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Stuck aperture blades - Sigma 24-70mm f/2.8 EX for Canon

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Film rewind button at the bottom of the camera stuck on the "in" position. Cannot get it to release.


Put the camera in a change bag open it then manually rewind the film. From there you may be able to free the button. If the button continues to be stuck here is something worth trying that I have seen others do with stuck buttons and aperture blades. To the button add a few drops of lighter fluid let it soak in. Sounds crazy yes, however sometimes that will dissolve gunk buildup freeing the button. That trick works wonders on stuck aperture blades; actually a common practice at repair shops.

May 27, 2015 | Photography

2 Answers

Zenzanon 80


The lens does not have a shutter - that's in the camera body. The lens contains the aperture or f stop adjustment. It is done by injecting or retracting blades in the light stream of the lens barrel between the front and rear optics. Check the aperture blades to see if they move easily and open equally by varying the f-stop ring on the lens while looking through it. If not moving all the blades the same amount or it does not continue to restrict the opening as you increase the f-stop value, there's something wrong with the lens.

Are you sure you haven't accidentally activated any exposure compensation adjustment on the camera body?

Jan 10, 2012 | Bronica 80mm f/2.8 Zenzanon-PS Lens

1 Answer

I have a Canon EOS T2 film camera. The shutter blades appear to be stuck half-open. I have checked with two lenses, it's not the lens. Have replaced the battery, no change. Any suggestions?


It's possible that the gold contacts between the camera and lens are dirty and not making an electrical contact. The DIY fix is to take a pencil eraser and gently polish these contact surfaces both the camera and lens contacts. They look clean but over time accumulate a hazy oxide that prevents proper communication between the camera and body. Also the blades will not move if you have the lens off (no power) the camera as it will be set to the last known aperture. The lens needs to be on the camera to work and operate the aperture.

May 17, 2011 | Canon EOS Rebel T2 with 28-90 lens 35mm...

1 Answer

My Canon 28-135mm IS lens seems to have broken internally. If I try to turn the lens (as in, to manually focus it), it jams before setting to the largest aperture. Moreover, there appears to be a metal...


This lens is a very popular focal length and still a "current" lens it's worth getting an estimate from a repair facility. It sounds as if the aperture blades have come apart, possible just worn out but I find that hard to believe after the more then 150,000 actuation I gave mine.

Jan 17, 2011 | Cameras

1 Answer

When looking through the view finder the image is very dark. I had it in storage for a while and it gets cold in the winter. I wasn't thinking about the temperature effecting it and I really hope I didn't...


Sounds to me as if the aperture is stopped down. It should normally be fully open except during an exposure, to allow viewing at full aperture. Whether it is stuck or whether you have just set the stop-down lock manually I cannot tell from here. If you turn the aperture ring to the fully open end and it is still shut down, then it is stuck. This typically happens when the blades get a bit of oil on them. It can be fixed, but it isn't really a DIY job.

Jan 16, 2011 | Nikon N80 35mm SLR Camera

1 Answer

I'm using Tokina 12-24mm f4 on my Canon EOS 20D.


Most likely something bad has happened. It out of warranty, usually its 5 years. This is a pro job, getting to anything inside a lens is a very special job. There are a number of places to send it out. Check http://www.acecam.com/srindex.html and write to one or two of the places for estimates. It could be $150 or more plus shipping and taxes. A new one is about $400+, you could check around the many on-line camera stores for a used one. Could be a simple electronic part or the iris blades are bad.

Jun 29, 2009 | Tokina 12-24mm /f4.0 for Canon

1 Answer

Aperture stuck at F2.8


It may have lubrication from the zoom on the aperture blades. It will need dis-assembly to clean the blades. I just repaired one earlier this week.

May 25, 2009 | Nikon AF-D 80-200mm f/4.5-5.6 Lens

1 Answer

Nikkor 105mm Ai-S micro lens aperture seems stuck


It does sound like your lens diaphragm/aperture ring coupling mechanism is in need of repair.

May 03, 2008 | Cameras

1 Answer

50mm C lens issue


From your description, Yes. All RB67 lenses have common problems, usually sticky blades. Since there are 2 sets of blades, (shutter and aperture), the shutter blades may be contaminated with oil/debris

Apr 19, 2008 | Mamiya RB67 Pro SD Medium Format Camera

1 Answer

Error message on D40


The guy at the camera store is probably right. The aperture is controlled by a small leg that juts out from the lens mount. This leg/lever moves up and down to open the aperture. It could be stuck or broken. Try holding the lens (small end pointing towards your face) and peer into the lens as if you were taking a picture. Find the aperture guide (a small rectangular lever) and slide it up and down. You should see the aperture blades open and close. If they do, the camera is malfunctioning and in need of repair (warranty?).

Jan 17, 2008 | Nikon D40 Digital Camera with G-II 18-55mm...

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