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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Jan 2011 (Tuesday) 03:47
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Question about sending lenses to canon for calibration and cleaning.

 
ching
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Feb 08, 2011 13:25 |  #16

If both of my 24-105 and 7D is under warranty. Do I need to pay for calibration?
I'm planning to calibration both of them so they mate each other

I heard NJ center is good


Nikon D800

  
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S.Horton
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Feb 08, 2011 20:43 |  #17

ching wrote in post #11802506 (external link)
If both of my 24-105 and 7D is under warranty. Do I need to pay for calibration?
I'm planning to calibration both of them so they mate each other

I heard NJ center is good

If you mean you want them set up on a particular body, yes, they will charge you but be very sure you know why you are doing that.

http://www.lensrentals​.com …s-is-soft-and-other-myths (external link)


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Skaperen
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Feb 10, 2011 20:17 |  #18

S.Horton wrote in post #11805362 (external link)
If you mean you want them set up on a particular body, yes, they will charge you but be very sure you know why you are doing that.

http://www.lensrentals​.com …s-is-soft-and-other-myths (external link)

That re-raises the questions I have about front/back focusing. How does this happen? I was thinking the common cause is the focusing screen where the AF function presumably happens is not exactly at the same distance from the lens (via the mirror) as the sensor/film actually is. Correct that so they are the same, and what is focused on the screen is focused on the sensor/film.

If I focus on the sensor in live view with magnification, shouldn't that be the ultimate focus, to the extent that I can see the detail in that view?

But what of cases where one lens is great, but another back focuses. Is this more a case of mechanical play in the lens mechanism, as opposed to optical configuration alignment? Or can the optical alignment really make one lens do this and not another? I can certainly see where optical alignment can make CA worse, or change its flatness of field, etc.


7D, 450D, 18-135/3.5-5.6, 18-55/3.5-5.6, 60/2.8 macro
Wish List: 5DsR, 16-35/2.8L,100/2.8L macro, 135/2L, LC-E6E

  
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KaBlookie
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Feb 11, 2011 07:42 |  #19

aroundlsu wrote in post #11802019 (external link)
Join Canon Professional Services for $100 and get two cleanings on any two items for free. Also free return shipping and a discount on any repairs. I used my free coupon last month and was shocked how fast they had my 1Ds back to me (just a few days).

That's a lot easier said than done...OP doesn't meet the requirements for any of the CPS memberships. I've thought about it too as I'd like to send in my 70-200, but I don't meet the requirements either.


7D - XTi - Tamron 17-50mm f/2.8 - Canon 50mm f/1.8II - SMC Takumar 50mm f/1.4 - Canon 70-200mm f/2.8L - Lensbaby 2.0 - Canon 430EX-II - CBS flash trigger

  
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anthony11
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Feb 11, 2011 10:54 |  #20

Skaperen wrote in post #11819190 (external link)
That re-raises the questions I have about front/back focusing. How does this happen? I was thinking the common cause is the focusing screen where the AF function presumably happens is not exactly at the same distance from the lens (via the mirror) as the sensor/film actually is.

My understanding is that the focusing screen is mainly for manual focusing and that the light path for AF sensors is split off.

If I focus on the sensor in live view with magnification, shouldn't that be the ultimate focus, to the extent that I can see the detail in that view?

Some people swear by that, but it seems to me to be practical only for static subjects, and when I've tried the force needed to engage the LV button has shaked the camera quite a bit. YMMV.

Join Canon Professional Services for $100

That'd be $100 plus the cost of buying the second body needed to qualify.


5D2, 24-105L, 85mm f/1.8, MP960, HG21, crumbling G6+R72, Brownian toddler

  
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Question about sending lenses to canon for calibration and cleaning.
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