Frozen shutter

[Hellashot]

The shutter of my EF 75-300 III is apparently frozen with a very small opening. I've cleaned the contacts, have tried in on a film body, taken the batteries out of my Drebel. It'll either shoot (manual focus only) and give a black image, or give Err-99. When setting it to AF it will just very slowly hunt.

Any suggestions? It's only a $180 lense that didn't seem to be the greatest to begin with.

[ron chappel]

The part that is stuck is called that aperture.
It sounds like you've done all the right things to get it working-it's likely to need professional help.
Sorry

[lost]

The last thing you should do, right before you buy another, is jar the lens. This could do possibly 3 things. Break it beyond repair, free the aperature, or nothing. :)

This would be a last resort and I would do only right before I placed the order for the replacement.

Or you could try to have it repaired. (useless in my opinion for such an inexpensive lens)

Good Luck

[DocFrankenstein]

The last thing you should do, right before you buy another, is jar the lens. This could do possibly 3 things. Break it beyond repair, free the aperature, or nothing. :)
I don't beleive it can free the aperture, because you need electricity for that.

And it's probably the diaphragm that's stuck, not the aperture.

[lost]

Please explain the difference between the aperature and diaphragm. I thought they were one in the same.

[robertwgross]

Please explain the difference between the aperature and diaphragm. I thought they were one in the same.

The diaphragm is made up of blades that close down or open up inside the lens. The aperture is the "hole size" that is produced by the diaphragm. So, the two terms refer to the same thing, but in a different way.

---Bob Gross---

[cmM]

just a matter of terms. Diaphragm sets aperture. The physical part is the diaphragm.

[lost]

Ok just as I suspected. The aperature is the actual hole created by the diaphram blades. Well I was way off ;).

[2goldens]

I may have it fixed. I would spend about 1/2 the price for a new one to fix the old. If they told me that it would be more to fix it, then I will get a new one.