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Wikidata:Property proposal/aperture

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apertureEdit

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DescriptionIn optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. See also en:aperture for more details for background. As aperture is an important indicator for a lens. As there are lot of data bout lenses, it would be useful to add the value.
Representsaperture (Q6434802)
Data typeProperty
Template parameteren:template:Infobox photographic lens aperture
Allowed valuesA range with min and max value or a fixed value as both is possible.
Allowed unitsAperture is a numeric value without units.
Example 1Canon EF 800mm lens Q5033222; en:Canon EF 800mm lens
Example 2Samyang 500mm f/8 Q25038830; en:Samyang 500mm f/8
Example 3Canon EF 1200mm lens Q5033201; en:Canon EF 1200mm lens
Example 4Canon EF 70–200mm lens Q1358428; en:Canon EF 70–200mm lens
Sourceen:Aperture
Planned useI like to add the aperture to the lenses, which has wiki data item.
Number of IDs in sourceFor Canon we have currently lens items, where it would make sense to add this aperture.

MotivationEdit

I like to add this value to the photo lenses, which have an item in Wikidata. GodeNehler (talk) 17:06, 6 June 2019 (UTC)

DiscussionEdit

  •   Support --Tinker Bell 20:42, 8 June 2019 (UTC)
  •   Support NMaia (talk) 10:18, 10 June 2019 (UTC)
  •   Comment Make sure to distinguish this from Property:P6790 (f-number) or list it as a related property. Infomuse (talk) 03:32, 14 June 2019 (UTC)
  •   Comment @Infomuse Thank you for the hint. As I am not a nativ speaker for english, and checking this issue again, I got the impression that 'f-number' might be the better Property, as 'aperture' seams to be the mechanic, but 'f-number' is the value, which I like to add. But in the Lens articles, like mentioned above, and in the template is the term 'aperture'. So I am not sure what is correct. The second issue: I have just add the 'f-number' to the Samyang 500mm f/8. There I got the warning 'Entities using the f-number property should be instances of photograph (or of a subclass of it), but Samyang 500mm f/8currently isn't.' From that I got the Impression that the 'f-number' is the real value, with which a picture is taken. So not absolutely clear for me. --GodeNehler (talk) 07:51, 15 June 2019 (UTC)
  •   Comment After thinking about the issue, I got to the conclusion, that aperture is the correct term as aperture means the mechanical construct, which is correct for a lens. --GodeNehler (talk) 19:21, 20 June 2019 (UTC)
  •   Comment A range is not sufficient because there are 2 different kinds of aperture ranges. First, some zoom lenses have different maximum apertures depending on the selected focal length (for example, w:en:Sony FE 28-70mm F3.5-5.6 OSS). Second, at a given focal length, a lens has a minimum and maximum possible aperture that the photographer can select. So we really need 4 numbers to characterize lens aperture ranges as commonly specified (min/max aperture when zoomed wide/tele). 2620:0:1000:3216:5413:4AF0:7532:8655 22:30, 21 June 2019 (UTC)
  •   Comment The IP is right. This can be fixed with the possibility to add up to 4 values. Maybe there is a need to add infos like 'minimum aperture', 'maximum aperture' for prime lens, 'minimum aperture at maximum focal length', 'maximum aperture at maximum focal length', 'minimum aperture at minimum focal length', 'maximum aperture at minimum focal length' for zoom lenses and 'fixed aperture' e.g. for mirror lenses. --GodeNehler (talk) 16:38, 28 June 2019 (UTC)