Canon 24-105 Lens Test - Sample Photos

Started Dec 16, 2012 | Discussions
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Ben Jamin C Junior Member • Posts: 26
Canon 24-105 Lens Test - Sample Photos

I have the Canon 24-105 f4 which came with my 6D kit.  I am trying to determine if the copy I have is a "good copy" as it seems there are some that better than others from what I've read from others.  The two photos below were shot wide open at f4, one at 24mm and the other at 105mm.

There is definitely some softness, especially in the 105mm shot's far corners, less so in the 24mm shot it seems.  I know some of this is expected (in a zoom, in this lens), but wanted to see if the results are in line with the expected quality or if it needs some work.

If there's something else I should do to better test the lens and repost different examples let me know and I can do that as well.

I would love to have any thoughts on how the lens is performing - even at the good/bad/expected level.  Thanks!!

Canon EOS 6D
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speterson Forum Member • Posts: 57
Re: Canon 24-105 Lens Test - Sample Photos

Seems like a simple process - that of testing the quality of a lens - but there enters a complex of variables that can complicate the process. First of all the interface between your target and the camera. They should be exactly parallel to one another. If the target or camera does not register precisely laterally or vertically then you will not get an accurate report (especially at the pixel peeping level). Secondly, would be your shutter speed. If it is too slow then that could issue movement/blur (although it would be constent throughout). Still it would be advisable to do mirror-up exposures.

Best general advise - take numerous exposures of different targets at different apertures. Best specific advise - get Lens Align or Focus Tune for more satisfying/accurate results.

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Steve Peterson

rndman Senior Member • Posts: 1,595
Re: Canon 24-105 Lens Test - Sample Photos
2

Just take normal  pictures instead of "finding" the problems.

If the normal photos are satisfactory, just enjoy them by taking more and more.

These tests and the frustrations are never ending..

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BRUCEK56 Contributing Member • Posts: 858
Re: Canon 24-105 Lens Test - Sample Photos

Hi,

..................................both shots exif indicate they were shot at F8 not F4..............that is a HUGE difference.

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BRUCEK56

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Ben Jamin C OP Junior Member • Posts: 26
Re: Canon 24-105 Lens Test - Sample Photos

BRUCEK56 wrote:

Hi,

..................................both shots exif indicate they were shot at F8 not F4..............that is a HUGE difference.

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BRUCEK56

Oops, yes you're correct...it was f8.  My mistake.  Better to test at f8 (sharper) to test the lens build?  Or should I do an f4 example also?  Any thoughts?

AOKH
AOKH Senior Member • Posts: 2,675
Re: Canon 24-105 Lens Test - Sample Photos

Ben Jamin C wrote:

BRUCEK56 wrote:

Hi,

..................................both shots exif indicate they were shot at F8 not F4..............that is a HUGE difference.

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BRUCEK56

Oops, yes you're correct...it was f8. My mistake. Better to test at f8 (sharper) to test the lens build? Or should I do an f4 example also? Any thoughts?

Personally, I'd follow rdman's advise. All lenses exhibit some flaws and if it performs well under normal shooting, why get into what can quickly become an exercise of aggravation? However, if you are going to go through with it, better to do it wide open (as flaws are more obvious using max apertures).

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Regards. Anders

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BRUCEK56 Contributing Member • Posts: 858
Re: Canon 24-105 Lens Test - Sample Photos

Hi,

Definitely test it wide open first. Be sure to check the corners that even if they are a little soft at F4 which is normal that it is somewhat uniform around the frame and does not extend too far into the picture frame.

I just went through HUGE problems with my 24-105 lens that I sent to Canon to get refurbished. It was 7 years old and needed to be refreshed.

I paid 408.00 and it came back in as new condition. However after testing it it was very sharp in the center but extremely soft in the corners that extended far into the frame.

To make a long story short I ended up sending it back a total of four times (twice with my 1DX body).

After getting special handling and a supervisor and their best lens technician at their Virginia facility it was determined they could not repair the lens. They ended up shipping me a new lens (actually a late model refurb).

The new lens was completely different than my original returned lens. It was up to factory specs and I am very pleased with it.

While it is true you need to go out and take "normal' pictures to see how it behaves I do believe the newspaper test is important.

My defective lens was extremely sharp in the center even at F4 but horrendous in the corners that extended too far into the frame. I do mostly portrait type work so it took me awhile to see the problem with the corners.

I only first noticed it with group shots where the the left and right people on the sides were very blurry and it finally took me to the newspaper test to figure out precisely what the problem was. I sent 100% crops of these examples to Canon each time I sent the camera in but they still couldn't fix it.

I will always do the newspaper test now before testing any new lens in the field just so I have a baseline understanding of how the lens is supposed to perform.

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BRUCEK56

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billythek Veteran Member • Posts: 5,260
Re: Canon 24-105 Lens Test - Sample Photos

It looks about normal to me for the 24-105.  The CA looks familiar, too.

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- Bill

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Miguel Rodríguez New Member • Posts: 20
Re: Canon 24-105 Lens Test - Sample Photos

Looks very similar to mine. Not a great lens, just an ok lens for walkaround.

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