Hey, guys! I was thinking of collecting more OEM lenses for my X-metals now that we all know that the X-metals are phased out completely. The question is, how long do these lenses last anyway (when kept in storage)? If I am going to buy extra lenses it would only make sense to do so if they will actually last for several years before deteriorating. Do we have any data on this? And if they do last for years and years, does anyone know if there is actual data about ideal storage conditions for the lenses (e.g. temperature range)? Any opinion would be appreciated. Factual data would be most welcome. Thanks!