Guy Mancuso
Administrator, Instructor
Not sure why some folks took offense here to folks opinions but my choice has been not to use them. I think there certainly valid reasons either way myself. I have always been in the camp of taking the risk and not use them since optically there is no benefit too using them so why bother but of course they do offer protection to maybe save a lens element but since they don't provide a optical advantage than I chose not to use them. It's actually a pretty simple decision if you want protection use them if you are willing to take the risk than don't. But bottom line optically there is not a advantage to use them. And yes they do cause some issues but my choice is always go with the optical advantage be it perceived or real.