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Occasional Contributor
Posts: 7
Registered: ‎09-13-2020

Canon 50mm 1.2L HELP!!!

I was SUPER excited to upgrade in the 50mm department.  I got the Canon 50mm 1.2 L series just last week.  I ordered it brand new from Adorama.  I put it on my 5D Mark iii and tested it around the yard (with my chickens).  LOVED the quality!  I brought it out in the field with me to shoot an intimate wedding ceremony (20 guests).  It worked fine for the first 1200 or so shots.  Now every 5-6th image looks highly overexposed.  But the settings are exactly the same as the other images!  NO flash being used.  I haven't EVER experienced this with any of my other lenses (I have a lot).  Any advice?

ISO 1600  F2.8  1/320sec
_H2A7613.jpg_H2A7614.jpg

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Reputable Contributor
Posts: 977
Registered: ‎11-14-2012

Re: Canon 50mm 1.2L HELP!!!

[ Edited ]

May be sticky  blades. If that is the case the aperture will not close down to f/2.8 even if the camera reports it in Exif. My Fujifilm X100 had sticky aperture. Always f/2.


A way to check is to compare the depth of field between the pictures. If the depth of field changes it means the aperture isn't f/2.8.

DCS 3c, DCS 520, D30, D60, 1Ds, 300D, 30D, 1000D IR, 7D, 6D, 6D, M5
15-45/3.5-6.3 IS, 16-35/4 IS, 22/2, 24/1.4 II, 24-105/4 IS, 50/1.4, 85/1.8, 100/2.8, 70-200/2.8 IS II, 300/2.8 IS
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Honored Contributor
Posts: 6,925
Registered: ‎11-13-2012

Re: Canon 50mm 1.2L HELP!!!

Return it for a new one.

John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, MX472, LR Classic
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VIP
Posts: 13,026
Registered: ‎12-07-2012

Re: Canon 50mm 1.2L HELP!!!

Hold on there partner!  Returning it won't fix a thing if it isn't the lens. It isn't common but certainly not impossible for a camera to miss exposure. I have had it happen and there is nothing wrong with the lens. Before you return it and get the same thing with a different lens, you need to try it on several other, different, cameras. A call to Canon support (1 (800) 652-2666) is also a better choice than returning without some testing. Do the testing first and make the call. You have plenty of time.

EOS 1DX and 1D Mk IV and several lenses!
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Honored Contributor
Posts: 6,925
Registered: ‎11-13-2012

Re: Canon 50mm 1.2L HELP!!!

To me this sounds like more than a random missed exposure by the camera:  "It worked fine for the first 1200 or so shots.  Now every 5-6th image looks highly overexposed.  But the settings are exactly the same as the other images!"

 

Also sounds like she is 2+ weeks into the Adorama 30 day return window.

John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, MX472, LR Classic
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Esteemed Contributor
Posts: 4,186
Registered: ‎02-17-2016

Re: Canon 50mm 1.2L HELP!!!

Simple enough, were the exposure settings for the overexposed shots the same as for the well exposed shots?

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Occasional Contributor
Posts: 7
Registered: ‎09-13-2020

Re: Canon 50mm 1.2L HELP!!!

Thank you Peter!  It does appear as if the background is blurred a bit more in the highly overexposed frame... which would definitely lead me to believe sticky blades could be the issue and it's shooting a stop or more wider.

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Occasional Contributor
Posts: 7
Registered: ‎09-13-2020

Re: Canon 50mm 1.2L HELP!!!

Yes, it's sort of like if I have to send it in for service, I'm getting a refurbished lens... that should cost less, rather than a pristine NEW lens!

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Occasional Contributor
Posts: 7
Registered: ‎09-13-2020

Re: Canon 50mm 1.2L HELP!!!

I haven't had this camera miss exposure for over 6 years, with more than 6 lenses... it seems to me the culprit is most likely the difference/recent change, which is the week old lens.

I did a bunch of testing with multiple lenses this morning.  The only time it happens is with the new 50mm.

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Occasional Contributor
Posts: 7
Registered: ‎09-13-2020

Re: Canon 50mm 1.2L HELP!!!

Yes, I don't want to miss out on the window, so time is definitely of the essence and I'm not sure how it will go sending in to Canon.

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