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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 13 Nov 2013 (Wednesday) 00:21
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My shots at 1.4 acceptable?

 
Ginga
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Nov 13, 2013 09:01 |  #16

Use static subjects for tests i.m.o.


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kipliq
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Nov 13, 2013 10:54 as a reply to  @ Ginga's post |  #17

Hi All, thanks on the input. the lens is a sigma and will be my low light and walk around. I'm mostly taking about the focus shifting that someone mentioned. This is my seconded copy but it seems to be better at focusing. I'll shoot in the specific conditions somsone mentioned and post my results. My idea was the I'm new to 1.4 so it could be me giving off the shifting focus? I like the build of the sigma more then the canon but if this lens keeps shifting after MA then I guess I'll return for the canon 35mm 1.4.


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gonzogolf
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Nov 13, 2013 10:59 |  #18

kipliq wrote in post #16448376 (external link)
Hi All, thanks on the input. the lens is a sigma and will be my low light and walk around. I'm mostly taking about the focus shifting that someone mentioned. This is my seconded copy but it seems to be better at focusing. I'll shoot in the specific conditions somsone mentioned and post my results. My idea was the I'm new to 1.4 so it could be me giving off the shifting focus? I like the build of the sigma more then the canon but if this lens keeps shifting after MA then I guess I'll return for the canon 35mm 1.4.

Test it on a more suitable subject. You want your test to be done in a controlled setting, even if thats not how you will be using it in the field. You want a subject with sufficient detail to tell whether you have enough sharpness and of sufficient size to ensure that you locked focus. Once you are certain the lens is working correctly, you can evaluate whether it performs to your wishes in the field.




  
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kipliq
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Nov 13, 2013 12:32 |  #19

gonzogolf wrote in post #16448391 (external link)
Test it on a more suitable subject. You want your test to be done in a controlled setting, even if thats not how you will be using it in the field. You want a subject with sufficient detail to tell whether you have enough sharpness and of sufficient size to ensure that you locked focus. Once you are certain the lens is working correctly, you can evaluate whether it performs to your wishes in the field.

I will test this today. Thank you everyone!


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vengence
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Nov 13, 2013 12:43 |  #20

Lens testing should always be done via a tripod and controlled lighting at low iso. Otherwise you are judging the body and not the lens. Any lens will look better on a t1i at iso 100, 1/2000s than a 7d with iso 25,600 and 1/20s because the second isn't testing the lens, it's testing the body.




  
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Nov 13, 2013 14:37 |  #21

kipliq wrote in post #16447442 (external link)
Yes Crops, in the middle of each picture

As others have said, try performing a more controlled test. And maybe try posting the full image next to the crops to offer some perspective. Also, you're last image looks good on the leaves to the upper left. My guess is the lens needs some adjustment because the other shots look a little out of focus.


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kipliq
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Nov 13, 2013 15:56 |  #22

dscri001 wrote in post #16448924 (external link)
As others have said, try performing a more controlled test. And maybe try posting the full image next to the crops to offer some perspective. Also, you're last image looks good on the leaves to the upper left. My guess is the lens needs some adjustment because the other shots look a little out of focus.

I stated about 3 hours ago that I would test and get back to everyone that is helping. Cheers :)


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kipliq
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Nov 13, 2013 21:45 |  #23

Hi everyone update my post with new pictures. I deleted the old pictures. No sharpening to the pictures.


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Sirrith
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Nov 13, 2013 23:52 |  #24

kipliq wrote in post #16450106 (external link)
Hi everyone update my post with new pictures. I deleted the old pictures. No sharpening to the pictures.

Looks perfectly fine to me!


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kin2son
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Nov 14, 2013 00:22 |  #25
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Sirrith wrote in post #16450367 (external link)
Looks perfectly fine to me!

I disagree. They all look soft and front focused.

Grass in front definitely look sharper.

This could still be down to user error thou.

OP try not to shoot it at an angle but head on, also make sure you use a single point (preferably center).


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kipliq
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Nov 14, 2013 01:31 |  #26

kin2son wrote in post #16450398 (external link)
I disagree. They all look soft and front focused.

Grass in front definitely look sharper.

This could still be down to user error thou.

OP try not to shoot it at an angle but head on, also make sure you use a single point (preferably center).

Will Test tomorrow same everything on a table and post. Get back to you all. Looks better after I sharpened the picture.

So do all lenses front/back focus different in different types of light? So if it is sharp in good lighting the lens is okay and it could be user error. I don't mind user error as I will get better over time I hope.


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Sirrith
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Nov 14, 2013 02:53 |  #27

kin2son wrote in post #16450398 (external link)
I disagree. They all look soft and front focused.

Grass in front definitely look sharper.

This could still be down to user error thou.

OP try not to shoot it at an angle but head on, also make sure you use a single point (preferably center).

I only looked at the size posted on this topic. Figured the grass was sharp as well because its at an angle.


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gonzogolf
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Nov 14, 2013 09:24 |  #28

It seems you missed the part of the advice about filling enough of the frame with a subject that contains detail.




  
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kipliq
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Nov 14, 2013 12:15 |  #29

gonzogolf wrote in post #16451033 (external link)
It seems you missed the part of the advice about filling enough of the frame with a subject that contains detail.

"Contains detail" Can you give me an example, as people had different level they prefer. Thanks!


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gonzogolf
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Nov 14, 2013 12:25 |  #30

kipliq wrote in post #16451421 (external link)
"Contains detail" Can you give me an example, as people had different level they prefer. Thanks!

Maybe something with some texture that would allow for you to evaluate sharpness, it can be anything a brick, a cardboard box, really doesnt matter. But the most important part here is getting it to fill a significant portion of the frame. To tell if your test shots are sharp one would have to zoom in fairly large on an already downsized image.




  
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My shots at 1.4 acceptable?
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