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Thread started 09 Apr 2013 (Tuesday) 09:16
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85mm 1.2L Auto-focussing Advice?

 
dancook
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Apr 09, 2013 09:16 |  #1

I have the 5D Mark II, I'd like to upgrade to the 5D Mark III this year.

How would people take photos using large apertures where the subject is moving, say a child for example.

How to keep getting focus on the eye?

I assume the central AF point is not ideal, you probably aren't going to have an eye dead bang in the centre of the image.

Do you pick an AF point (assuming not central) to work with? and only get compositions where that is on an eye. Or do you rely on "auto-point?"

I am expecting too much to try and hit focus on wide apertures on a move subject at reasonably close distances?




  
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bobbyz
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Apr 09, 2013 09:20 |  #2

Get 5dmk3.:)


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jacuff
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Apr 09, 2013 09:21 |  #3

You pre-focus to a set distance and when child moves into that target distance, you take the shot. The 85mm f/1.2L is a slow lens to use with AI Servo and expect the image to be in focus. An 85mm f/1.8 is a better choice, but still will be harder to nail at close range.


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bobbyz
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Apr 09, 2013 09:23 |  #4

jacuff wrote in post #15807525 (external link)
You pre-focus to a set distance and when child moves into that target distance, you take the shot. The 85mm f/1.2L is a slow lens to use with AI Servo and expect the image to be in focus. An 85mm f/1.8 is a better choice, but still will be harder to nail at close range.

At f1.2?


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dancook
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Apr 09, 2013 09:29 |  #5

jacuff wrote in post #15807525 (external link)
You pre-focus to a set distance and when child moves into that target distance, you take the shot. The 85mm f/1.2L is a slow lens to use with AI Servo and expect the image to be in focus. An 85mm f/1.8 is a better choice, but still will be harder to nail at close range.

So in manual mode with focus confirm?

Would you have it on auto-select focus point, and just try and get the eye in one of the squares, and snap as it goes red?

-- what would be nice is one of those Sony features, where it recognises the face and knows what to do !

oh and yes I look forward to some better AF with the 5dm3...

--oh I forgot to say it is the 85MM 1.2L II (not I)




  
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Charlie
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Apr 09, 2013 10:02 |  #6

either step back a few or stop down to get more DOF. If you have an inch or less DOF, you'll be missing tons regardless of body.

sounds like you're expecting too much IMO.


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dancook
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Apr 09, 2013 10:04 |  #7

Charlie wrote in post #15807673 (external link)
sounds like you're expecting too much IMO.

I figured this might be it :)

But yes as I do with macro, moving in and out sounds worth a try.




  
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cdang
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Apr 09, 2013 10:09 |  #8

I have enough trouble with still subjects with this lens. Yes I know people can do wonderful things with this lens, I saw someone posting motorsports shooting at F1.2, sadly I can't quite get it right yet.




  
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jacuff
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Apr 09, 2013 10:19 |  #9

bobbyz wrote in post #15807535 (external link)
At f1.2?

I am not sure I fully understand your question.


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Jam.radonc
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Apr 09, 2013 10:26 |  #10

One of the reason's I sold the 85L II was when I had to work with it with 5D2. I expect that with superior AF of 5D3 that lens will shine.

Problem of course is the narrow f1.2 DOF. It'll be difficult to nail it but when you do it is something no other lens can replicate. I do dearly miss that lens and may be thinking of getting it again in the future. It is rather slow to focus though on account of the mass of the glass the USM have to move.


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bobbyz
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Apr 09, 2013 10:36 |  #11

jacuff wrote in post #15807747 (external link)
I am not sure I fully understand your question.

You saying prefocus using f1.2, let the kid come in the zone and shoot.


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jacuff
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Apr 09, 2013 11:02 |  #12

bobbyz wrote in post #15807807 (external link)
You saying prefocus using f1.2, let the kid come in the zone and shoot.

Yes. Of course at f/1.2 and close distance, that zone is very small but that's the nature of the beast. The method would also work at smaller aperture values, but won't be as necessary.


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zerovision
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Apr 09, 2013 12:02 |  #13

Just remember at 1.2, if your trying to get the eye sharp at close range, then the nose will be out of focus, so trying to nail the shot while the subject is moving, wow. I suggest you try using AI Servo and the center focus point to get the eye sharp, then crop the shot to your liking.


  
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snake0ape
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Apr 10, 2013 02:00 |  #14

I have tried the 5diii with 85 at f1.2 with "kids in motion" this Easter. It is tough but my keeper with moving kids is about 50%. 90% with kids standing still.
I used ai servo. And move the focus point to the outer point so that when the camera is perpendicular to the kid, the focus point is at the kid's eye level. Aim at the kid with ai servo on, and when their eye crosses the focus point , snap the shot. If you get good with that, you can start using the joystick to move the focus point to get that right composition.


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kin2son
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Apr 10, 2013 02:10 |  #15
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I'd just use centre point and take lots of shots.

Also stand further back, frame loosely and crop later just to get few extra centimeters of dof.

Certainly a limitation/disadvantag​e of the 5D2 as we all know it.


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85mm 1.2L Auto-focussing Advice?
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