09-13-2020 11:36 PM
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
09-14-2020 02:04 AM - edited 09-14-2020 02:54 AM
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.
09-14-2020 10:33 AM
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.
09-14-2020 11:56 AM
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.
09-14-2020 12:20 PM
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.
09-14-2020 12:23 PM
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.