Looking at ISO through the viewfinder

Hi there,

This may get a little confusing for which I apologise for.
When looking through the viewfinder I think there is a setting to assign the Fn button to preview your current ISO setting i.e.when you press Fn the viewfinder stays the same or goes lighter or darker.

Would anyone know what setting it is?

Many thanks

Or you could just press the iso button and the iso will show up in the viewfinder.

Hi Marcel,

The ISO value does show up bottom right hand side of the viewfinder but what I am talking about is an actual preview of whatever ISO value you have through the VF. Almost like you would have in live view.

I have had it but must have changed a setting.

wickerman999 said:

Hi there,

This may get a little confusing for which I apologise for.
When looking through the viewfinder I think there is a setting to assign the Fn button to preview your current ISO setting i.e.when you press Fn the viewfinder stays the same or goes lighter or darker.

Would anyone know what setting it is?

Click to expand...

Are you sure you're not thinking of the Preview button itself? Because the darkening of the viewfinder and what not is exactly what happens when you press the Preview button, only it's showing the depth of field your shot will have based on the aperture you've selected; it has nothing to do with ISO.
....

Just to add to what Horoscope said, your viewfinder is an actual view through your lens. You cannot change that view with a different iso (at least not in a useful way). There is no mechanism for that to happen in the viewfinder, you can only see actual light.

As HSF said, you can activate depth of field preview and that will darken your view because it activates the aperture and things will darken as the lens stops down. You could have set the function button to behave as the preview button. To cause what you may have experienced, you could also put yourself in say shutter priority and of course this will cause a change in aperture as you change iso and you would see a corresponding light/dark change if you push the preview button. However, that change is simply the light you see coming through based on the aperture selected. The actual exposure will not necessarily match the lightness or darkness that you will see with the preview button. So in that respect, it's useless for previewing iso. It may explain what you thought was happening.

Hi there,

Ahhhh
Ok, many thanks for the info.
What you have described is exactly what was happening.

Cheers