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<blockquote data-quote="SteveH" data-source="post: 739667" data-attributes="member: 9252">Hi All,My Sigma 150-600 C is currently off with Sigma as I somehow managed to get some fungus growing inside, so I thought I'd have it properly removed before it got too bad. While reassembling and testing the lens, they reported that the OS motor needs replacing.This is the second time this has needed replacing, as within a week of buying the lens 4 years ago, it became very noisy. So I have asked Sigma if I have a bad copy, or is there something in particular that I'm doing wrong with the lens that is damaging it (A polite way of asking if OS system is particularly weak)Sigma have responded today with &quot;We would suggest turning the OS off when the lens is removed from the camera.&nbsp; The OS is a floating optic that moves into its active position when powered.&nbsp; If the lens is removed when its still in its active position then it could be vulnerable.&quot;I don't remove the lens while the OS is still active, but it generally switches off about 2 secs after releasing the shutter button, so I wonder if they mean the element is floating all the time until the system is switched off, or the power is cut by removing the lens? Has anyone else had similar issues with the 150-600? Google searches don't show this as a common problem...</blockquote>

[QUOTE="SteveH, post: 739667, member: 9252"] Hi All, My Sigma 150-600 C is currently off with Sigma as I somehow managed to get some fungus growing inside, so I thought I'd have it properly removed before it got too bad. While reassembling and testing the lens, they reported that the OS motor needs replacing. This is the second time this has needed replacing, as within a week of buying the lens 4 years ago, it became very noisy. So I have asked Sigma if I have a bad copy, or is there something in particular that I'm doing wrong with the lens that is damaging it (A polite way of asking if OS system is particularly weak) Sigma have responded today with "[FONT=Arial][COLOR=#ee82ee]We would suggest turning the OS off when the lens is removed from the camera. The OS is a floating optic that moves into its active position when powered. If the lens is removed when its still in its active position then it could be vulnerable.[/COLOR]" I don't remove the lens while the OS is still active, but it generally switches off about 2 secs after releasing the shutter button, so I wonder if they mean the element is floating all the time until the system is switched off, or the power is cut by removing the lens? Has anyone else had similar issues with the 150-600? Google searches don't show this as a common problem...[/FONT] [/QUOTE]

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