# Do EF-S lenses have a crop factor?

## Do EF-S lenses have a crop factor?

Focal Length Equivalent (Crop Factor) Throughout this article we frequently reference focal length equivalent, or crop factor. Canon APS-C cameras have a 1.6x crop factor, meaning that a 50mm EF-S lens will behave like an 80mm lens would on a 35mm camera.

### How do you calculate the crop factor of a lens?

The math to derive the crop factor is quite simple. Knowing the physical size of the sensor, you first calculate the diagonal using Pythagorean Theorem (a² + b² = c²), then divide the number by the diagonal of the crop sensor.

What is 12mm on a crop sensor?

The Rokinon 12mm f/2.0 is an APS-C lens, meaning it was designed to provide a 35mm (full frame) equivalent focal length of 18mm. Although specifically designed for crop sensors, this lens can be used on full frame sensor and micro 4/3 cameras, but with a different effective focal length.

What is 35mm equivalent in APS-C?

Simply multiply your aperture, just as you would your focal length, by your crop factor to find the equivalent full frame aperture. So, a 35mm f/1.8 on APS-C is roughly equivalent to a 50mm f/2.8 on a full-frame camera.

## What is a 18mm lens on a crop sensor?

18mm x 1.6 = 28.8mm. Your 18mm lens will produce a field of view on your crop sensor camera similar to what a 28.8mm lens would on a full frame one. So if you’re looking for a very wide scene, then you might want to pick out a lens that is wider than 18mm to compensate for your crop.

### What is 22mm on crop sensor?

the real focal length is 22mm. it’s a 22mm lens. however if you look at the Field of view from a 35mm full frame camera equivalent, it gives you the same field of view as a 35mm lens.

Is EF or EF-S better?

So if you’re a landscape or architectural shooter, or you just want an ultra-wide angle perspective, it’s better to use a full-frame camera with EF lenses. Plus, EF lenses are much more expensive than EF-S lenses. If you’re on a budget, you’ll appreciate the money you can save by purchasing EF lenses instead.