Tamron Lens Phenomenon -- Canon Lenses in photography-on-the.net forums

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Nov 05, 2010 15:36 | #1

I just saw this post over at Canon Rumors and thought some here would be interested:

Tamron Lens Phenomenon

from Canon Rumors » Blog Archive » New Video Camera? by Canon Rumors

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

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richardfox

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Nov 05, 2010 16:45 | #2

Aaaaand, this is why I stick with Canon lenses.

Canon 50D gripped, EF 50/1.8, EF-S 10-22, 17-40L, 24-105L, 70-200 f/2.8L, 100/2.8 macro, 100-400L, 300 2.8L, Canon 500 f8 mirror with chipped EF mount, 580EX, 1.4x and 2x Canon teleconverters, Canon EF Life-Size converter.

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District_History_Fan

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Nov 05, 2010 16:45 | #3

Color me surprised...

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themadman

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Nov 05, 2010 16:48 | #4

I don't own any Tamron lenses but I am kinda surprised regardless.

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stax
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Nov 05, 2010 16:53 | #5

themadman wrote in post #11232227

I don't own any Tamron lenses but I am kinda surprised regardless.

Same here. I am mostly surprised that it took this long to identify the problem.

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Replaces

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Nov 05, 2010 16:53 | #6

oh wow
this is.... surprising -__-

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CountryBoy

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Nov 05, 2010 16:58 | #7

richardfox wrote in post #11232206

Aaaaand, this is why I stick with Canon lenses.

I guess you missed the part where it said the Canon 50mm L has the same problems

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bohdank

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Nov 05, 2010 18:04 | #8

I am very curious to hear an explanation of why/how this happens. The lens/body do not communicate which sensor is being used. Why would the lens care and it suggests that Canon bodies in such a way that a cross sensor can switch off one of it's lines. Again, very curious.

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gjl711

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Nov 05, 2010 18:15 | #9

I'm just wondering how a lens can affect the performance of the AF chip. Isn't an image circle an image circle no matter what glass is put in front of it?

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CountryBoy

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Nov 05, 2010 22:12 | #10

bohdank wrote in post #11232568

Very interesting :confused: . I'm very curious also .

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sangjiny

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Nov 05, 2010 22:21 | #11

CountryBoy wrote in post #11233721

Very interesting :confused:

. I'm very curious also .

+1 very curious.

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Jam.radonc

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Nov 06, 2010 05:30 | #12

Whoa! That interaction between the 50L and the 7D is very interesting. That very much kinda put a stop on me buying the 7D this weekend but how is that even possible?

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yogestee

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Nov 06, 2010 10:02 as a reply to @ Jam.radonc's post | #13

"Canon Rumors" :rolleyes:

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Logicus

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Nov 06, 2010 10:42 | #14

My tamron 70-200mm works perfectly with both my 40d and 450d? As does my tamron 10-24mm and so did my friends Tamron SP AF17-50mm F/2.8 XR Di II...

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Nov 06, 2010 10:49 | #15

Jam.radonc wrote in post #11234765

Whoa! That interaction between the 50L and the 7D is very interesting. That very much kinda put a stop on me buying the 7D this weekend but how is that even possible?

Indeed, that is intrigueing, especially for a lens like the 50L where precise focus is HIGHLY important

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