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Someone referred me once to Exposure Plot. This is a free Windows utility which is very simple. It shows you graphs of different parameters, one of them being focal-length. If you already use image management application like Lightroom or Bibble Pro, then you can also usually see that data in the filter interface. For Lightroom for example, you need to ...
I believe ExifTool can be used to produce this kind of analysis, but it requires some technical command-line knowledge. For example, see this: http://www.flickr.com/photos/code_martial/3280664879/
I know of Exposure Plot ExposurePlot on PC, it's pretty nice and free. Is your question that you are looking for one on Mac? Someone asked in DPReview forum but not much came out of it. Someone elsewhere is using Parallels Desktop to run a Windows XP virtual machine and use Exposure Plot from it.
For Lightroom users, Jeffrey Friedl's Data Plot plugin is great... http://regex.info/blog/lightroom-goodies/data-plot What's nice about that is being able to filter your photos in Lightroom, keepers, 5 star rated, certain lenses, whatever, then seeing the focal lengths for just those photos.
The high reject rate for reviews tends to be down to them wanting a lens that is perfect for the test body they use. The tolerances for lenses and bodies can either add up to something unacceptable or cancel each other out. For instance if a lens is at one end of a tolerance limit and the camera body is also slightly out in the same direction this ends up ...
I've used Aperture's Smart Albums to get this information out, but you'll only get one data point at a time, so it can be a slow process if you want detailed stats. You can make Smart Albums that search for photos by any of the EXIF/IPTC data (camera body, lens, focal length, aperture, shutter speed, iso, ...) and see how many photos match the search.
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