90d: Photos over exposed (double iso) when shooting in non live view mode

[vizualequalizer]

I have a Canon eos 90d and the photos are over exposed when shooting in non live view mode (when switching back-and-forth between live view and viewfinder modes; the ISO doubles), or another words looking through the viewfinder, the ISO will double. There's no exposure addition or subtraction on exposure stops. I am confused please help!

[ebiggs1]

"Whenever you think the camera is acting strange you should reset the camera to factory settings."

This is where and what you needed to do from the start.  You have set something either on purpose or accidentally wrong. You need a total reset of the 90D.  Menus, tools, clear all settings and also clear all custom settings. Trying to troubleshoot something when you don't know if you are starting from ground zero is a fools errand.

So, reset the 90D.  Set it to P mode, fix ISO to 200. Use just the center focus point and One shot. WB set to daylight. Now go outside on a sunny day a take several general shots.  Make sure you have some vertical lines in some of them. Like trees, a fence or buildings, etc.  It the 90D makes the great photos it is capable of the camera is working correctly.  This means you set something incorrectly for the photos in question.

Keep in mind how you meter something can drastically affect the outcome.  Spot metering is vastly different than evaluative for instance.

[Waddizzle]

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@ebiggs1 wrote:

"Whenever you think the camera is acting strange you should reset the camera to factory settings."

This is where and what you needed to do from the start. 

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 The camera has already been reset and cleared.  No change.  Same behavior.  Using Evaluative Metering, too.

[stevet1]

I've long had the same frustration. When using auto ISO, I think my pictures are coming out too light.

Here's two picture taken seconds apart. I'm using aperture priority - F8 in both.

In the first, the exposure meter is reading 0 - right in the middle. The camera has set a shutter speed of 1/320 and an ISO of 1000.

For the second pictrue, I dropped the expossure compensation by 1/3 of a stop. The camera dropped the shutter speed to 1/250 and set the ISO to 640.

I think the first picture is too light, or overexposed, or whatever.

These were taken handlheld using the OVF in both.

Steve Thomas

[Waddizzle]

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@stevet1 wrote:

I've long had the same frustration. When using auto ISO, I think my pictures are coming out too light.

Here's two picture taken seconds apart. I'm using aperture priority - F8 in both.

In the first, the exposure meter is reading 0 - right in the middle. The camera has set a shutter speed of 1/320 and an ISO of 1000.

For the second pictrue, I dropped the expossure compensation by 1/3 of a stop. The camera dropped the shutter speed to 1/250 and set the ISO to 640.

I think the first picture is too light, or overexposed, or whatever.

These were taken handlheld using the OVF in both.

Steve Thomas

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Do not use ISO Auto in Tv or Av modes.  Always dial in an ISO when using those modes.  Never let the camera control more than none leg of the Expousre Triangle.

Also, you may want to try disabling Safety Shift, too.  Be cognizant of what metering mode you are using.  Evaluative gets a lot criticism, but it is the best mode to use for general photography using 1-pt AF.

[EDIT]. When are you locking exposure?  If you don't know, then don't blame the camera.

[ebiggs1]

"The camera has already been reset and cleared.  No change.  Same behavior.  Using Evaluative Metering, too."

This is why you do the outdoor test in addition to resetting it.  Just resetting the camera doesn't tell you the camera is working properly. If the test with basic settings proves to produce properly exposed pictures there is nothing wrong with the camera and some other setting you made is wrong.

[ebiggs1]

"Do not use ISO Auto in Tv or Av modes.  Always dial in an ISO when using those modes.  Never let the camera control more than none leg of the Expousre Triangle."

And, most likely the "wrong setting" and why the full reset and outdoor test is important.  When troubleshooting you need to know you are starting from ground zero. Otherwise you will just chase your tail, so to speak.

[kvbarkley]

Could this also be a sticking aperture on the Sigma lens?

[Waddizzle]

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@kvbarkley wrote:

Could this also be a sticking aperture on the Sigma lens?

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Anything is possible.  Except for the that John's test shot results had a wide variation in exposure, while mine did not. 

???

[vizualequalizer]

Hey guys, I really appreciate all the feedback and help. 

I did do outdoor testing and the same issue. I should have thought of this earlier, but I tested it with my Rebel 1Ti and have the same issue although it is much less exagerated, only about 1/3 - 2/3 stop difference. 

I will post my findings and conclusion in new post more approriately named something like OVF over exposure vs LV. ISO double is incorrect title for this issue, I belieive. I will post the link to that new thread in here via edit.

I will say that most of us are experienced photographers and that this over exposure issue is simple. The eos 90d does it in every setting that I continue to explore.

That being said, it's not like the eos 90d is some super complicated mystery. I haven't found any elusive or secret settings that could be the perpetraitor. I just find it very odd that the OVF adds almost a full 2 stops of exposure versus LV mode.

I'll post new link here to new post aptly named with some outdoor shots and shots with the Rebel T1i and details.

Thanks to all for collaboration and constructive criticism and help. Post will be later today at the earliest.

Thanks.

[Waddizzle]

Make the mirror box is dust free with a rocket blower.  I do not think 1/3 of a stop is major, but 2 stops is bad.