Home · Register · Join Upload & Sell

Moderated by: Fred Miranda

New fredmiranda.com Mobile Site

New Feature: SMS Notification alert

New Feature: Buy & Sell Watchlist

FM Forums | Canon Forum | Join Upload & Sell

Archive 2011 · What's wrong with this lens?

mogbert
Offline
• •
Upload & Sell: On

p.1 #1 · p.1 #1 · What's wrong with this lens?

It's a Sigma 24-60mm.

One minute I take a shot and it's fine and not a minute or two later, I look through the viewfinder and it looks dark and grainy and will not/can not focus. Anyone think they know what's wrong? Would it be worth it to fix it or just sell it as a broken lens? Thanks.

Oct 15, 2011 at 11:35 PM

Methodical
Offline
• • • •
Upload & Sell: On

p.1 #2 · p.1 #2 · What's wrong with this lens?

Could it be the camera? Does it do this with other lenses?

Oct 15, 2011 at 11:38 PM

EB-1
Offline
• • • • • • •
Upload & Sell: Off

p.1 #3 · p.1 #3 · What's wrong with this lens?

Your discription indicates that the aperture is not opening after the exposure. Look in the lens after such an event to see if the aperture is partially closed.

EBH

Oct 15, 2011 at 11:38 PM

Ben Horne
Offline
• • • • • •
Upload & Sell: Off

p.1 #4 · p.1 #4 · What's wrong with this lens?

My first thought was also that the aperture is stuck in a stopped down state at times. You can confirm this by placing the camera in Aperture priority mode, setting it to about f/22, then looking through the front of the lens and pressing the DOF preview button over and over. You'll likely see that it has a tendency to get hung up at times.

Oct 15, 2011 at 11:42 PM

RazorTM
Offline
• • •
Upload & Sell: Off

p.1 #5 · p.1 #5 · What's wrong with this lens?

Could be that you're accidentally pressing the Depth of Field Preview button on your camera...

Actually, it's the most likely thing since you can't focus while it's happening. Watch how you hold the camera.

Oct 15, 2011 at 11:42 PM

mogbert
Offline
• •
Upload & Sell: On

p.1 #6 · p.1 #6 · What's wrong with this lens?

Sorry, I should've made myself more clear. I meant, the lens no longer has a clear view through the view finder. It is broken but I'm just not sure what's wrong. It didn't drop between working and no longer working. I just took one last shot with it and it was fine. And then I looked through the viewfinder again and it was dark and grainy. I cannot autofocus but if I take a shot in manual mode the photo will look fine.

Oct 15, 2011 at 11:48 PM

Ben Horne
Offline
• • • • • •
Upload & Sell: Off

p.1 #7 · p.1 #7 · What's wrong with this lens?

mogbert wrote:
Sorry, I should've made myself more clear. I meant, the lens no longer has a clear view through the view finder. It is broken but I'm just not sure what's wrong. It didn't drop between working and no longer working. I just took one last shot with it and it was fine. And then I looked through the viewfinder again and it was dark and grainy. I cannot autofocus but if I take a shot in manual mode the photo will look fine.

You were very clear with your first post, and perfectly described an sticky aperture. An aperture that's stuck in the closed position will result in slow/bad/no autofocus because the AF sensor does not receive enough light to do its job.

Do the DOF preview trick I mentioned in my last post, and I think you'll see for yourself that you have an aperture that tends to get stuck at times.

Oct 16, 2011 at 12:19 AM

mogbert
Offline
• •
Upload & Sell: On

p.1 #8 · p.1 #8 · What's wrong with this lens?

Ahh, thanks! I should've posted this earlier. I'm currently overseas and left it back home because I couldn't figure it out. I will once I return home and hopefully it'll work!

Oct 16, 2011 at 02:31 AM

form
Offline
• • • •
Upload & Sell: Off

p.1 #9 · p.1 #9 · What's wrong with this lens?

It's a Sigma lens. No explanation is necessary, just send it in or sell it.

Oct 16, 2011 at 10:17 AM

Jonathan Huynh
Offline
• • • • • •
Upload & Sell: Off

p.1 #10 · p.1 #10 · What's wrong with this lens?

RazorTM worte:
Could be that you're accidentally pressing the Depth of Field Preview button on your camera...

++++

Oct 16, 2011 at 12:14 PM

mogbert
Offline
• •
Upload & Sell: On

p.1 #11 · p.1 #11 · What's wrong with this lens?

Thanks guys! You guys were right! It was fixed by continually pressing the depth of field preview button.

Feb 09, 2012 at 07:18 PM

BrianO
Offline
• • • • •
Upload & Sell: Off

p.1 #12 · p.1 #12 · What's wrong with this lens?

mogbert wrote:
Thanks guys! You guys were right! It was fixed by continually pressing the depth of field preview button.

That's not a fix, that's a test.

Unless you lubricated it or adjusted the blades, it's apt to stick again sooner or later.

Feb 10, 2012 at 12:18 AM


FM Forums \| Canon Forum \| Join Upload & Sell

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.