April 10, 2015

Richard

Adding Metadata in Lightroom

This is a fun little lens. The only downside to the 9mm body cap lens is that photos taken with it will not have any lens metadata in them, as there’s no electronics in the lens and therefore the camera doesn’t know what lens is attached. Fortunately, it’s possible to add lens information, which can be useful when sorting or searching photos. There are a few ways to do this. I tried using exiftool and the LensTagger plugin, but couldn’t get either to work.

What worked was to create a XMP file for each photo, save it in the same location as the photos, and then import them into Lightroom. The lens information is saved in Lightroom’s database, and in a sidecar XMP file if you have that option enabled in Lightroom or use the “Save Metadata to File” command. The advantage of this approach is that the metadata is not written into the original RAW file, avoiding the potential of corrupting the file.

The XMP file that I created contains the following:

<?xml version="1.0" encoding="UTF-8"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about="" xmlns:exif="http://ns.adobe.com/exif/1.0/">
<exif:FocalLength>9</exif:FocalLength>
<exif:FocalLengthIn35mmFilm>18</exif:FocalLengthIn35mmFilm>
<exif:FNumber>8</exif:FNumber>
<exif:ApertureValue>6</exif:ApertureValue>
</rdf:Description>
<rdf:Description rdf:about="" xmlns:aux="http://ns.adobe.com/exif/1.0/aux/">
<aux:Lens>OLYMPUS 9mm F8.0</aux:Lens>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>

Note that the ApertureValue of 6 converts to an F-stop of 8.0. There is a similar MaxApertureValue field, but I could not get Lightroom to read the information correctly, so I didn’t include it in the XMP file (Lightroom will record the maximum aperture value as 0/256 in the XMP file and display it as an F-stop of 1.0). As for the name of the lens, I used the same format that Olympus uses for their other Micro 4/3 lenses, but I left out the “M.” as it’s not an M.Zuiko lens.

The XMP file must be saved as a plain text file with the same name as the photo, and the extension XMP. Creating multiple versions of the same file is relatively easy in Mac OS X (I have no idea about Windows). I press Command-D to duplicate the file, and keep pressing it until I have as many XMP files as I need, then I bulk rename them to match the RAW file names (which are usually in sequence).

April 04, 2015

Bruce

A cute little lens

Easily opened in error in your bag and completely manual but, for little money, size and weight, it's a fun lens to have.

June 24, 2014

Ryan

Cute cap lens

The fisheye cap lens is a cute little addition. It's not a real micro 4/3 lens in the sense that it does not connect to the camera's electronics. It's simply a cap with a non-trivial but manually-operated lens. The switch to open and close the lens is a little primitive, and can be easily bumped open if you have you're storing your camera loosely in a bag. But I find the lens quite useful in many fun situations where one may not want or need a very sophisticated lens, like say, chasing my boy around at the beach.