knessr

Simply put, when you set the aperture, the camera sends that aperture setting to the lens via the contacts between the camera body and lens. It all happens electronically.

jerryc41 Loc: Catskill Mts of NY

BebuLamar

The question is when and not how.

jackpi Loc: Southwest Ohio

On mirrorless cameras:

Aperture or Manual Mode: The aperture is set for the exposure by the user and remains at that value until and while the shot is taken.

Shutter or Program Mode: The aperture will change to the value required for proper exposure for the scene pointed to by the camera. Pointing the camera to a lighter or darker area will result in the aperture changing accordingly to obtain a proper exposure.

I checked this out using both Sony and Fuji mirrorless cameras (I have four mirrorless cameras)

What-you-see-is-what-you-get (WYSIWUG) is a characteristic of mirrorless cameras and is not possible if the aperture remains wide open until the shutter is released.

User ID

Depending upon the type of SLR from which the
adapted lens was borrowed, and also depending
on the type of adapter in use, various functions
will or will not mimic the way that lens operated
on its native SLR. Another variable is the camera
onto which the SLR lens is adapted.

The possible variations are seemingly endless.
In "Smart Adapter Land", anarchy rules. But over
in "Dumb Adapter Land" there is stability. There
you'll find only the slightest minor variations of
typical 1930's to 1950's SLR lens operation, and
that means your fingers drive both iris and focus,
same as all of those totally manual Zhong Yi and
Mitakon, etc lenses being sold today, all of which
operate alike on both Live View and SLR bodies.


`

jackpi Loc: Southwest Ohio

Incorrect. Mirrorless cameras are WYSIWYG. That is not possible if the aperture stays open until the moment thee picture is taken.

jackpi Loc: Southwest Ohio

If you change the aperture in a mirrorless camera while looking at the screen or the EVF and the image remains the same, it is because the shutter speed or ISO has changed. The EVF or screen are NOT compensating.

jackpi Loc: Southwest Ohio

This does not apply to mirrorless cameras.

jackpi Loc: Southwest Ohio

So, the Canon M5 is not WYSIWYG? I'm surprised. Is it possible the manual is incorrect? Have you tested this for yourself?

jackpi Loc: Southwest Ohio

Mirrorless cameras don't adjust the aperture during focusing.

jackpi Loc: Southwest Ohio

Assuming you have checked your statement with a Canon mirrorless camera, Canon mirrorless cameras don't work the same way as Sony mirrorless cameras.

jackpi Loc: Southwest Ohio

You had better check this while looking into the lens of your cameras. Also explain how the camera changes the aperture of your Fuji lens on those lenses where the aperture is set manually with a ring on the lens and can't be changed by the camera.

User ID

`



That will be true when the WYSIWYG option
is authentic, and if the user has enabled it,
which is not always the case.

Live View WYSIWYG bodies offer up to three
settings, but not every Live View body offers
all three. Some have only two. Those three
settings, in order of authenticity, are:

1. Off [no WYSIWYG]
2. Exposure Simulation ["fake WYSIWYG"]
3. Full Preview [authentic WYSIWYG]

In an overly broad generalization, most Live
View bodies, and also Live View SLR modes,
can be toggled between "1." and "2." above.

"3." is not offered on all Live View cameras,
and where available is usually a momentary
hold button, not a mode or toggle. A reason
for consigning it to momentary hold is that
100% WYSIWYG will preview EVERYTHING,
including "Art" filters, etc etc etc and you'd
be hard pressed to deal with exposure and
focus adjustments with that stuff engaged.

Thaz the "broad strokes" picture. Individual
camera models will offer many variations.
One odd variation is where "WYSIWYG Off"
is still showing REAL DoF preview, even tho
viewing brightness is being artificially held
constant. In such a camera the iris will only
fully open up during focusing.

`

User ID

" Mirrorless cameras don't adjust
the aperture during focusing. " .... ? ! ?

Some do.

Some don't.

Some do sometimes but not at other times.

There are countless statements in this thread
that refer to operation of "mirrorless cameras"
and it is verrrry significant that "cameras" is
PLURAL. This means the writer is generalizing
based on a number of flawed sources such as:

1. Hearsay, forum posts, "expert" articles, etc
2. Experience with just one camera
3. Experience with just one brand.
4. Experience with multiple brands and models
and multiple combinations of lenses, modes etc

Number "4." would clearly be the more accurate
observer, and ought to offer quite enuf variety, if
well-observed, to school the observer to NEVER
generalize about the operations of "mirrorless
cameras" PLURAL.

I have 6 different Sony models, 2 of Panasonic,
1 by Olympus. These have taught me that there
is no general rule about iris operation, nor about
anything else. I've got 2 identical Sonys running
2 different firmware levels, and those 2 differ in
certain functions. There's just no generalizing !

`

CatMarley Loc: North Carolina

That is the difference between a dslr and a mirrorless. A dslr has to have the lens diaphragm wide open so that you can see the subject. If that were not the case. the viewfinder would be too dim for you to see or rhe focusing system to focus. When you push the shutter release, the lens is commanded to stop down the aperture and the shutter then opens and closes. So what you see is never what the sensor sees. The mirrorless has an electronic viewfinder that will see exactly what the sensor sees in terms of light and dark, because the lens is already stopped down to the aperture at which the exposure will be made. Because of this, what you see in the viewfinder is a true representation of the exposure. This is one of the big advantages of the mirrorless.