DSLR (Digital Single Lens Reflex) and mirrorless cameras are the two main types of digital cameras.

The lens on a camera performs all of these functions: focusing light onto the sensor, controlling the amount of light entering the camera, and changing the focal length of the lens.

Aperture controls the depth of field, which is the range of distances that appear in focus in a photograph, while shutter speed controls the amount of motion blur, which is the amount of blur that occurs in a photograph due to moving objects.

The ISO setting on a camera controls the sensitivity of the camera's sensor to light. A higher ISO setting makes the camera more sensitive to light, allowing you to take pictures in darker conditions, but it can also introduce noise into the image.

The viewfinder on a camera serves all of these purposes: composing and focusing the shot, displaying the camera's settings, and previewing the image before taking the picture.

The flash on a camera serves all of these purposes: providing additional lighting for low-light conditions, reducing red-eye in portraits, and creating a catchlight in the subject's eyes.

All of these statements are true: a prime lens has a fixed focal length, while a zoom lens has a variable focal length; a prime lens is typically wider than a zoom lens; and a prime lens is typically sharper than a zoom lens.

A tripod in photography serves all of these purposes: stabilizing the camera and preventing camera shake, allowing for longer exposures, and enabling remote triggering of the camera.

The primary function of a remote shutter release in photography is to trigger the camera remotely, avoiding camera shake that can occur when pressing the shutter button directly on the camera.

A lens hood in photography serves all of these purposes: blocking stray light from entering the lens, protecting the lens from physical damage, and reducing lens flare.

A UV filter in photography serves all of these purposes: protecting the lens from UV rays, reducing haze and improving image clarity, and enhancing color saturation.

A polarizing filter in photography serves all of these purposes: reducing glare and reflections, enhancing color saturation, and darkening the sky in landscape photography.

A neutral density (ND) filter in photography serves all of these purposes: reducing the amount of light entering the lens, creating long-exposure effects, and enabling shallow depth of field in bright conditions.

A graduated neutral density (GND) filter in photography serves all of these purposes: balancing the exposure between the sky and the foreground in landscape photography, creating a smooth transition between bright and dark areas in an image, and reducing the amount of light entering the lens.

The primary function of a macro lens in photography is to capture close-up images of small subjects, allowing photographers to magnify and focus on tiny details.