Originally posted by filmamigo I hate to say - I might have more than 10 lenses...
I think no one here will blame you for owning many lenses. Many will even find excuse for you if you don't have any. Generic excuse is "you needed them".
I, myself, hate to say I have only 9 lenses.
Back to topic, calibration is good but when it comes to zoom lenses, you cannot memorize several calibration settings depending of focal length setting, only one per lens. This is why I avoided the Tamron 17-50 F2.8 (and took instead the Sigma version), because this lens would need different calibration adjustements depending on focal length chosen. I don't know if there are many other lenses in the same problematic case of that Tamron.