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Author Topic: Lens focus tracking data  (Read 1215 times)

CanineCandidsByL

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Lens focus tracking data
« on: April 13, 2012, 11:11:51 AM »
Does anyone know if there is a site that looks at focus tracking in lenses in a measured way instead of just "its fast/slow" or "one 1 in 5 shots has usable focus"?

I'm hoping someone is alternating between targets at different distances and recording change time.  Maybe also using something that moves a target in a repeatable way while firing off photo to see how on/off focus they are?


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Lens focus tracking data
« on: April 13, 2012, 11:11:51 AM »

prestonpalmer

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Re: Lens focus tracking data
« Reply #1 on: April 14, 2012, 05:20:05 AM »
Great question.  Id love to see a test like that.  The problem is trying to compare apples to apples.

briansquibb

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Re: Lens focus tracking data
« Reply #2 on: April 14, 2012, 06:23:26 AM »
I would love to see that combined with AF times too. I keep seeing remarks about how much faster the 5DIII AF is over the 1D4 - to me the 1D4 is nearly instant so I would love to see some absolute figures

I have also seen comments about how much slower the 5DIII AF is when using automation selection due to the extra points being scanned.

Quite frankly I dont believe either is significant - I would expect no more than a couple of ms either way but it would be nice to know

Viggo

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Re: Lens focus tracking data
« Reply #3 on: April 14, 2012, 08:03:20 AM »
A couple of ms is all it takes at f1,2.

I use a lot of the widest apertures available and what surprises me is the difference between the 50 L and the 85 L, while the 85 is obviously slowe, I have more keepers with and my son running due it's insanely good accuracy.

So, yeah, I hope to see what the OP is asking to!
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briansquibb

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Re: Lens focus tracking data
« Reply #4 on: April 14, 2012, 08:08:59 AM »
A couple of ms is all it takes at f1,2.


Do you mean mm?

Viggo

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Re: Lens focus tracking data
« Reply #5 on: April 14, 2012, 08:14:07 AM »
A couple of ms is all it takes at f1,2.


Do you mean mm?

ah, yes...thanks! but maybe also millisceonds of hesitation of the AF I guess.
1dx, 24-70 L II, 50 Art, 200 f2.0 L

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Re: Lens focus tracking data
« Reply #6 on: April 14, 2012, 08:21:00 AM »
I think part of the reason no one has done it yet is it will be a major pain to setup something that is controlled and repeatable.
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Re: Lens focus tracking data
« Reply #6 on: April 14, 2012, 08:21:00 AM »

Aglet

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Re: Lens focus tracking data
« Reply #7 on: April 14, 2012, 11:09:09 AM »
Anyone got a big clean basement, with a large scale race-car track and great lighting?
That's be a somewhat repeatable hardware setup to start with for closer distances.
Otherwise gotta go outside and shoot traffic. :)

Viggo

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Re: Lens focus tracking data
« Reply #8 on: April 15, 2012, 03:11:58 PM »
One could shoot the mechanical rabbit dogs chase at a dog-race?
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Re: Lens focus tracking data
« Reply #8 on: April 15, 2012, 03:11:58 PM »