Canon EOS 7D Mark II AF Issues
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Vincwat said:
Muhahaha, thank you, double score :->
Concerning the matter at hand another obvious question: You did the shots 600d vs 70d with raw and similar develop settings, right? If you did proper comparison shots feel free to post some 100% crops of them, just with a general statement you're unlikely to get to the bottom of this.
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Vincwat said:
Ok, thanks.
Out of curiosity, did you try comparing shots focused with Live View? If the live view shots are sharper than VF, that suggests an AF problem. If they are similar and neither are as sharp as the 600D, that points to the camera or to processing. For your comparison with the 600D, were those OOC JPGs or RAW, and if the latter how were they converted?
Also, have you tried with another lens? 3rd party lens makers must reverse-engineer Canon's AF protocols, and the 7DII wasn't available when Sigma was designing the 150-600. It's possible there are issues with newer protocols in the 7DII (it's even possible those issues are intentional on Canon's part).
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I have some files, I need to ask the other photographer for his files. Then I will be able to post something.
I know that general statements are never good enough for some.
If the 7Dk2 cannot work well with the sigma, I don't know what to do. I am gonna give a try using my 70-200. Otherwise I will end up buying another 5Dmk3 or a 1Dx.
Vincwat
I know that general statements are never good enough for some.
If the 7Dk2 cannot work well with the sigma, I don't know what to do. I am gonna give a try using my 70-200. Otherwise I will end up buying another 5Dmk3 or a 1Dx.
Vincwat
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Vincwat said:
The af system of the 7d2 is rather on the complex side and a new design, so I imagine neither Sigma nor Canon have optimized or tested this combination... conspiracy theorists might even say Canon doesn't have much an interest to do so. Did you try to contact Sigma for a possible lens fw update which enhances this combination?
In any case, debugging with Canon's premium 70-200L should be able to tell you if the camera body is the problem, because *this* combination should really work.
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Vincwat said:
I haven't heard of any issues with that lens on the 7dii. There is an issue with live view on the new rebels. Sigma released a firmware update for.that.
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neuroanatomist said:
I agree with the latter, but concerning the former a manufacturer might, just might test a camera system with some 3rd party lenses that are used a lot by the targeted audience - for example the "birder" 7d2 with the usual suspect's tele zooms. Doing so would simply be a nice gesture as Canon is well aware that some people don't use original brand lens hoods or lens caps, even if they don't encourage such disloyal behavior :->
The conspiracy would be that Canon actively sabotages their system *not* to work with lenses that are bound to be used for a specific camera to boost their own sales - it's not like this never happened in the industry. But of course, we'll never know that.
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It seems canon tries its best to force you to buy "genuine canon batteries". I don't doubt they also do whatever they can to make 3rd party lenses disfunctional. Can't really blame them for it I guess.
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neuroanatomist said:
Point is that it's not really a guesture, but a business strategy - for me, the Canon system includes the possibility of using 3rd party products beyond lens caps and hoods. Canon agrees, after all they *could* lock out everything and make a camera with a 3rd party battery explode in your face.
But if you really could only use original brand lenses and not a cheaper tele zoom like the op's Sigma, they would lose a lot of sales to Sonikon. So I find it somewhat inconsistent that they play the "we don't know anybody named Sigma" game and not a bit more forthcoming with user service like an "unofficially official faq" concerning compatibility or potential issues. Same goes for the "ignore" strategy towards Magic Lantern, btw.
neuroanatomist said:I even suggested that very possibility.Marsu42 said:
You did? Oh my, that's minus one fanboi credit for you :->
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Just to add my contribution to this "conspiracy theory", Canon told me that it was normal that my Canon 17-55 lenses (2 lenses tested) are giving poor images (AFMA done) since they are not L lenses. The same 17-55 lenses that give perfect images with a 500D and a 600D...
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In the firmware of your 7D2, there is a table of lens data with the characteristics of the various lenses. One of the table values is acceleration/deceleration values, another is number of focus points, etc. What this allows is optimized focusing. Say that the AF system decides that the lens has to be moved 120 units to achieve focus..... the camera uses the acceleration data to determine how long to drive the AF motors to accelerate the lens group, and at the appropriate time, to stop accelerating the lens group and decelerate it to arrive at the focus point in the minimum amount of time and as a result, with a minimum of hunting for focus.Marsu42 said:
For some inexplicable reason
Canon creates and stores this data for their lenses and NOT for third party lenses....When the camera encounters a lens that is not in the table, it does not know how many AF units to move it nor does it know how fast it moves...... so the camera makes a guess, moves it, checks AF, and tries again. This is why third party lenses are slower and hunt more than Canon lenses.
There is a cheat..... the third party manufacturer could find the Canon lens with the AF performance that is closest to their lens and when the camera queries the body, to tell the camera that it is that "close" camera lens.... the problem with that is that now the camera is using wrong data for the lens and in reality, this configuration behaves worse than the algorithm for an undefined lens, so nobody does this.
and this is why Canon bodies focus best with Canon lenses, and similarly why a Nikon body will focus best with Nikon lenses, and why a Sony body will focus best with Sony lenses
(as told by a Tamron rep)
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Sent my 7dm2 for Canon. The support guy was very polite and wrote down all my complaints, the camera body will be sent to technicians for evaluation and replacement of faulty parts.
I hope the technicians have dealt with this before and know what to replace. My bet is on sensor shake, making every image seem a little bit out of focus and/or blurry.
I hope the technicians have dealt with this before and know what to replace. My bet is on sensor shake, making every image seem a little bit out of focus and/or blurry.
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I have tried to provoke some AF malfunctioning out of the 7DII and I cannot say I have been very successful. The only negative thing, which is the case with all crop cameras, is the extra noise, when you move up in ISO. But in general, this camera delivers what I had expected.
I have some interesting birds in the Oslo fjord these days, but they have been quite far out. So I decided to AFMA the 600mm f4L IS II + 2xIII combo. And of course, the only available model was The Local Lion (I´m sure many of you have missed him)
This was focused on his eye, 1/1250s, f8.0, ISO2500 (and by the way, it is a 100% crop)
I have some interesting birds in the Oslo fjord these days, but they have been quite far out. So I decided to AFMA the 600mm f4L IS II + 2xIII combo. And of course, the only available model was The Local Lion (I´m sure many of you have missed him
)This was focused on his eye, 1/1250s, f8.0, ISO2500 (and by the way, it is a 100% crop)
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Just make one more experiment with the 500:daniela said:
Semicorrect by focusing manually (with the lens left to AF) then try again.
I use 2 5D3s. There are some cases that my 500 4 II cannot do anything if it is way off.
I am not sure if this is the case however, since I overcame this when as a TEST I instructed my camera's "Lens Drive when AF impossoble" to ON contrary to all pro (and so called pro) suggestions to set it to OFF.
Since then, I have set it back to OFF and in the rare case when this happens I half-correct manually and let the lens do the rest.
You mentioned that the lens kept hanging so that setting had to be already ON. In that case I have no suggestions I am afraid.
By the way I am in a similar (but inverted) situation with you. I do have 500mm f/4L IS II and I am thinking of getting 7DMkII !
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Eldar thanks for the info. A few questions if you please:Eldar said:I have tried to provoke some AF malfunctioning out of the 7DII and I cannot say I have been very successful. The only negative thing, which is the case with all crop cameras, is the extra noise, when you move up in ISO. But in general, this camera delivers what I had expected.
I have some interesting birds in the Oslo fjord these days, but they have been quite far out. So I decided to AFMA the 600mm f4L IS II + 2xIII combo. And of course, the only available model was The Local Lion (I´m sure many of you have missed him
This was focused on his eye, 1/1250s, f8.0, ISO2500 (and by the way, it is a 100% crop)
Is this result repeatable?
Have you tried something similar with other lenses for example 100-400 or similar?
ISO2500 seems clean. Have you denoised the image or you just exposed correctly?
Thanks.
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