Sticky Aperture?

Started May 15, 2013 | Discussions thread
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randyh360
Junior MemberPosts: 26
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Sticky Aperture?
May 15, 2013

I recently purchased a used SAL35F18 that seems to have a "sticky aperture", i.e., the aperture doesn't close fast enough resulting in overexposed shots. It seems like a pretty open and shut case, however, the aperture appears to spring shut quickly when it's not attached to a camera. Has anyone ever seen this happen with a newer lens like the SAL35F18, and if so, was it just a faulty lens or something else entirely?

Here's a video of me pressing the DOF preview button repeatedly with the SAL35F18:
https://vimeo.com/66208051

For comparison, here's my Tamron 28-75 F2.8 doing the same thing:
https://vimeo.com/66208050

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