I have noticed that on the viewer in Aperture the metadata displayed includes Max. Lens Aperture. This field seems to always display a smaller aperture than the actual maximum.
For example, my 30mm lens and 19mm lens on my Sony NEX 7 both have maximum apertures of f/2.8 but the viewer displays it as 2.97. Also my Canon 650D 18-135mm lens has a maximum aperture at the wide end of f/3.5 but the viewer displays it as 3.56.
Can anyone, please, enlighten me as to why this should be?
Thanks,
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Strange metadata
#1
Clive,
What I was pointing out was in response to you saying “This is then only place the Lens Max Aperture is displayed as far as I know”. You can customize any metadata view to include any metadata you like.
@PhotoJoseph
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Clive,
Could be that the lens/camera is embedding the wrong metadata in the file, or Aperture is reading the metadata incorrectly.
Can you open the image (the original) in another app like Photoshop to see what it says there? If it’s the same reading, then you know it’s the camera that’s at fault. If it’s accurate, then we know that Aperture is at fault.
@PhotoJoseph
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Joseph,
Thanks for your reply. A good point. However, this field must be peculiar to Aperture. It does not exist in Photoshop Elements. The strange thing is that both Aperture and PS Elements report the name of the lens correctly, including the maximum aperture. It is only in this field (which appears in the info under the picture in view mode) that a separate field is given for Lens Maximum Aperture, and I think this field must be calculated somehow. It always seems to be slightly different from the actual maximum aperture.
Clive,
Curious… I looked at a few photos in my Library and none of them have a Maximum Aperture reported!
@PhotoJoseph
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Joseph,
When in viewer mode there is an icon at bottom right (second from left) called browser and metadata overlays. If you press that button you obtain a small menu and one choice allows you to select show metadata. If you select this choice you get some metadata underneath the picture in viewer mode. This is then only place the Lens Max Aperture is displayed as far as I know.
You can customize any metadata view you want. Try Command-J.
@PhotoJoseph
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Oh and this… http://screencast.com/t/py38HCOD
@PhotoJoseph
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Thanks. I did not know about Command-J. However, I only wanted to know why that field reports what seems to be erroneous data.