topic Re: T8i strange glow on pics in EOS DSLR & Mirrorless Cameras

T8i strange glow on pics

msnivens — Thu, 28 Jan 2021 15:05:11 GMT

I'm having a strange green/purple glow on my pictures sometimes with my brand new T8i. I happens on one of them, but not the other one, so I'm thinking something may be wrong with the one that keeps doing it. It seems to only do it on wide angle photos. When I zoom in, it doesn't have the glow. Is this something anyone has heard of? Is it a setting I can fix? Any suggestions??

Re: T8i strange glow on pics

msnivens — Thu, 28 Jan 2021 15:05:54 GMT

I have used a Canon lens and a Tamron lens and it happens with both of them.

Re: T8i strange glow on pics

rs-eos — Thu, 28 Jan 2021 16:31:03 GMT

Looks to be chromatic aberation. Which is worse when a lens is wide open. What specific lens are you using?

CA occurs in areas of high contrast (e.g. the edges of those lights). But also where dark areas transition to light areas.

Re: T8i strange glow on pics

kvbarkley — Thu, 28 Jan 2021 16:46:55 GMT

It could also be a weird flicker with the lights. Are you getting a flicker warning?

Re: T8i strange glow on pics

msnivens — Thu, 28 Jan 2021 18:03:23 GMT

no flicker warning...no warnings at all, shoots like normal when it happens and you don't know it's happening until you look at the preview.

Re: T8i strange glow on pics

msnivens — Thu, 28 Jan 2021 18:06:39 GMT

I have used 2 lenses with that camera and had the same problem both times, definitely in the wider angles.

a Tamron 16-300mm F/3.5-6.3

and

a Canon zoom lens EF 70-200mm 1:2.8 L IS II USM

Re: T8i strange glow on pics

rs-eos — Thu, 28 Jan 2021 18:16:58 GMT

I'm assuming the image above is with the Tamron at 16mm? That may just be how that lens is. I'm surprised though if the Canon 70-200 is doing the same for you.

I can get a lot of CA with my Canon 50mm f/1.2 L, but only really when at f/1.2. It decreases with narrower apertures.

If you can, try closing the aperature and then increasing say ISO. That will add more noise, but see if that helps reduce the CA issues.

Re: T8i strange glow on pics

msnivens — Thu, 28 Jan 2021 18:44:16 GMT

I've used both lenses with my T3i and T3's and I have never had this happen before, and it doesn't happen on my other T8i, just the one.

Re: T8i strange glow on pics

rs-eos — Thu, 28 Jan 2021 21:11:28 GMT

I honestly don't know, but it does sound like an issue with your one T8i. Do you have reduce chromatic aberation turned on for one T8i, but not the other? Beyond any camera settings, I guess contact Canon as it could be some hardware issue.

Re: T8i strange glow on pics

msnivens — Thu, 28 Jan 2021 21:15:37 GMT

I don't know. I haven't turned anything on or off on either of them, but I'll look into that setting for sure. Thanks so much for your help!

Re: T8i strange glow on pics

stevet1 — Thu, 28 Jan 2021 22:17:17 GMT

Is your digital lens optimizer turned on in the camera you are having trouble with?

Re: T8i strange glow on pics

ebiggs1 — Sat, 30 Jan 2021 15:38:40 GMT

Before trouble shooting, you need to reset everything to factor default. The Canon zoom is not subject to high CA but the Tamron has tons of it.

First go to your menu, tools, clear all settings and clear all custom settings. If the problem persists with the Canon lens, you have a problem with the camera. Send it to Canon for a C&C. 1 (800) 652-2666

Re: T8i strange glow on pics

stevet1 — Sat, 30 Jan 2021 16:53:50 GMT

You might also want to read up about Anti-Flicker Shooting, beginning on page 321 of your manual.

Steve Thomas

Re: T8i strange glow on pics

stratus41298 — Tue, 09 Nov 2021 22:35:04 GMT

I'm having the same exact issue. My two canon lenses don't have this issue at all. I have two T8i's in front of me and it's happening to both. One is used and one is new. I tried cleaning the contacts just to be sure. The funny thing is that on my T7 I have zero issues. Anti Flicker is off. I also noticed that on live view I can only do manual focus, but it keeps flickering like it's trying to go to auto.

Update: Okay so I played around some more and I found that if I unscrew the lens a millimeter or two counter clockwise the issue doesn't happen anymore but I still can't get auto focus in live view though which is really weird. Clearly there's an issue with the contact points lining up on a T8i, though I don't know of any stated difference between the two.

Update again: Doing MORE digging it turns out there's a firmware update to address this exact issue, though it mentions the T6i, not the T8i. I'm sure it's the same thing though. I will call Tamron and see what they have to say.

FIX: Okay not so much a fix as a work around, but in the camera settings, camera tab, menu 1, go to "lens aberration correction" and turn off the optimizer. Once you do that, new options show up and turn off "chromatic aberration correction". That fixes it. I still have to do MF on live view, but that's good enough for me. If i'm doing live view I have time anyways. PHEW. Please see relevant link:

https://www.dpreview.com/forums/thread/4273673