topic Re: Canon 50mm 1.2L HELP!!! in EF & RF Lenses

Canon 50mm 1.2L HELP!!!

shesees — Mon, 14 Sep 2020 03:36:16 GMT

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

Re: Canon 50mm 1.2L HELP!!!

Peter — Mon, 14 Sep 2020 06:54:27 GMT

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.

Re: Canon 50mm 1.2L HELP!!!

jrhoffman75 — Mon, 14 Sep 2020 11:05:44 GMT

Return it for a new one.

Re: Canon 50mm 1.2L HELP!!!

ebiggs1 — Mon, 14 Sep 2020 14:33:18 GMT

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.

Re: Canon 50mm 1.2L HELP!!!

jrhoffman75 — Mon, 14 Sep 2020 15:56:09 GMT

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.

Re: Canon 50mm 1.2L HELP!!!

kvbarkley — Mon, 14 Sep 2020 15:57:18 GMT

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

Re: Canon 50mm 1.2L HELP!!!

shesees — Mon, 14 Sep 2020 16:20:29 GMT

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.

Re: Canon 50mm 1.2L HELP!!!

shesees — Mon, 14 Sep 2020 16:21:17 GMT

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!

Re: Canon 50mm 1.2L HELP!!!

shesees — Mon, 14 Sep 2020 16:23:15 GMT

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.

Re: Canon 50mm 1.2L HELP!!!

shesees — Mon, 14 Sep 2020 16:23:54 GMT

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.

Re: Canon 50mm 1.2L HELP!!!

shesees — Mon, 14 Sep 2020 16:24:32 GMT

settings are exatcly the same each and every time it happens.

Re: Canon 50mm 1.2L HELP!!!

Waddizzle — Mon, 14 Sep 2020 16:33:17 GMT

I'm surprised that no one has asked this, yet. What metering mode are you using for the two sample shots?

Re: Canon 50mm 1.2L HELP!!!

jrhoffman75 — Mon, 14 Sep 2020 16:39:29 GMT

OP stated settings are the same.

Re: Canon 50mm 1.2L HELP!!!

jrhoffman75 — Mon, 14 Sep 2020 16:41:16 GMT

You purchased from Adorama. Why not return to them?

Re: Canon 50mm 1.2L HELP!!!

Waddizzle — Mon, 14 Sep 2020 16:43:03 GMT

@jrhoffman75 wrote:
OP stated settings are the same.

....and the metering mode is?

Re: Canon 50mm 1.2L HELP!!!

ebiggs1 — Mon, 14 Sep 2020 17:16:55 GMT

"I haven't had this camera miss exposure for over 6 years, with more than 6 lenses..."

This proves nothing except you had good luck with your gear ....so far. It can fail on the very next shot.

"it seems to me the culprit is most likely the difference/recent change, which is the week old lens."

If you asign it to the lens and it is not the lens a new or different lens will not fix the problem. That is the issue here. Returning it is not your first option.

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

OK that is fine but you need to do the test it on a different or several different cameras.

Then if it becomes so that it is the lens at fault you need to call Canon support 1 (800) 652-2666. A lens sent to Canon will come back better than new as it will have a tech do a through fully functional diagnosis on it. Way more that the average off the line lens gets.

Re: Canon 50mm 1.2L HELP!!!

Stephen — Mon, 14 Sep 2020 17:20:49 GMT

Be nice, Ernie! 😀

Re: Canon 50mm 1.2L HELP!!!

ebiggs1 — Mon, 14 Sep 2020 20:02:13 GMT

??????????? Was that not nice? It is the correct advice. If it is not the lens at fault replacing it will not help!

Re: Canon 50mm 1.2L HELP!!!

Ray-uk — Tue, 15 Sep 2020 15:48:10 GMT

You don't have to keep making exposures to find out what the fault is.

Put the camera in manual mode, look into the lens from the front, hold down the DOF preview button, turn the dial slowly so that the lens steps through each aperture setting in turn. If the aperture is sticking you will soon be able to see it as it won't respond to each click of the dial as it should.

Re: Canon 50mm 1.2L HELP!!!

MikeSowsun — Tue, 15 Sep 2020 16:41:12 GMT

The EXIF data is available for both photos. The EXIF data is identical for both photos, and they were taken at the same time.

That means it doesn't matter what the metering mode was, or what shooting mode the camera was in. All it means is the lens is defective and it is most likely sticking aperture blades.