Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

Started Mar 17, 2013 | Discussions
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robonrome
robonrome Senior Member • Posts: 1,899
Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

Hi All, I've had the 24-105L for four years and it's my most used lens. Recently it developed the dreaded aperture circuit problem which seems to bedevil this lens once it matures - froze on apertures above F4 and had to get ribbon cable inside replaced...not cheap either.

Hadn't used it much since, but playing around today I started to notice it no longer appears as sharp in the centre wide open... sure there was always a deterioration in sharpness in the corners, but now I'm seeing a drammatic increase in sharpness moving from f4 to f5.6 and again to f8 in the centre. I've always felt in the past the lens was very sharp in the centre even at F4 at least not appreciably softer than at F5.6.


Wondering now if some lens elements may have got misaligned when the aperture problem was fixed... or maybe I'm just noticing something that was always there...since getting the 70-200 2.8 mk2 I confess to have a new standard for sharpness so maybe it's just me.


What's the prevailing view on the 24-105 ...do others notice a big difference in sharpness from F4 to F5.6 esp at the long end?

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ASR45
ASR45 Forum Pro • Posts: 34,976
Re: Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

Cannot say i have, but there again not used it much, but will keep an eye open for that one thanks.  

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Gearóid Ó Laoi, Garry Lee
Gearóid Ó Laoi, Garry Lee Veteran Member • Posts: 6,060
Re: Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

I may have a very good version of the lens but I use it a lot.

This is one sample of lens at 58mm and F4. I don't hesistate to use this wide open doing the occasional wedding I do etc..

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rebel99 Veteran Member • Posts: 4,025
Re: Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?
1

24-105mm f4 was my first "L" lens which infected me with "L" disease about 6-7 years ago i have never had any problem with it whatsoever and my lens is as sharp and well functioning as the day one and it is one of my most used lenses in my collection, although it may be surpassed in usage by my 17-40mm f4 real soon!

cheerz.

gfspencer Contributing Member • Posts: 517
Re: Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

rebel99 wrote:

24-105mm f4 was my first "L" lens which infected me with "L" disease about 6-7 years ago i have never had any problem with it whatsoever and my lens is as sharp and well functioning as the day one and it is one of my most used lenses in my collection.

cheerz.

Same here.

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robonrome
robonrome OP Senior Member • Posts: 1,899
Re: Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

Hmm this is making me think that perhaps something did get nudged when the aperture circuit was repaired.

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Adza Regular Member • Posts: 333
How much did they charge?

Just curious as to how much they charged you for the repair?

sacentre Senior Member • Posts: 1,599
Re: Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

Exactly the same thing happened to me. The aperture assembly failed and was repaired by Canon and ever since then, I've had the feeling that the lens doesn't seem as sharp anymore. It's hard to pin down. I'm now looking back at my before and after shots to see if I can spot any real difference.  Could be just imagining it and will know once I do some more test shots.

robonrome wrote:

Hi All, I've had the 24-105L for four years and it's my most used lens. Recently it developed the dreaded aperture circuit problem which seems to bedevil this lens once it matures - froze on apertures above F4 and had to get ribbon cable inside replaced...not cheap either.

Hadn't used it much since, but playing around today I started to notice it no longer appears as sharp in the centre wide open... sure there was always a deterioration in sharpness in the corners, but now I'm seeing a drammatic increase in sharpness moving from f4 to f5.6 and again to f8 in the centre. I've always felt in the past the lens was very sharp in the centre even at F4 at least not appreciably softer than at F5.6.


Wondering now if some lens elements may have got misaligned when the aperture problem was fixed... or maybe I'm just noticing something that was always there...since getting the 70-200 2.8 mk2 I confess to have a new standard for sharpness so maybe it's just me.


What's the prevailing view on the 24-105 ...do others notice a big difference in sharpness from F4 to F5.6 esp at the long end?

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robonrome
robonrome OP Senior Member • Posts: 1,899
Re: Anyone else notice a major jump in centre sharpness f4 to f5.6 on the 24-105L?

Exactly the same thing happened to me. The aperture assembly failed and was repaired by Canon and ever since then, I've had the feeling that the lens doesn't seem as sharp anymore. It's hard to pin down. I'm now looking back at my before and after shots to see if I can spot any real difference.  Could be just imagining it and will know once I do some more test shots.

robonrome wrote:

Hi All, I've had the 24-105L for four years and it's my most used lens. Recently it developed the dreaded aperture circuit problem which seems to bedevil this lens once it matures - froze on apertures above F4 and had to get ribbon cable inside replaced...not cheap either.

Hadn't used it much since, but playing around today I started to notice it no longer appears as sharp in the centre wide open... sure there was always a deterioration in sharpness in the corners, but now I'm seeing a drammatic increase in sharpness moving from f4 to f5.6 and again to f8 in the centre. I've always felt in the past the lens was very sharp in the centre even at F4 at least not appreciably softer than at F5.6.


Wondering now if some lens elements may have got misaligned when the aperture problem was fixed... or maybe I'm just noticing something that was always there...since getting the 70-200 2.8 mk2 I confess to have a new standard for sharpness so maybe it's just me.


What's the prevailing view on the 24-105 ...do others notice a big difference in sharpness from F4 to F5.6 esp at the long end?

Thanks let me know how u go. Mine still seems quite sharp at 5.6 and above, but f4 at longer focal lengths is a marked deterioration in sharpness.

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robonrome
robonrome OP Senior Member • Posts: 1,899
Re: How much did they charge?

Just curious as to how much they charged you for the repair?

I think it was $320au. .. about $300US

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