Archive for: tamron

Cool Tamron Patent

Cool Tamron Patent

I know, I said “cool” and Tamron in the same sentence. It’s true though.

Want to IS/VC your lenses? Just add this converter!

  • Applications from Tamron
  • Patent Publication No. 2001-33692, 2001-33693, 2001-116994
  • Actuator and a shake correction
  • Power the camera from the supply, or battery use
  • With ON-OFF switch

Google Translated Link

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Tamron Lens Phenomenon Update

First reports of repaired lenses.
The first set of Tamron owners have received lenses back from Tamron correcting the cross-type sensor issue with certain Canon DSLR bodies.

The 17-50 f/2.8 VC was sent in and Tamron’s official statement for the fix was “autofocus adjustment”. This is a bit deceptive, what actually was done was a lens ID change from 37 to 137 (85 f/1.2L II lens ID).

Tamron Japan has not officially admitted that there is an issue. Perhaps this is being done to avoid a mass recall of lenses.

Cost of repair?
For the moment, the lens ID switch is covered under the standard warranty. No word on out of warranty products yet.

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Tamron Lens Phenomenon Update

UPDATE #2
New Information about that phenomenon, which is not just a Tamron phenomenon anymore. A guy at the DSLR-forum replaced the Lens-IDs with an EF adapter and found out that the cross-type sensors won’t work on Lenses with the following IDs: 27, 30, 35, 37, 38, 193, 194, 195).

So Tamron was just unlucky by taking the wrong IDs.

The following Canon lenses are also affected:

  • 27 = Canon EF 35-80mm f/4-5.6 (I)
  • 30 = Canon EF 35-105mm f/4.5-5.6
  • 35 = Canon EF 35-80mm f/4-5.6 II
  • 37 = Canon EF 35-80mm f/4-5.6 III
  • 38 = Canon EF 80-200mm f/4.5-5.6
  • 193 = Canon EF 35-80mm f/4-5.6 USM
  • 194 = Canon EF 80-200mm f/4.5-5.6 USM
  • 195 = Canon EF 35-105mm f/4.5-5.6 USM

Link: http://www.dslr-forum.de/showpost.php?p=7463669&postcount=407

thanks Jorg

UPDATE
The Tamron 70-200 f/2.8 is also confirmed to have the issue with the 40D, 50D and 7D outer focus points not being crosstype.

7D Affected
A few days ago we reported some Tamron lenses weren’t using the outer crosstype sensors on the Canon 50D.

Tamron Europe has confirmed the Canon 7D and Tamron 17-50 f/2.8 VC also exhibit the same issue.

We’re still waiting for an official response from Tamron in Japan.

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Tamron Lens Phenomenon

Interesting issue with Tamron Lenses
I received this information a while back, I didn’t post it until there was some kind of response from Tamron.

The following is a direct quote from the folks that found the problem. Tamron’s response is at the bottom.
i am a member of the german dslr-forum (www.dslr-forum.de), which is probably the biggest german speaking community regarding all DSLR-topics (not only Canon). We observed a phenomenon where the followings lenses won’t use the outer cross-type sensors of EOS 40/50/60/7D cameras right.

The lenses that show this problem are (all Tamron):

  • 17-50 f/2.8 VC
  • 60 f/2 Macro
  • 70-200 f/2.8
  • 10-24 f/3.5-4.5

To get a bit more into the detail of the problem – on the 40/50/60D cameras the outer cross-type sensors only work as line-type sensors. To be a bit more correct, they actually work in the same direction as they would work on cams like the 30D or like the 400/450/500/550D. When it comes to the 7D the outer sensors are also only working as line-type sensors (but it seems, that the EF 50 1.2L also has problems to use them correct).

The center cross-type sensor does work at least as a single-cross type sensor (infact we don’t now how to test if the center sensor is working as a dual-cross-type sensor like it’s supposed to work with those f/2.8 and better lenses).

Tamron seems to not know about this behaviour so far. Well – at least, they didn’t confirmed the problem and only said, that they will investigate this.

Maybe a small addition – the Tamron 17-50 VC uses the same lens-ID as the EF 35-80 – maybe you’ll have the chance to check whether this Canon-lens performs correctly or not.

The link to the thread is: http://www.dslr-forum.de/showthread.php?t=732360

Tamron Europe’s Official Response
Dear Mr. S.,

we were able to reproduce the situation where the Tamron 17-50 VC (B005) and the Tamron 60 Macro (G005) won’t use the Canon EOS 50D cross-type sensors correctly.

We have given this information to Tamron in Japan and we are expect an answer very soon.

Best regards
Tamron Europe GmbH

Thanks Joerg

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