ron_togger Posted July 31, 2008 Share Posted July 31, 2008 Hi Everyone, During a routine clean, I noticed the rear element gives way slightly when pressed - rather like a button. The pressure applied was slightly greater than normal (as I was cleaning a stubborn mark), but certainly not excessive. Apart from this movement (which stops dead at about 0.5mm), the glass does not seem loose and there are no loose artefacts/debris inside the barrel to suggest any damage or tampering. I cannot for the life of me work out whether this is a fault, or some kind of design feature. I always treat my gear with great care (verging on the obsessive), the lens was bought in mint condition from a dealer and has never suffered in any way. All the screws are pristine and the mount is perfect. Had I not cleaned it, I probably would have been blissfully unaware of this curious situation. Has anyone ever come across such a thing on a lens? Please put me out of my misery. Many thanks Ron Link to comment Share on other sites More sharing options...
juanjo_viagran Posted July 31, 2008 Share Posted July 31, 2008 if I'm not wrong the rear element on that lens is screw in... maybe it got a little loose, you could try to screw it and see if woks. <img src="http://i215.photobucket.com/albums/cc112/Juanjo_Viagran/BS/DSC_3073.jpg"> Link to comment Share on other sites More sharing options...
robert_hooper1 Posted July 31, 2008 Share Posted July 31, 2008 I don't have this lens, but does the rear element move in and out when you turn the focus ring? If not, I would assume that the element is designed to remain completely stationary and you should have it looked at by a repair technician. Link to comment Share on other sites More sharing options...
mars790 Posted July 31, 2008 Share Posted July 31, 2008 I just checked mine and it is firmly in place. Link to comment Share on other sites More sharing options...
ron_togger Posted July 31, 2008 Author Share Posted July 31, 2008 It's weird - almost like the rear element is mounted on some kind of tension spring which sits within the mounting ring and holds the glass against the outer mount. It is only noticeable with slightly more pressure, it does not rattle or stay depressed once you take the pressure off. Link to comment Share on other sites More sharing options...
gary_watson Posted July 31, 2008 Share Posted July 31, 2008 That's what's known as a "floating element." Your misery's well-deserved if you're scrubbing away on a rear element. OCD issues, Ron? Link to comment Share on other sites More sharing options...
bmm Posted August 1, 2008 Share Posted August 1, 2008 Mine seems to be firm and doesn't move... Link to comment Share on other sites More sharing options...
ron_togger Posted August 1, 2008 Author Share Posted August 1, 2008 Ah well, off to the tech it goes then. And no, I don't think I've quite reached OCD stage yet but I may well have to be treated for a cracked rib following the "floating element" comment:) Link to comment Share on other sites More sharing options...
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