Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 05 Nov 2010 (Friday) 15:36
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

Tamron Lens Phenomenon

 
stax
Senior Member
Avatar
731 posts
Likes: 1
Joined Aug 2009
Location: Oakland
     
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  (external link)

from Canon Rumors » Blog Archive » New Video Camera? (external link) 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 (external link)), 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.ph​p?t=732360 (external link)

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



http://www.canonrumors​.com …utm_content=Goo​gle+Reader (external link)

http://www.flickr.com/​photos/staxnet/ (external link)

https://photography-on-the.net/forum/showthre​ad.php?t=865770

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
richardfox
Goldmember
Avatar
1,883 posts
Joined Oct 2009
Location: Bellbrook, Ohio, USA
     
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.

  
  LOG IN TO REPLY
District_History_Fan
Goldmember
2,286 posts
Likes: 1
Joined Dec 2008
     
Nov 05, 2010 16:45 |  #3

Color me surprised... ;)


www.ericmcferrin.smugm​ug.com (external link)

  
  LOG IN TO REPLY
themadman
Cream of the Crop
Avatar
18,871 posts
Likes: 14
Joined Nov 2009
Location: Northern California
     
Nov 05, 2010 16:48 |  #4

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


Will | WilliamLiuPhotography.​com (external link) | Gear List and Feedback | CPS Member | Have you Pre-Ordered Your 3Dx Yet? | HorusBennu Discussion | In honor of Uncle Steve, thanks for everything! 10-5-2011

  
  LOG IN TO REPLY
stax
THREAD ­ STARTER
Senior Member
Avatar
731 posts
Likes: 1
Joined Aug 2009
Location: Oakland
     
Nov 05, 2010 16:53 |  #5

themadman wrote in post #11232227 (external link)
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.


http://www.flickr.com/​photos/staxnet/ (external link)

https://photography-on-the.net/forum/showthre​ad.php?t=865770

  
  LOG IN TO REPLY
Replaces
Goldmember
Avatar
1,079 posts
Joined Aug 2009
Location: Illinois, USA
     
Nov 05, 2010 16:53 |  #6

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


"If you don't walk today, you have to run tomorrow."
Nikon, then Canon, then Nikon again. But I still love POTN over NikonCafe. :p

Nikon D90, MB-D80, Nikon D600, MB-D14, Nikkor AF-S 24-70mm f/2.8G, Nikkor AF-S 70-200mm f/2.8G VR.

  
  LOG IN TO REPLY
CountryBoy
"Tired of Goldmember label"
Avatar
5,168 posts
Joined May 2006
Location: Okie
     
Nov 05, 2010 16:58 |  #7

richardfox wrote in post #11232206 (external link)
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


Hi

  
  LOG IN TO REPLY
bohdank
Cream of the Crop
Avatar
14,060 posts
Likes: 6
Joined Jan 2008
Location: Montreal, Canada
     
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.


Bohdan - I may be, and probably am, completely wrong.
Gear List

Montreal Concert, Event and Portrait Photographer (external link)
Flickr (external link)

  
  LOG IN TO REPLY
gjl711
"spouting off stupid things"
Avatar
56,359 posts
Likes: 3020
Joined Aug 2006
Location: Deep in the heart of Texas
     
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?


Not sure why, but call me JJ.
I used to hate math but then I realised decimals have a point.
.
::Flickr:: (external link)
::Gear::

  
  LOG IN TO REPLY
CountryBoy
"Tired of Goldmember label"
Avatar
5,168 posts
Joined May 2006
Location: Okie
     
Nov 05, 2010 22:12 |  #10

bohdank wrote in post #11232568 (external link)
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.

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


Hi

  
  LOG IN TO REPLY
sangjiny
Senior Member
Avatar
760 posts
Joined Aug 2009
     
Nov 05, 2010 22:21 |  #11

CountryBoy wrote in post #11233721 (external link)
Very interesting :confused: . I'm very curious also .

+1 very curious.


Leica M9
Pentax 645D
Rolleiflex 2.8FX
Mamiya 7
Zeiss ZI Ikon

  
  LOG IN TO REPLY
Jam.radonc
Goldmember
Avatar
1,187 posts
Likes: 2
Joined Feb 2010
Location: Dublin
     
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?


Jam
5D3 | 450D | Panasonic DMC-LX3 | 430 EX II | ST-E2
24-70 L II | 50L | 50 1.8 I | 100L | Zeiss 35/2 ZE | Zeiss 85/2.8 | Zeiss 135/3.5
[COLOR="Silver"]Sold: 17-40L | 24L II | 85L II | 135L | Sigma 50/1.4 | 5D2

  
  LOG IN TO REPLY
yogestee
"my posts can be a little colourful"
Avatar
13,845 posts
Gallery: 5 photos
Likes: 37
Joined Dec 2007
Location: Australia
     
Nov 06, 2010 10:02 as a reply to  @ Jam.radonc's post |  #13

"Canon Rumors" :rolleyes:


Jurgen
50D~700D~EOS M~G11~S95~GoPro Hero4 Silver
http://www.pbase.com/j​urgentreue (external link)
The Title Fairy,, off with her head!!

  
  LOG IN TO REPLY
Logicus
Senior Member
Avatar
787 posts
Likes: 14
Joined Nov 2010
Location: Independence, KY
     
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...


My Gear List
My flickr (external link)
My flickr photos organized by Lens Used (external link)

  
  LOG IN TO REPLY
KenjiS
"Holy crap its long!"
Avatar
21,401 posts
Gallery: 582 photos
Likes: 2811
Joined Oct 2008
Location: Buffalo, NY
     
Nov 06, 2010 10:49 |  #15

Jam.radonc wrote in post #11234765 (external link)
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


Gear, New and Old! RAW Club Member
Wanted: 70-200. Time and good health
Deviantart (external link)
Flickr (This is where my good stuff is!) (external link)

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

17,428 views & 0 likes for this thread
Tamron Lens Phenomenon
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is Aphotographer21!
1006 guests, 226 members online
Simultaneous users record so far is 15144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.