Join Erik Naso for an in-depth discussion in this video Lenses and aperture, part of What Video Camera Should I Buy?.
- In order to get proper exposure,…you need to figure out how much light…needs to be allowed to pass through the lens,…so you can clearly see your subject,…your shadows and your highlights.…Something to consider when purchasing a lens…is how wide it opens.…Like a water faucet, the more you open a valve,…the more water passes through the spout.…Lenses are similar.…As you open up the blades inside the lens,…the more light passes through.…This is called the aperture.…
As you can see here, the blades open and close…as I increase and decrease the aperture.…A number that tells how wide the aperture is…is called the f-stop.…The lower the number, like 2.8, the wider…the aperture blades are, letting in more light.…The higher the number, like f/16, the tighter…the aperture blades are, restricting light coming in.…Another thing to think about is…how many blades make up the aperture.…
A higher blade count will make the circle…more perfectly round.…This is a big deal, because something beautiful happens…when the iris is all the way open, say at f/1.4.…
Evaluating your production workflow and the camera options out there can save you time, money, and maybe even your sanity. Camera enthusiast Erik Naso is here to help. He'll teach you how to ask the right questions and pick the right camera—balancing "the camera I should buy" with "the camera I want to buy," so you end up happy with your purchase over the long run. Learn how to figure out your budget and needs; understand the different file formats, sensors, and lenses available; and choose the right accessories for any shooting situation.
- Understanding the camera components: sensor, lens, etc.
- Evaluating audio inputs
- Taking your type of production into account
- Deciding on a budget
- Choosing accessories such as tripods and gimbals
- Camera codecs and media cost