Canon 100mm Lens odd problem

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prits88
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Canon 100mm Lens odd problem
4 months ago

Hi all.

Just today i have noticed that my camera (canon 550d) and lens(canon 100mm 2.8) are not working properly.

I was taking pictures of something at f19 with a ring flash as i do normally but things were coming out massively overexposed.

I then experimened with no flash and it seems like at large apertures (f2.8ish) the pictures are exposing correctly, but then as i make the apertures smaller, the pictures are coming very overexposed.

I thought this was a fault with my camera at first, so tried a different lens, which worked perfectly, so i think it must be the lens that is at fault.

I have googled various things, and i think it may be a 'sticky aperture'?

I would be so grateful for any advice or how or where this can be fixed.

(i took the following pics to try and illustrate the problem)

https://flic.kr/p/muHf7w

https://flic.kr/p/muFgFP

https://flic.kr/p/muFSnF

https://flic.kr/p/muH8xj

Canon EOS 550D (EOS Rebel T2i / EOS Kiss X4)
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