One of the first things we learn as photographers are F stops and how we can use them to properly expose a photograph, but there is also such a thing as T stops and we don’t always give them the attention they deserve. Of course, a T-stop may not be essential knowledge on every photo you take, but understanding what a T stop is will give you a better understanding of light, which is never a bad thing for a photographer to have. (It’s also helpful information to have in your bag if you’re going to be lens shopping soon!). And Matt Granger does an amazing job of explaining the difference.
For a while now, Aperture has been Apple’s signature professional photo management app, similar to what Final Cut Pro and Logic Pro have done for video and music. After WWDC, however, things looked a bit bleak for the software after Apple announced its rollout of its new Photos app – the keynote went by with no mention of any updates on Aperture itself. Today, it’s been confirmed by the company that development on the software has officially ended.
As advanced as smartphone cameras are today, they’re still limited by the size they need to be. As a result, most smartphones have a fixed aperture to save space; the iris itself is mad from fixed blades that set the aperture for each camera. But as always, in a time where mobile devices are so engraved into the modern lifestyle, technology is constantly reaching higher ground. In this case, that higher ground is reached by a new type of iris – one made of chemicals that eliminate the need for physical blades.
After discussing exposure in great detail, I would like to turn to a different kind of control – Depth Of Field (A.K.A. DOF). OK. Don’t jump – you are right. Depth Of Field is not a real control, but more of a result of how you used the aperture control.
In simple words Depth of field is the term you use to describe what is inside the focused area of your image and what is left outside of the focused area (and will stay home alone, and eat dry bread and drink stale water. Sorry Jewish mom syndrome…)
As I said before the control that has the most impact on depth of field is aperture. Bigger apertures tend to provide shallower depth of field. That means that if you open a wide aperture (say f/1.8) you will have a narrow location in your image which is focused. If you set your aperture to a small value, say f/22, you will have a huge focused area. The other two controls you can employ to control depth of field are Zoom focal length and camera to object distance. [Read more...]
Aperture is one of the three main controls you can use when you are taking a picture. Along with shutter speed and ISO, aperture controls how light will hit the sensor (OK, old schoolers – hit the film).
In very simple words, aperture is the “size” of the hole the light goes through when it passes the lens. So large apertures will let more light go through then small apertures. Going back to the pipe allegory analogy, we can see the following: If we use smaller aperture, then to keep our exposure unchanged we have to use longer shutter speed, or higher ISO.