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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 11 Mar 2014 (Tuesday) 14:37
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Shutter life: 7D vs 70D

 
Preeb
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Mar 14, 2014 09:52 as a reply to  @ post 16757862 |  #16

Frodge wrote in post #16756975 (external link)
It's not dooms day prophecy. It's a problem that exists on certain units. No, you may not get an affected body, bu you may. I admit it's a crapshoot. But I am not willing to take the chance. It's silly to not be forthright that a problem does exist. Not being able to nail focus at wide apertures at less than 15' is a big problem if you get an affected body.

Yes you do forecast doom and gloom in most of your posts. You seek out defects where none exist (60D peeling for example.. yours isn't). From what I see, the 70D is a great body, and for most uses has no issues. Most users haven't seen what that one thread seems to show, so I honestly don't know what is going on there.

I agree with the post above that leans toward possible issues in low light... gee, does any other camera have low light focus issues? And even then it only shows up with the lens wide open. Kick up the ISO (the 70D can handle it) and open the aperture another click... problem solved.


Rick
6D Mark II - EF 17-40 f4 L -- EF 100mm f2.8 L IS Macro -- EF 70-200 f4 L IS w/1.4 II TC

  
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MakisM1
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Mar 14, 2014 10:34 |  #17

Preeb wrote in post #16757978 (external link)
...
I agree with the post above that leans toward possible issues in low light... gee, does any other camera have low light focus issues? And even then it only shows up with the lens wide open. Kick up the ISO (the 70D can handle it) and open the aperture another click... problem solved.

It's a host of questions and possibly... issues...

The way I understand the 70D 'problem' is that,potentially, for a batch of cameras (I read Operating System version) the super-sensitive Center AF point, MAY have problems when it gets the lenses it becomes super-sensitive.

Again, my understanding, is that Canon has a loop in the AF logic that says:

a) OK what lens am I operating? f5.6 or faster

b) Ok AF.... Achieved.

c) Is the lens faster than f2.8?

d) Yes

e) Ok refine the AF... Achieved

f) Shoot

It sounds that potentially (it could be something else...) step (e) gets mucked-up... :rolleyes:

If you use a side point (not super- sensitive) it goes from (b) to (f) and produces better results.

Now if you pick a lens like the nifty and its antiquated AF motor, the test gets unfairly weighed by the keeper rate of the nifty.

It's reasonable for good light.

It's not as good in low(er) light. I have a good, sharp and accurate nifty. I do well in good light. I am attuned to how it focuses in low(er) light, so I get more keepers than average. However, 1 in 10, maybe 1 in 5, depending on the light is OOF. ...and I am NOT using a 70D... Don't test with the nifty... its AF (stepper motor) may not have enough 'step resolution' for accurate results/conclusions.

Lastly, kicking up the ISO/stopping down for the shot has nothing to do with the AF. The AF system uses the lens wide open and I am not sure, but the choice of ISO shouldn't play any role whether it AFs correctly or not.


Gerry
Canon 5D MkIII/Canon 60D/Canon EF-S 18-200/Canon EF 24-70L USM II/Canon EF 70-200L 2.8 USM II/Canon EF 50 f1.8 II/Σ 8-16/ 430 EXII
OS: Linux Ubuntu/PostProcessing: Darktable/Image Processing: GIMP

  
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Frodge
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Mar 14, 2014 11:01 |  #18

Preeb wrote in post #16757978 (external link)
Yes you do forecast doom and gloom in most of your posts. You seek out defects where none exist (60D peeling for example.. yours isn't). From what I see, the 70D is a great body, and for most uses has no issues. Most users haven't seen what that one thread seems to show, so I honestly don't know what is going on there.

I agree with the post above that leans toward possible issues in low light... gee, does any other camera have low light focus issues? And even then it only shows up with the lens wide open. Kick up the ISO (the 70D can handle it) and open the aperture another click... problem solved.

Let's talk about this post and not peeling grips. Clicking up the iso and the aperture on a lens that you pay extra for In order to have it be faster is a bandaid. Would to be happy if you intentionally bough fast glass and had to shut the lens down to accommodate the latest crop body? Maybe canon should stop charging people more for faster glass then.

From what I've read, this is not just the 50mm 1.8. It's anything under 2.4


_______________
“It's kind of fun to do the impossible.” - Walt Disney.
Equipment: Tokina 12-24mm, Canon 40mm 2.8, Tamron 17-50 2.8 XR Di, Canon 18-55mm, Canon 50mm 1.8, Tamron 70-300VC / T3I and 60D

  
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Shutter life: 7D vs 70D
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