Property talk:P9597

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type of lens
type of lens used in a lighthouse, telescope, camera, etc.

Represents	lens (Q768575)
Data type	Item
Domain	lighthouse (Q39715), optical instrument (Q1751850) or lamp (Q1138737)
Allowed values
Example	Bell Rock Lighthouse (Q2305375) → hyperradiant Fresnel lens (Q5958548) Monte Poro Lighthouse (Q16555269) → fifth order Fresnel lens (Q24628998) Abrolhos Lighthouse (Q10280145) → meso-radial Fresnel lens (Q24629368)
See also	sensors (P9192)
Lists	list of Fresnel lighthouse lens sizes (Q24631247) Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties By value of property Most statements Fewest statements Most sitelinks Most linked wikis Total of sitelinks on items Most identifiers Fewest identifiers Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Complex constraint violations/P9597 Database reports/Constraint violations/P9597 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 1,756 Main statement 1,753 99.8% of uses Qualifier 3 0.2% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

Value type “Fresnel lens (Q14672), lens (Q768575), reflector (Q1823435)”: This property should use items as value that contain property “instance of (P31), subclass of (P279)”. On these, the value for instance of (P31), subclass of (P279) should be an item that uses subclass of (P279) with value Fresnel lens (Q14672), lens (Q768575), reflector (Q1823435) (or a subclass thereof). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9597#Value type Q14672, Q768575, Q1823435, SPARQL

Type “lighthouse (Q39715), optical instrument (Q1751850), lamp (Q1138737)”: item must contain property “instance of (P31), subclass of (P279)” with classes “lighthouse (Q39715), optical instrument (Q1751850), lamp (Q1138737)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9597#Type Q39715, Q1751850, Q1138737, SPARQL

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9597#Scope, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9597#Entity types

This property is being used by: br:Patrom:Infobox tour-tan/gouloù th:แม่แบบ:กล่องข้อมูล ประภาคาร/ไฟ Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)

candidates (from categories, mainly Commons)
add statement if applicable (Help)
Violations query: SELECT DISTINCT ?item ?lense ?endpoint WHERE { hint:Query hint:optimizer "None". ?lense wdt:P279 wd:Q14672 . ?catitem wdt:P971 ?lense . ?sitelink schema:about ?catitem ; schema:isPartOf ?site ; schema:name ?title. BIND (REPLACE(STR(?site), ".+/(.+)/", "$1") AS ?endpoint) BIND (STR(?title) AS ?cat) SERVICE wikibase:mwapi { bd:serviceParam wikibase:endpoint ?endpoint; wikibase:api "Generator"; mwapi:generator "categorymembers"; mwapi:gcmtitle ?cat ; mwapi:gcmprop "title"; mwapi:gcmlimit "max"; mwapi:gcmnamespace "14". ?item wikibase:apiOutputItem mwapi:item. } FILTER( BOUND(?item) ) ?item wdt:P31/wdt:P279? wd:Q39715 . FILTER NOT EXISTS { ?item p:P9597 [] } } LIMIT 100
List of this constraint violations: Database reports/Complex constraint violations/P9597#candidates (from categories, mainly Commons)

Lens types

Considering that this property is intended for light sources in general and lighthouses in particular, I think we should loosen up the constraints a bit. Today I added parabolic reflector (Q1087850) and sidereal reflector (Q108563988) to the list of allowed values because not only refractive lenses are used in lighthouses, but also reflective lenses. Even though it is a bit old fashioned today mirror lenses have been frequently used historically. I also think there should be more objects for drum lenses and planar lenses and not just the size on the Fresnel scale. /ℇsquilo 18:55, 16 September 2021 (UTC)

Yes please. It would be great to get more choice of values for this property — Martin (MSGJ · talk) 10:26, 29 October 2022 (UTC)

Add telescopes and cameras?

The description of this property is: type of lens, type of lens used in a lighthouse, telescope, camera, etc.

But the statements are all about lighthouses and fresnel lenses, without mention of telescopes or cameras.

Should we remove these optical devices them from the description? Or should changes be made to the statements to include them? Senator2029 08:16, 29 October 2022 (UTC)

Susannaanas
Jura
Lymantria
pmt
Esquilo
Vanbasten_23
Akuckartz
Bluerasberry
MSGJ
PtiBzh

Notified participants of WikiProject Lighthouses Senator2029 08:29, 29 October 2022 (UTC)

I don't see any reason to narrow the scope of the property. If there are no statements currently, then there may be some added in the future — Martin (MSGJ · talk) 10:25, 29 October 2022 (UTC)

The property is used at c:File:S66-37970 - Gemini IX-A Augmented Target Docking Adapter (Raw scan).tif although causing a constraint violation. Shouldn't we add objective (Q3880557) to the value-type constraint (Q21510865) in stead of limiting? Lymantria (talk) 10:46, 29 October 2022 (UTC)

I agree that the scope could/should be widened, but just adding objective (Q3880557) to property constraint (P2302) is a bad idea. The allowed values should be as specific as possible. So we should add double-Gauss lens (Q1292200), Aplanat (Q571242), Vario-Sonnar (Q7915926), etc, but not objective (Q3880557). /ℇsquilo 14:03, 29 October 2022 (UTC)

An when it comes to the docking scenen mentioned, the correct property to use is captured with (P4082). /ℇsquilo 14:05, 29 October 2022 (UTC)

Seeking additional comment, especially as to how best to implement any change. Senator2029 13:55, 28 December 2022 (UTC)