera Model Name : NIKON D70 Software : Ver.2.00 Exposure Time : 1/60 F Number : 5.0 Exif Version : 0221 Max Aperture Value : 4.8 Metering Mode : Multi-segment Focal Length : 56.0 mm
Maker Note Version : 2.10 ISO : 200 Focus Mode : AF-S Lens Type : G VR Lens : 18-200mm f/3.5-5.6 AF Area Mode : Dynamic Area (closest subject) AF Point : Top AF Points In Focus : Top AF Aperture : 4.8 Focus Position : 0x99 Focus Distance : 5.96 m Lens ID Number : 139 Digital Zoom Ratio : 1 Focal Length In 35mm Format : 84 mm Subject Distance Range : Unknown Aperture : 5.0 Lens ID : AF-S DX VR Zoom-Nikkor 18-200mm f/3.5-5.6G IF-ED Lens : 18-200mm f/3.5-5.6 G VR Scale Factor To 35 mm Equivalent: 1.5 Shutter Speed : 1/60 Circle Of Confusion : 0.020 mm Depth Of Field : 2.33 m (5.01 - 7.34) Field Of View : 24.0 deg (2.53 m) Focal Length : 56.0 mm (35 mm equivalent: 84.0 mm) Hyperfocal Distance : 31.31 m Light Value : 9.6
Also you need to be aware the the focus points in the camera's veiwfinder and software are not exactly in palsy where the senseors are within the camera. You probably need to set up an image with markers at exact locations, and test at where within the focal point slected area the sensor really is located. You could also try different focus modes and observe what sensor is used.
Focus distance will only be reported with a chipped lens that reports that data, usualy a D or G lens.
#3. "RE: FINDING FOCUS DISTANCE " In response to Reply # 2
>Thanks for the quick reply...this really helps point me in >the right direction. Could you recommend an external program >that would display this info? Thanks again!
I really like PhotoMe. I hit the search button and enter "dist" in the search field and that usually narrows down the displayed data to isolate Focus Distance. PhotoMe is free from http://www.photome.de/