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Lens tagging
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Ok this is a cross-post from flickr central:
Hello all,
as you may have seen, Flickr are rolling a new feature this week that they call "machine tag". Basically, these are tags of the form:
domain:predicate=value
like there was the geotag: geo:lat=XXX for example or the flickr:user=mortimer?
This new feature will apparently allow to make more specific searches on tags, etc... like searching for all photo tagged with a user:
flickr:user=*
I was thinking this could be the time to introduce a tagging scheme for SLRs photos so that we can search photo per lens. I was thinking of something like a set of tags in the domain "lens" that will give information on the lens like the maker, the focal length, the aperture, the model.
For example:
lens:maker=sigma
lens:focal_min=70
lens:focal_max=300
lens:aperture=4-5.6
lens:macro="1:2"
lens:model="APO DG Macro"
or:
lens:maker=canon
lens:focal_min=50
lens:focla_max=50
lens:aperture=1.8
lens:prime=true
lens:model="MkII"
This could allow to search for all prime lens: lens:prime=true or all macro lens from sigma: lens:macro=* lens:maker=sigma
etc... etc...
What do you think about it?
Posted at 2:19AM, 25 January 2007 PDT
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I think most of it is already included in EXIF data, isn't it?
Posted 18 months ago.
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The EXIF data doesn't return much about the lens. Certainly not the brand or model. I don't think it can tell you the focal length range, either. Also, EXIF data cannot currently be searched through the website or the API.
Posted 18 months ago.
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None of these are in the EXIF data Nicolas. You can get data on the configuration of the camera for one shot, but not the lens used.
These tags would be usefull to give the specifications of the lens, not it's actual setting for the shot in question. So people can search for image taken with the same lens are theres, or a lens they are about to buy, etc...
I think we would need these two other tags:
lens:category=prime instead of lens:prime=true
and
lens:mark=II instead of lens:mode="MkII", the model would only contain maker specific notations, like DG, EF, etc...
On Flickr Central, some also expressed the need for the lens:mount=canon tag. This way, someone could search for photo of sigma lens with a canon mount. (as long as the camera search feature of flickr is not really usable everywhere).
Posted 18 months ago.
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OK, I have been looking at the EXIF details of my photos, and I must agree with both of you! ;)
Posted 18 months ago.
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mortimer?: now that we have a machine tags wiki, I suggest you join the wiki and get started on creating that namespace. Make sure to post to the mailing list when you have a draft for it; directions are on the front page of the wiki.
-Chasen
Posted 17 months ago.
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lens data is certainly in the EXIF data, except its not standard. its put in the manufacturer's data section and is different for each make/model.
For examples done in PHP, www.offsky.com/software/exif/index.php
For example of Perl tool, www.sno.phy.queensu.ca/~phil/exiftool/
But lens data (and other manfacturer specific data) is definitely put into EXIF, especially DSLRs. It just has to extracted on a make/model basis.
Posted 10 months ago.
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