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Camera Basics: Aperture (or focal-ratio, f-stop)

Post requested by a dear friend, K, regarding camera basics (namely aperture). A few other camera basics posts will be coming up in the next few weeks covering topics like ISO, white balance, composition, etc. Please keep in mind that this is a BASIC review – for more information, either send me an e-mail or comment to request something more in depth.

WHAT IS APERTURE?
I could go into a long definition, but I’m going to keep it simple as there are plenty of other resources that will give you a more lengthy answer. Think back to pinhole cameras – literally a box with a hole in it (the hole let in light that hit the film in order to create a photograph). The hole is the aperture. Nowadays with digital cameras, you’d probably recognize aperture by the following numbers: 4, 5.6, 8, 11, 16, 22. It ranges anywhere from 1.2 (sometimes 0.8 even) to 32 – rarely above or below that range (starts to cause issues).

If it’s easier, think of the camera as an eye. The camera body is the brain, the lens is the lens, and the aperture is the size of the pupil. When you walk into a dark room, your pupils dilate – why? To let in more light so you can see better. When you walk into a bright area, your pupils constrict, to let in less light. Keep this in mind for the next section.

WHAT DO THE NUMBERS MEAN?
The larger the number, the smaller the aperture – confusing, right? Think of it as (1) ONE, as a whole. Then put the aperture UNDER one, so it creates a fraction. Therefore, 1/4 would be larger than 1/22, correct? Therefore, f/4 (or an aperture of 1/4 or 4) is larger than f/22. With a smaller hole, less light is let in; with a larger hole, more light is let in.

WHAT DOES APERTURE DO?
Basically, aperture controls the amount of light that is let into your camera. It also controls your DEPTH OF FIELD, or how much is in focus in your photograph. Ever notice that when you take a picture of something really close (macro), that only parts of it are in focus… and when you take a picture of the scenery (wide), lots of it is in focus? That’s the basics of depth of field – which is a whole different post. By controlling your aperture, you control your depth of field.

WHAT IF I LEARN MORE BY DOING VS READING?
Why, yes I can help you. Let’s go back to the eye example, because everyone that is reading this has their eyes handy, correct?

The best example for large aperture, less depth of field is: when you’re in a fairly well lit situation – now go look at a clock (preferably analog) – or, really, anything near you. If you really, really focus on that one item… notice how other items that are nearby go out of focus? Larger aperture (smaller number) equals less depth of field.

Now squint. By squinting, you’re essentially “closing down the aperture” (smaller aperture, larger number). See how much MORE is in focus? It does get slightly darker, since you’re letting in less light, however things become more clear. Smaller aperture equals more depth of field.

Now, if you’re in the dark and you squint, since it’s already dark, you’ll probably be able to see less since you’re cutting out TOO much light. However, if you look at a bright light in the dark and squint, you’ll be able to see more.

Fun, huh?

FUN FACTS
1. Again, the camera functions much like an eye. You see things right-side-up, but the camera (and lens) sees it upside-down. The image is flipped in camera so you can see it right-side-up when you go to view the image.

2. For something in real life to be the same size as it is when captured (in a photograph), it needs to be the same distance away from the lens as the lens is to the sensor, a distance which is known as 1:1, which will yield a “true to life” size. Especially important in macro photography.

3. If you want to make a pinhole camera, experiment with a few factors: the size of the box (which could change the size of the film you use), the distance between the lid (with the hole) and the back and the size of the hole. That’s REALLY the best way to learn about aperture hands-on, but it’s not always the most practical way of learning in this busy-busy world.

QUICK EXAMPLE

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*The photos were desaturated to really bring the attention to the depth of field, versus color or any other distracting elements. Instructional, not particularly aesthetic.

The top two images were taken at f/1.4 – you can see how shallow the depth of field is. You can either see the tip of the nose or you can see the eyes, one or the other. Shallow depth of field can be a great ally, especially if you’re taking portraits or have a busy background (lots of people walking around, a fence behind you, etc) and just want to blur it all out. It’s excellent for if you want to highlight part of the photograph and to melt everything else away.

The bottom two images were taken at f/8 – and see how much more detail you can see. The nose goes slight out of focus when you look at the eyes, and vice versa, but nothing even close to what f/1.4 does to a photograph. More depth of field is great for product photography (don’t you want to see all of the detail on that pair of shoes that you’re eyeing online?) or group photographs, to make sure that you can see everyone, even if there are three rows of people.

Anyways, I hope this helps! As this is my first post of this nature, any input would help me help you.

Power of Photography: Tools and Emotions

I had a little birdie trying to get into my house today. It kept hopping around on that wire, flying down to the bottom of the window, back to the top, hanging, flitting around. This was the best shot I was able to capture. The composition feels very lonely; all of the negative space, the solo bird staring out of the frame (creates tension – what is it looking at?). The bird itself feels tense, its wings not outstretched to fly away but bunched together close against its small body. What is it thinking? Why is it there?

This sort of captures how I feel at the moment. Lots of space. Floaty? Not necessarily being alone but feeling lonely, feeling like something is missing. Some color has been taken out of my life, some vitality, some part of me is missing. I’m sitting here, tense, waiting to fly away but something just keeps stopping me from getting to where I want to be, and I can’t figure out what it is or why it’s there, or even what is stopping me.. anyway, that wasn’t the point of this post.

It’s always amazing to me just how powerful photography is as an art form. Sure, we don’t necessarily create in the generally accepted sense of making something out of nothing… but we capture what we see, we have our choice of tools, we shape what we see to how we want to see it – and I’m not referring to Photoshop or other photo manipulation, if you were thinking that route. That bird was flying around in the window. Why did I not capture it while it was flying or while it was upside-down? Why did I not capture more of the window? Why isn’t there something else in the frame? Why did I choose this color palette (or lack of saturation)? Why didn’t I just leave the white balance as it was instead of adding an (almost) sepia tone? 

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Because I wanted it to feel lonely. I wanted that sense of melancholy. I paused that moment in time and shaped it until it became mine – to show the world how I saw it at that moment.

That, to me, is the power of photography.

Thoughts?

Engagements

Two couples I’ve known since high school (semi) recently became engaged – how fun! I had the honor of taking their engagement photographs, and decided to share a few of my favorites:

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Can you grasp at the personality of the couple?

Joshua Tree with the iPhone 4

Sometimes it’s not always the best idea to lug around gear with you. When I feel like I’m getting stuck in a creative rut, I like to go OUT and explore. Of course, the photographer in me wants to document everything, which is why I adore my iPhone 4 (product placement, ew). Could I have gotten better shots with my DSLR? Yes. Did I want to at the time? Probably. Am I still satisfied, was I recharged, did I still have fun hiking and climbing without carrying 15 lbs of gear with me? Yes. Is this post to make a point about how you DON’T need a DSLR? Possibly.

Not to mention I was also able to escape the cold, overcast weather that was haunting the coast while I skipped away 2.5 hours inland for this beautiful location. I am definitely returning again, but with the proper gear next time…