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!

[jrhoffman75]

Some other observations; they won't necessarily affect what you are seeing now, but they are things to consider.

1. you stated you used AI Focus mode. That is an "inteligent" mode in the camera that is supposed to switch between One Shot and I Servo depending on whether the camera detects motion. It tends to not be a very effective mode. First, AI Servo is really for situations where the subject is moving towards or away from the camera. It compensates for the fact that if the subject is moving the focus distance could change between when the shutter button is pushed and when the shutter actually fires. Outside of wildlife, sports and kids playing in the backyard you really don't need AI Servo.

Similarly in Live View - you are using people, face, eye detection. None of those are in your subject.

Single point, usually center is what you generally want.

[jrhoffman75]

When you convert and save try these settings:

[Waddizzle]

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@jrhoffman75 wrote:

Hello.

I can't download these files as JPEG; they show up as an unknown file type only 20kb in size.

I did some experimentation with my camera (a 1D series).

I set a fixed ISO of 1600 in Av mode, thus the only variable would be shutter speed. Evaluative metering for both modes. Center single point focus for both modes.

One mode gave a SS of 1/13, the other 1/20.

That seems to support the DPReview post,

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I tried a similar test with a 6D and a Sigma 35mm f/1.4 Art.  I shot at f/4 and ISO 800.  One had 1/8 SS and 1/10 SS.  The camera has no anti-flicker setting.  I tried the same test with a 6D2 and got 1/6 and 1/8 SS.  In both cases, the slower SS was Live View.

[vizualequalizer]

Thanks for all the help.

I am reposting the photos, they should be downloadable. 

I did notice the flicker alert going off when I shot the one in the OVF (Optical View Finder). 

Notice in live view the ISO was 400 and in OVF ISO is 1600. 

live view is IMG_0315 and OVF is IMG_0316

[Waddizzle]

John had asked if you had used ISO Auto, and you replied that you did in a few different modes.  All of those modes allow the camera to control 2 out of the 3 legs of the Exposure Triangle.  The camera my increast the ISO, but also change another setting to balance the expoxure.

You also shot handheld, which means the locked in focus point may have been different.  For Evalluative Metering, this last can make a difference in how the camera may meter a similar scene.  I did my shooting tests from a tiripod, and I would assume that John did the same.

I suggest that you take another set of test shots under more controlled conditions.  Use a tripod,  Because I used Av mode, which is the same as what John had used, I dialed in ISO 800 so the camera only controls the shutter speed.

If you wish to test ISO Auto, then use M mode.  Take a test shot using P mode, and then use those shutter speeds and apertrue settings similar to your test shot.

[vizualequalizer]

Appreciate all the feedback.

I would just like to throw in, that in the P mode, ISO set at 800, I've tried all the different metering modes, but it seems like for whatever reason, in OVF mode the camera is adding significant exposure. 

I've never encountered an issue like this in all my years shooting. My intuition tells me that it is setting somewhere in the menus. I am trouble shooting and holding everything constant whilst adjusting only one variable. But I haven't found the issue.

I find it interesting that in OVF mode the camera is adding that much exposure on it's own. I get that between the two VIEWING modes, there is a diefference in the way it meters. 

In the P mode, holding ISO constant at 800 and the aperterure at F1.8 in live view the SS is at 1/60. In OVF (same constants ISO 800 and F1.8) the SS is 1/6. 

I am most curious as to why!??

P.S. Also surprising is that seems like an isolated incident, as know one else here (so far) or from I'm researching online really has had the same issue. I will try and reset the camera's factory settings.

[jrhoffman75]

Whenever you think the camera is acting strange you should reset the camera to factory settings. It will clear any inadvertent settings. 

[vizualequalizer]

Also FYI. Shooting in M mode, dialing in my own numbers, once set, if dialed in according to live view (correct exposure stop at 0) then once in OVF the exposure stops indicate a full 2 stops lower. That has my curiosity in gear.

[vizualequalizer]

Cleared all the camera settings and still OVF adding +2 stops compared to live view. I don't get it.

[jrhoffman75]

Try a different scene, maybe go outside and use your home as a subject. The current scene is quite challenging with extreme brightness differences.