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FORUMS Photography Talk by Genre Sports Talk 
Thread started 24 Nov 2017 (Friday) 09:04
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Focus Question - Please Help

 
Pipernails
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Nov 24, 2017 09:04 |  #1

Hi,

I have attached one of my photos from yesterday's game and could use some advice so it doesn't happen again. In this photo, the middle is in focus, however, the edges are blurry. Considering the boys are all along the same plane, I can't figure out why this happened. I tried various f-stops (7.1, 9, 11) and they all had the same result. With the championship game next week, I don't want to repeat this problem. Here is the exif info for this particular image:

Canon 1DX Mark II
EF 24-105 f/4L IS USM
ISO 200 45mm f/9 1/500


Thank you!
Laura


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MalVeauX
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Nov 24, 2017 09:23 |  #2

You'll need to show crops of center, edges, etc, to really see it. At this scale, we can't see any difference.

Very best,


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Pipernails
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Nov 24, 2017 09:29 as a reply to  @ MalVeauX's post |  #3

Thank you for the feedback. Does this help?


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MalVeauX
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Post edited 7 months ago by MalVeauX.
     
Nov 24, 2017 09:57 |  #4

I see what you mean, that left side seems worse than the right.

I'm going to guess its just the lens. Even stopped down its present. It's not motion blur or shake at 1/500s at that focal length with stationary subjects. And it's only the edges (and really pronounced on that left side to me). So that looks like a lens imperfection to me.

That's not something you did.

Very best,


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nqjudo
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Nov 24, 2017 10:07 |  #5

Agreed with the above. Do some tests on flat, static subjects and look for softness in the same areas.


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Pigpen101
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Nov 24, 2017 10:07 as a reply to  @ MalVeauX's post |  #6

It sorta looks to me like you are standing off center, a little towards the right, putting yourself closer to the people on the right. That would put them on a different focal plane, but I'd think that being @ F/9 should cover it.




  
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MalVeauX
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Post edited 7 months ago by MalVeauX.
     
Nov 24, 2017 10:11 |  #7

Pigpen101 wrote in post #18503202 (external link)
That would put them on a different focal plane, but I'd think that being @ F/9 should cover it.

Yea, F9 at 45mm on full frame, shouldn't matter if someone was standing 2 feet behind them. 20 feet from the subject, 45mm F9 on full frame produces 91 feet of total depth of field approximately. The trees and building in the center are nearly in focus and just barely soft as they're probably over 100 feet away. That left side is a physical problem with the lens you can see weird stuff on the kid's arm, leg, etc and those trees are way different than the center trees).

Very best,


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PhotosGuy
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Nov 24, 2017 10:18 |  #8

Considering the boys are all along the same plane,

I agree that F/9 should cover it, but you should know that unless a lens is designed for a flat plane of focus (copy lenses), the plane of focus is actually curved.
And the grass at the bottom of the image looks sharper than the grass at their knees. Maybe you should run some focus tests.
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Focus Question - Please Help
FORUMS Photography Talk by Genre Sports Talk 
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