We don't record:
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.
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.
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?..
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.
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.
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.