FAQ

Which lenses won't be added to the database?

We don't record:

  • lenses designed for formats other than medium format (up to 6x7), 35mm full frame or APS-C,
  • pre-WWII lenses, except for Leica screw mount lenses,
  • vintage lenses with aperture controlled from the camera body only, including but not limited to: Deckel (DKL) and Topcon UV mount lenses,
  • lenses with external automatic diaphragm, including but not limited to: lenses with Alpa or Exakta mount, Tokyo Kogaku Auto-Topcor lenses, Miranda dual mount lenses with Pressure Automatic Diaphragm,
  • lenses with Altix, Bronica Classic, Canon J (+ Nippon-Kogaku focusing mount), Olympus OM AF, Pentacon Six, Petri, Practica B, Voigtlander Prominent, Yashica AF, Yashica Pentamatic mounts,
  • lenses of little-known brands, including but not limited to: Acall/Kyoei, Access, Accura, Albinar, Asanuma, Beroflex, Berolina, Bower, Cambron, Carena, Centon, Chinon, Computar, Cosmicar, Danubia, DeJur, Elicar, Focal, Formula 5, Hanimex, JC Penny, Kaligar, Kalimar, Kawanon, Kenlock, Kobori, Komine, Komura, Lensbaby, Lomography, Makina, Old Delft, Opteka, Optomax, Osawa, Ozeck, Pallas, Panagor, Paragon, Pentor, Petri, Phoenix, Photax, Porst, Prinz, Pro Optic, Promaster, Promura, Quantaray, Revuenon, Rokinon, Sakar, Samigon, Sears, Sirius, Soligor, Spiratone, Starblitz, Sun, Sunagor, Tefnon, Telesar, Tou/Five Star, Unitor, Universar, Upsilon, Varexon, Vitacon, Vivitar (non Series 1), Walimex, Weltblick, Wollensak,
  • Cosina manual focus lenses (before the company began to use the Voigtlander brand), Kiron manual focus zoom lenses, Sigma manual focus zoom lenses, Sigma YS lenses, Sigma XQ lenses, Tokina manual focus lenses (due to inconsistencies in specifications in the company's materials over the years and release of versions with different optical formulas under the same name), Rikenon P manual focus zoom lenses for the Ricoh K mount (as most of them were rebranded lenses from such third-party manufacturers as Cosina, Sigma and Tokina), YUS (Yashica US) lenses due to the total lack of manufacturer information,
  • lenses made by the following German manufacturers: A. Schacht München/Ulm, Carl Zeiss Jena, Enna München, Isco (Optische Werke) Göttingen, Meyer-Optik Görlitz, Pentacon Dresden, Rodenstock München, Steinheil München,
  • Soviet/Russian lenses, including but not limited to: Granit, Helios, Industar, Jupiter, Kaleinar, Mir, Peleng, Rubinar, Russar, Tair, Telear, Telemar, Vega, Volna, Yantar, Zenitar, Zodiak,
  • Chinese lenses (not gonna even bother making a list of brands),
  • lenses developed for military applications (for example, ELCAN lenses made by Ernst Leitz Canada for U.S. Navy),
  • CCTV, projection, cine, stereo, enlargement, microscope lenses,
  • lenses designed for twin-lens reflex cameras,
  • lenses designed for use with reflex housing (Canon Mirror Box, Leica Visoflex, Zeiss Ikon Panflex, etc.),
  • autofocus lenses designed for manual focus cameras,
  • body cap lenses,
  • attachment lenses,
  • telecompressors,
  • prototype lenses.

Website A states different information about lens B. Do you plan to bring your information in line with that website?

On our website, lens specifications are unified and filled out strictly on the basis of data contained in booklets or instruction manuals published by lens manufacturers. We do not use unverified information (i.e. private information not based on manufacturer documents). Because similar independent websites never state their sources, we are not interested in any information from them, and we never sync with them.


Why are there no lens ratings on your website?

We do not believe that ratings can reflect an objective view of a particular lens. Any assessment is always subjective and often does not take into account the whole complex of factors that have a significant impact on performance of the lens.

In particular:

  • The sharpness of the final image depends on the combination of camera and lens used. In addition to focal length and aperture, sharpness can also be affected by focusing distance: conventional lenses are optimized to provide the best image quality when focusing at infinity, and therefore may exhibit reduced image quality at short to medium distances;
  • The bokeh depends on the DISTANCE between the camera and the subject (the smaller it is, the more the background is blurred), as well as the DISTANCE from the subject to the background (the larger it is, the more the background is blurred);
  • The autofocus performance of a lens depends on factors, not all of which are directly related to the lens itself: available lighting, autofocus algorithms used by the camera, contrast of the subject, focusing distance, and much more;
  • The resistance to flare depends on whether the original lens hood is used with the lens.

Are you sure that users who rate lenses on other websites are aware of all these factors and are taking any careful account of them?..


Do you collect information about lens serial numbers?

Sorry, but we do not collect this kind of data. We do understand that sometimes serial numbers are important and useful (especially in the case of Nikon and Leica lenses), because they can help to distinguish one variant of the lens from another, roughly determine the year of production etc. Anyway, currently we do not have any plans to record sets of serial numbers in our database.


Do you sell cameras, lenses or other photographic equipment?

No, we don't sell anything. Nevertheless, there can be links on the pages of our website to online stores or private sellers of photographic equipment, which we consider reliable and whose services we often use when we want to purchase photographic equipment.


Can you please help me determine the original or current market price of the lens?

Sometimes users of our website have been questioning us in the comments about original or current market prices of certain lenses. Typically, these questions are due to the fact that such users plan to sell lenses on marketplaces (for example, eBay).

Please be informed that our website specializes solely in providing information about lenses. We do not sell them or track their prices: it's just not interesting to us. We also do not provide users with the opportunity to place advertisements. Therefore, we cannot help you determine the original or current market price of a particular lens.

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Sierra Anderson
Sierra Anderson
10 months ago

Hiya! I’m curious to know if there is an API available for your site – I’m looking to build a discord bot & it would be a really good way to implement getting lens specifications

Giovanni Gatto
Giovanni Gatto
7 months ago

I would have asked the same. Would you allow to do it as open source contribution?

Giovanni Gatto
Giovanni Gatto
7 months ago

To make the data referable and augmentable. I collect lenses for example, and write an inventory in a spreadsheet, but all the raw data already existing on your website, has to be entered manually for each one. Also as the name API suggests, one could write apps that work with your data, including your own ones, like the website. It is a good practice to decouple the GUI and the database this way. Also, it is precious data, publicly accessible anyway, just not so convenient as it could be, but that is maybe my minority philosphy.

KK Low
KK Low
5 months ago

HI, I have a Rolleiflex 6008i Apo Symmar lens that is having error issues with the 6008i body. I believe it is the lens internal problem and would like your advise on which part in the world is Service being offered for such Rolleiflex equipment. As I am from Malaysia I would prefer an Asian centre. Thank you.

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