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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Sep 2017 (Friday) 11:15
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85 1.8 Focus issue

 
CheshireCat
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Post edited 9 months ago by CheshireCat. (2 edits in all)
     
Sep 30, 2017 18:15 |  #16

amfoto1 wrote in post #18463587 (external link)
That's B.S. In fact, for many purposes it's superior to the far more expensive 85/1.2L II. The "old" f/1.8 is much faster focusing and a better choice for any sort of sports/action shooting. It's also a lot smaller and less intrusive.

I never said the 85/1.2 has faster focus, and yes, it is also an old lens.
About the “many purposes” you are talking about, they are only AF speed and portability. For everything else, the 85/1.8 is an obsolete 25-year old lens.
This does not mean that you can’t take awesome photos with it.
Canon delayed the release of a modern 85mm lens until Sigma came out with its 85 Art. That is the real sad part of the story.

Back to the subject, the problem with AI Servo is that the camera predicts the movement of the subject, and the lens must be able to precisely focus where the camera tells it to go in realtime.
Apart from speed, the precision and accuracy of the lens AF motor is critical for AI Servo to correctly track the subject in realtime.
In single shot, there is no such problem, as the AF closed-loop can correct for lens motor errors, and has all the time it needs to converge to focus.

In any case, I’d send the lens to Canon to be checked.


1Dx, 5D2 and some lenses

  
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wallstreetoneil
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Sep 30, 2017 18:34 |  #17

amfoto1 wrote in post #18463587 (external link)
I have no idea why anyone would "avoid using AI Servo with non-IS lenses". I've never even given it a thought before and use it with both. Focusing and images stabilization are two different systems that don't have very much interaction. And in fact, after using various IS lenses for over 15 years, if anything I think Canon IS "helps" the camera & lens focus more quickly (regardless of mode), by stabilizing the target that the AF system is trying to lock onto. But all that's neither here nor there with non-IS lenses.... I see no reason not to use AI Servo with them, too. Works fine!

Most of my AI Servo experience, IS lens preference, comes from my experience of trying to get repeated sharp images with the 50 megapixel 5DSR. Your comments about IS helping is actually making my point for me - and what I learned after months and months of testing trying to find the best working lenses for the 5DSR - and realizing how important a stable platform is - and why, paradoxically, AI Servo, with its repeated firing of the AF mechanism, hurts the stability platform - and why that is extremely detrimental when using a high megapixel camera and trying to extract the maximum resolution.

I don't in anyway believe that my comments above are relevant to this thread - but I have answered them, for you, to tell you why I never, ever, will use AI Servo, with a 5DSR, while handholding, unless the lens has IS - but more importantly, I don't use any lens, on the 5DSR, that doesn't have IS - I in fact sold the 35L, 50L, 85L II and 135L because after months of testing, every way to Sunday, I determined, and have enormous amounts of data to prove it, that you need 1/6x FL to get tack sharp images on the 5DSR when lenses do not have IS - and that AI Servo makes the problem worse, not better, than Single Shot. As an aside, I have replaced all the above lenses with the Tamron 45 & 85 1.8 VC and I'm waiting for the Canon 135L IS to be released - and can tell you that there is no comparison for handheld sharpness. In comparison, for my 20 megapixel 1DXii, I use the 24-70 F2.8 II, and the Canon 35Lii F1.4 and the images produced are tack sharp for 20 megapixels - but basically useless when trying to extract 50 megapixels of detail - thus I am waiting for delivery of my Tamron 24-70 F2.8 VC.


Hockey and wedding photographer. Favourite camera / lens combos: a 1DX II with a Tamron 45 1.8 VC, an A7Rii with a Canon 24-70F2.8L II, and a 5DSR with a Tamron 85 1.8 VC. Every lens I own I strongly recommend [Canon (35Lii, 100L Macro, 24-70F2.8ii, 70-200F2.8ii, 100-400Lii), Tamron (45 1.8, 85 1.8), Sigma 24-105]. If there are better lenses out there let me know because I haven't found them.

  
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huntersdad
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Sep 30, 2017 22:32 |  #18

Thanks everyone for their input. After 13 years of shooting and having shot a lot of higher end glass, I can say, with relative confidence, it's not a technique problem. I can't explain it either as this is the first lens I've ever had where I get this type of OOF completely soft image, but only when using the VF.

I'll do some more testing tomorrow and see if anything new comes out and, if so, I'll post some samples.


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5D4 / 35 F2 / 50L / 85 1.8

  
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85 1.8 Focus issue
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