Tamron SP 24-70mm Canon Mount over exposed

Sigma 12-24mm f/4.5-5.6 EX Aspherical DG HSM for Nikon

08/24/2013 10:39:39 PM · #1

Does anyone know what is the issue? I am start seeing this very in last couple of weeks and the problem is it is out of return policy but still in tamron warranty and not sure how well Tamron guys would treat and solve problem.

When I am at aperture like 2.8, 4.5 image looks good but when I go higher values like f9 and above the image start getting over exposed. see below image for reference.

This test is in AV mode and saw same behavior in Tv too.

Message edited by author 2013-08-24 22:41:00.

bohemka

Nikon D700

08/24/2013 10:53:58 PM · #2

It looks like you are getting closer and closer to light speed, so this is perfectly normal.

08/24/2013 11:17:03 PM · #3

Looks to me as though the aperture is not functioning.

The camera is expecting it to stop down, and is adjusting the exposure program for that expected change. Which appears to not be happening.

Here's a test - find your DOF preview button, set the aperture to f/22, and press the DOF preview button while looking through the viewfinder - did everything get really dark? If not, then your aperture is bonked.

08/24/2013 11:21:22 PM · #4

Originally posted by Cory:

I am going to test it in few minutes. meanwhile I tried to do the same with other lenses including 24-105 f4.0 and 85mm f1.8 and I didn't see this behavior with those lenses.

Sigma 12-24mm f/4.5-5.6 EX Aspherical DG HSM for Nikon

08/24/2013 11:26:05 PM · #5

Originally posted by pgirish007:

Originally posted by Cory:
Looks to me as though the aperture is not functioning.

The camera is expecting it to stop down, and is adjusting the exposure program for that expected change. Which appears to not be happening.

Here's a test - find your DOF preview button, set the aperture to f/22, and press the DOF preview button while looking through the viewfinder - did everything get really dark? If not, then your aperture is bonked.

I am going to test it in few minutes. meanwhile I tried to do the same with other lenses including 24-105 f4.0 and 85mm f1.8 and I didn't see this behavior with those lenses.

I tested with 24-70 it tries to go dark but not really goes where as I did the same with 24-105mm and it goes very dark. What you said is happening with other lens but not with 24-70mm

bohemka

Nikon D700

08/24/2013 11:27:49 PM · #6

Originally posted by pgirish007:

Bizarre that it's lens-specific. Cory might be onto the aperture thing still, though. Perhaps the aperture lever/connection for that lens is busted.

I was thinking/hoping more inexpensively (before you mentioned that all is well with other lenses), and that you may have mistakenly activated an exposure bracketing function.

08/24/2013 11:30:04 PM · #7

Originally posted by pgirish007:

Originally posted by pgirish007:

Originally posted by Cory:
Looks to me as though the aperture is not functioning.

The camera is expecting it to stop down, and is adjusting the exposure program for that expected change. Which appears to not be happening.

Here's a test - find your DOF preview button, set the aperture to f/22, and press the DOF preview button while looking through the viewfinder - did everything get really dark? If not, then your aperture is bonked.

I am going to test it in few minutes. meanwhile I tried to do the same with other lenses including 24-105 f4.0 and 85mm f1.8 and I didn't see this behavior with those lenses.

I tested with 24-70 it tries to go dark but not really goes where as I did the same with 24-105mm and it goes very dark. What you said is happening with other lens but not with 24-70mm

Sounds to me like the aperture blades are stuck. They're going to a point, then ceasing to move around f/5.6 or so.

Time for service, no doubt.

08/24/2013 11:38:40 PM · #8

Originally posted by Cory:

Originally posted by pgirish007:

Originally posted by pgirish007:

Originally posted by Cory:
Looks to me as though the aperture is not functioning.

The camera is expecting it to stop down, and is adjusting the exposure program for that expected change. Which appears to not be happening.

Here's a test - find your DOF preview button, set the aperture to f/22, and press the DOF preview button while looking through the viewfinder - did everything get really dark? If not, then your aperture is bonked.

I am going to test it in few minutes. meanwhile I tried to do the same with other lenses including 24-105 f4.0 and 85mm f1.8 and I didn't see this behavior with those lenses.

I tested with 24-70 it tries to go dark but not really goes where as I did the same with 24-105mm and it goes very dark. What you said is happening with other lens but not with 24-70mm

Sounds to me like the aperture blades are stuck. They're going to a point, then ceasing to move around f/5.6 or so.

Time for service, no doubt.

Yaa but not even a 2 months old :)

08/24/2013 11:42:55 PM · #9

Originally posted by pgirish007:

Originally posted by Cory:

Time for service, no doubt.

Yaa but not even a 2 months old :)

What'd you do to it? ;)

Seriously though, better now than after the warranty expires. I had to send my 100-400 back for an AF issue in the first couple of months - it happens, no biggie. Just get it fixed up.

Message edited by author 2013-08-24 23:43:48.

08/24/2013 11:45:08 PM · #10

Originally posted by Cory:

Originally posted by pgirish007:

Originally posted by Cory:

Time for service, no doubt.

Yaa but not even a 2 months old :)

What'd you do to it? ;)

Seriously though, better now than after the warranty expires. I had to send my 100-400 back for an AF issue in the first couple of months - it happens, no biggie. Just get it fixed up.

Yes I am trying to get hold of them and trying to find out if they have any local service center in NJ.

Canon RF 24-70mm f/2.8 L IS

08/28/2013 10:32:28 AM · #11

bad news and good news!

Bad news - I got this lens from Amazon warehouse where someone ordered and returned with-in 3 days so I got a low price for the lens. Now hit with this issue and sent to Tamron to cover it under warranty and they refused because as per them I became second owner even though first owner never registered the lens with them. They ask me to pay $250 to fix the lens.

Next step: I called back Amazon and discussed the issue and they didn't know that the lens had problem so move on to the next step:

Good news: Amazon is going to return the product back and they are doing price adjustment of the new lens to cover the difference that I paid for the used one. The reason is because used product does not have warranty and also it is not transferable so nothing can be done to anyone who buys a used product. I ordered new one and got price adjustment too! so final cost same as used one but going to get a new lens with 6 years warranty :)

By the way here are the photographs of Tamron 24-70 lens. The results are promising and do feel that it is a good lens not just result but when it comes to the price that I will have to pay if go with Canon 24-70 2.8.

kirbic

Canon EOS R5

08/28/2013 11:29:34 AM · #12

Great outcome. I would understand Tamron's reluctance to cover it under warranty if you were really the second owner, but this was an open-box return, not a used lens. I think they should have been more understanding. Kudos to Amazon for making it right.

08/28/2013 11:51:30 AM · #13

This is what I got from Tamron research about my lens!

Symptoms: P POOR COMMUNICATION OR CONTACT PROBLEM
A APERTURE NOT OPENING/CLOSING CORRECTLY
D DUST OR DEBRIS INSIDE LENS
Repairs: P ADJUST OR REPLACE CONTACTS.
A ADJUST OR REPLACE APERTURE ASSY.
D DISASSEMBLE AND CLEAN ENTIRE LENS.
2 TURNAROUND TIME APPROX 3 BUSINESS DAYS
TAMLNS EA Rec'd:Fr Cap,Rear Cap, 1
POP-INVALID.
TAFA007 EA Repair Charge - 35mm Lens A007 1 250.00 250.00

Panasonic LUMIX DMC-LX100

08/28/2013 12:20:31 PM · #14

Originally posted by pgirish007:

:) Yay. Looks like my assessment was spot on.

..

I'm a bit dismayed with Tamron's support in this case - but as always, Amazon made it right. Love that place.

spiritualspatula

Nikon AF-S NIKKOR 24-70mm f/2.8G ED

08/29/2013 06:44:21 AM · #15

To be fair, this is a very fast response for repair, and I'd no expectation that Tamron cover a 2nd party lens. Canon and Nikon would surely not care, the rp was saved by amazon.

Sony 24-70mm F4 Vario-Tessar T* FE OSS

08/29/2013 09:42:04 PM · #16

Final update!

I received both lenses New one from Amazon and the old one from Tamron. New one tested with the issues that I had with older and everything is working fine! Old one is going back to Amazon tomorrow!

Thanks everyone for your feedback and suggestions without that this would not have happened!

Bear_Music

Samsung Galaxy S24 Ultra

08/29/2013 09:53:26 PM · #17

Presumably you mean "without" the issues?

08/29/2013 10:00:33 PM · #18

Originally posted by Bear_Music:

Presumably you mean "without" the issues?

Yup new one is working as expected, Thanks Robert!

Sony 24-70mm F4 Vario-Tessar T* FE OSS

08/30/2013 07:32:51 PM · #19

I took this image today and thought to share it with you! Looking at result It feels awesome!

Bear_Music

Samsung Galaxy S24 Ultra

08/30/2013 10:04:15 PM · #20

Very nice!

Tiberius

Samsung Galaxy S22, S22+, S22 Ultra

Panasonic Lumix G 14mm F2.5 ASPH

08/31/2013 01:44:53 AM · #21

Cool