A person seen from behind on a hillside at dusk, holding a camera to their eye, the camera mostly hidden by their head and hands
AI-generated image, not a photograph of a real person or place.
nikonfullframecamera

VIEWFINDERS, EXPLAINED

A window,
or a tiny screen.

90° turned by the prism

  • Optical: no lag
  • Electronic: see the exposure
  • Both: steadier than a screen
  • Choose for how you shoot

Put your eye to a camera and you see one of two things.

An optical viewfinder shows the scene itself, sent up by a mirror and turned by a prism. An electronic one shows the sensor's view on a small screen, with your settings already applied.

Updated

Compare them

THE SHORT ANSWER

Each finder
wins somewhere.

Optical finders show the world as it is.
Electronic ones show the picture you will get.

OPTICAL

Light all the way

A mirror sends the lens's image up to a five-sided prism, which turns it through 90° and sets it the right way around. It works with the camera switched off.

See the numbers

ELECTRONIC

The sensor's view

A small screen behind the eyepiece shows what the sensor records, so you see exposure and white balance before you shoot, plus aids such as focus peaking.

Compare them

TRADE-OFFS

Lag or blackout

Optical finders have essentially no lag but go dark while the mirror flips up. Electronic ones can lag slightly and turn grainy in very dim light.

Try both

A QUICK FINDER CHECK

What do you
mostly shoot?

Pick a situation to see which type of viewfinder has the edge, according to the sources below. The bar shows how strong the advantage is.

Finder check

Choose a situation
Fast action, birds or sportOptical edge

An optical finder shows the scene with essentially zero lag. Electronic finders always have some lag, though it is minimal in many recent cameras.

Dim rooms or night scenesOptical edge

An optical view stays sharp, if dark. Electronic finders rely on the sensor and can turn grainy in dark rooms, and lag more with long exposure times.

Learning exposure and colorElectronic edge

The electronic preview includes your exposure and white balance settings, so what you see can match the photo you take.

Focusing old manual lensesElectronic edge

Focus peaking draws colored outlines on the parts of the scene that are in focus, which an optical finder cannot show.

Checking shots in bright sunElectronic edge

An electronic finder is shaded from ambient light and lets you review photos and menus at your eye, which an optical finder cannot.

Sources: Wikipedia, Electronic viewfinder; Digital Photography School, Optical Versus Electronic Viewfinders.

Recent electronic finders have narrowed many of these gaps; trying both in person is the surest test.

TWO NUMBERS WORTH KNOWING

A right angle
and a blink.

One figure from inside an optical finder,
one on when its blackout becomes visible.

90°

Angle a pentaprism turns the light

A pentaprism deviates a beam by a constant 90° with two internal reflections, so the image is not flipped. A roof section corrects the left-right reversal left by the mirror.

PENTAPRISM · WIKIPEDIA

1/30 s

Shutter speed where blackout shows

Mirror blackout is barely noticeable at fast speeds, but at about 1/30 s or slower an optical finder shows a brief blank frame as the mirror flips up.

BLACKOUT · DIGITAL PHOTOGRAPHY SCHOOL

Some lighter cameras use a pentamirror, three mirrors instead of a solid prism. It is lighter, but each pass through the glass loses a little brightness, and the mirrors can drift out of alignment.

FOUR WAYS TO TEST A FINDER

Look before
you choose.

A gull gliding against a pale overcast sky, wings fully spread
AI-generated image, not a photograph of a real person or place.

In a camera store or with a friend's camera, a few minutes with each type tells you more than a spec sheet.

  1. Pan with something moving

    Follow a passing car or bird. Any lag in an electronic finder shows as the view trailing behind the subject.

  2. Try a dim corner

    Look into a dark room. An optical view stays sharp but dim; an electronic view may look brighter but grainier.

  3. Change the exposure

    Turn the exposure compensation dial. An electronic view brightens and darkens to match; an optical view stays the same.

  4. Hold it to your eye

    An electronic finder is a tiny screen held less than an inch from your eye. Check the view is comfortable before you buy.

WHY REFLEX CAMERAS LOOK THROUGH THE LENS

No parallax,
whatever the lens.

A clear triangular glass prism on a dark wooden table, bending a beam of window light into a rainbow
AI-generated image, not a photograph of a real person or place.

A separate viewing window sees the scene from a slightly different place than the lens, an error called parallax that matters most close up. Single-lens reflex cameras look through the taking lens itself, so changing lenses never upsets the view.

When you press the shutter, the mirror flips out of the way, the shutter opens and closes, and the mirror drops back. Some cameras combine both systems in a hybrid finder that can show an optical or a digital view.

Questions

Questions people ask

What is the difference between optical and electronic viewfinders?

An optical viewfinder uses a mirror and prism to send the image from the lens to your eye. An electronic viewfinder shows the sensor's image on a small LCD or OLED screen behind an eyepiece.

Does an optical viewfinder work with the camera turned off?

Yes. It is a purely optical path, like looking through binoculars, so it needs no power. An electronic viewfinder needs the camera switched on.

Why does an optical viewfinder go dark when I take a picture?

The mirror flips up to let light reach the sensor, so the finder briefly blacks out. It is hard to notice at fast speeds but obvious at about 1/30 s or slower.

Do electronic viewfinders lag?

They can, because the image has to be processed and displayed, especially with longer exposure times. Digital Photography School notes the lag is minimal in many recent cameras.

What is focus peaking?

A display aid in electronic viewfinders and screens that outlines the in-focus parts of the scene in color, which helps when focusing by hand.

Sources

Where the facts come from

  1. Wikipedia: Electronic viewfinder
  2. Wikipedia: Pentaprism
  3. Wikipedia: Viewfinder
  4. Digital Photography School: Optical Versus Electronic Viewfinders

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