Dating a camera or lens

There is no tool on this page. 311 makers of cameras and lenses were checked and not one of them publishes a table that turns a serial number into a year. Not Leica, not Nikon, not Canon, not Hasselblad.

Camera serial dating is not undocumented — it is documented almost entirely by collectors, in lists compiled from surviving cameras rather than from factory records. That is somebody else’s work, it is not reproduced here, and the pages that hold it are linked rather than copied.

Leica tell you where the number is, not what it means

Leica publish a page headed Where can I find the serial number of my Leica product? — and it answers exactly that question and no other. On the hotshoe for an M1 through an M10. On the bottom plate for an SL, a Q, a D-Lux, an S, a CL, a T. On the accessory ring for M lenses and the X1. On the tubus for the M lens specials.

Nowhere does it say what any of those numbers mean. It is the most collected camera marque in the world, and the maker’s own page on serial numbers is a map of where to look.

That is not a criticism so much as an observation about what manufacturers think serial numbers are for. A serial number is for warranty and theft, both of which need the number to be found and neither of which needs it to be read. The boat page is the exception that proves it: hull numbers carry a date because a regulation made them.

Zenit built the tool, and it is broken

One maker in the 311 has a serial number page that does something. Zenit’s serial number check takes a number and gives an answer.

It does not work. The page returns a PHP error in place of its form: a required include, notagree-form.php, is missing from their server. That is the same in a browser as it is to an automated request, so it is not a block on us — it is simply broken, and has been for as long as this site has looked at it.

And even working, it would not date anything. It is an authenticity check — is this number one of ours — in the same family as the stolen-bicycle check rather than as a decoder. Worth saying, because a page called “check your serial number” sounds like a dating tool and is not one.

Six of the eight hits were the word “serial” inside something else

The sweep found eight makers with a page that matched. Two are above. The other six are worth listing, because they are a catalogue of how a search for a word goes wrong:

Zeiss and Fujifilm are not in that table, and an earlier draft of this page had them in it. Both went over the time limit on this sweep and were never read, so anything said about them would have come from a smaller probe run weeks earlier and since deleted. The page’s own checker caught it. A row citing data that is no longer on disk is exactly the fault this site keeps finding in other people.

That brings the count of substring faults recorded on this site to eighteen, after stamp, updating, serialization in pharmaceuticals, serial dilution in laboratories, and Danish serien on the heavy plant page. Searching for a word inside other words is the surest way to get a number that looks like a finding and is not one.

What was checked

The pool is 311 camera and lens makers, listed in camera-makers.txt, with websites from Wikidata’s official-website property rather than guessed at.

Wikipedia has no category for camera manufacturers. Nor for camera lens manufacturers, digital camera manufacturers, photographic lens manufacturers or optical companies. Every one of those names was tried and every one is absent. The pool comes from Photography companies, Photography equipment manufacturers and Movie camera manufacturers instead, and photographic retailers and studios were skipped by name because a shop does not stamp a serial number on anything.

And read the swept figure knowing how much was there to read. Of the 120 counted as swept, 53 offered this method fewer than 25 pages to look at, and 47 of those offered nothing from a sitemap at all. A host that answers, allows us, and then has almost nothing to search still counts as swept. It is the number of doors opened, not the number of rooms searched.

Of the 61 not probed: 33 did not answer at all, 8 returned 403 on robots.txt itself, 7 went over the time limit, 5 disallow us along with everybody else, 0 read fine and then refused the page, and 3 block us by name.

Read the swept figure as swept, not as cleared. This method has demonstrably missed makers who do publish, on Zippo, Ludwig and Rheem. It is blind to anything behind JavaScript, inside a PDF, or four clicks from the home page.

This is the sweep that showed how little “swept” can mean

Canon’s sitemap offered this method fourteen pages to look at. Ricoh’s offered none. Pentax’s none. ARRI’s none. All four are counted in the swept figure above, alongside Leica, whose sitemap offered 11,634.

Saying “Canon publish no serial decoder” on the strength of fourteen pages would be a finding invented out of a thin sitemap — the same mistake as reading a timeout as an answer, with a 200 status code instead. So it is not said here, and the figure below is now stated on every sweep page on this site because of what this one turned up.

Three makers asked us not to, by name

123RF, DxO Labs and Ilford Photo carry Disallow: / for ClaudeBot or Claude-Web in their robots.txt. Their sites were not read, and there is no workaround here.

What the pool got wrong, stated rather than tidied

Three retailers are in the list — Dixons, Doi and Henry’s — despite photographic retailers being skipped as a category. They are filed under Photography companies by country instead, so skipping the retailer category by name did not catch them.

They are left in and named rather than quietly removed. A pool that has been hand-corrected is no longer a pool anybody can reproduce, and two of the three were found by this page only because their shops sell USB-to-serial cables.

What to do instead

An electronic camera is full of chips, and a chip carries a date code that is an industry standard rather than a maker’s secret. The chip date code reader decodes it, and the synth page explains how to read a whole boardful at once: the latest code you find is the earliest the camera can be.

For the serial number itself, the collector lists are the route, and they are good. They are also somebody’s unpaid work, compiled from cameras that happened to surface, and they say so themselves more honestly than most manufacturers do.

You can also drop the number into the box that reads every scheme on this site. It will probably tell you nothing, and it will say so plainly rather than guessing.