Aperture

Everything you need to know about aperture

What is Aperture?

Aperture is how big the opening is and this affects the amount of light to enter and the depth of field.  As you can see from below the bigger the opening the smaller the number. (I know it’s annoying, but thats just the way it is) 

Aperture

How is aperture measured and changed?

Aperture is measure in f stops. 

I know what your thinking why can’t the numbers go up as the opening gets bigger. I thought the exact same thing when I first started, unfortunately, Its a mathematical thing, and maths was never my favourite subject. What you need to know is that from each number to the next, the aperture decreases to half it’s size, allowing 50% less light through.

Most DSLR go up in increments of one third of a light stop. as shown below. Moving from f2.8 to f4 is a whole stop of light, but you could move a 1/3 of a stop from f2.8 to f3.2.

1.0, 1.1, 1.2, 1.4, 1.6, 1.8, 2.0, 202, 2.5, 2.8, 3.2, 3.5, 4.0, 4.5, 5.0, 5.6, 6.3, 7.1, 8.0, 9.0, 10.0, 11.0, 13.0, 14.0, 16.0, 18.0, 20.0, and 22.0.

The easiest way to show you how this effects your exposure is to show you. 

Can you see how the bigger the opening the more light comes in, Good. 

Now to the fun bit, because Aperture isn’t about just exposure its about depth of field. (This is how blurry your background it)

How Aperture effects depth of field?

Depth of Field is how much is in focus. A shallower/ Narrower depth of field (DOF) means less will be in focus. Life the top row. in order to achieve this you need a wider/ aperture, like f2.8. 

However, you want more of the background in focus, you will need to increase your depth of field and therefore need a narrower aperture like f/22

Can you see the difference?

So which f stop do you need?

There are no set rules on this one, but what I will say is that here are a few starting points. 

f/1.4: This is great for shooting in low light, but be careful of the shallow depth of field, because it can be too shallow. 
f/2.8- f/4Still good for low light situations, but allows for more definition in facial features as it has a deeper depth of field. Great for close up single person portraits.

f/5.6: Good for photos of 2 people, not very good in low light conditions though. So either use a reflector or bounce some flash. 
f/8: My street mode, I use f/8-f/11 when out and about.
f/11: This is often where your lens will be at its sharpest so it’s great for portraits, if you’ve got a clean or story telling background. 
f/16: Shooting in the sun requires a small aperture, making this is a good ‘go to’ point for these conditions.
f/22: Best for landscapes where noticeable detail in the foreground is required.

 

Still confused??? That's ok. Why not drop me a question below.

25 Comments

  1. this is soooo useful! Until today, I was completely unaware of this. You explain it so well! I have a question though. It might be silly, but oh well. Does the same apply to videos too?

    I have seen various videos where the fairy lights in the background are kind of out of focus. How do we achieve this with a DSLR in video mode?

    Nupur
  2. I would like to show appreciation to the writer for rescuing me from such a matter. As a result of researching throughout the search engines and seeing principles which were not pleasant, I believed my entire life was done. Living devoid of the strategies to the problems you’ve resolved all through your entire article content is a serious case, as well as those that might have in a wrong way damaged my career if I hadn’t come across your site. Your personal competence and kindness in dealing with the whole thing was priceless. I don’t know what I would have done if I had not come across such a subject like this. I’m able to at this moment look forward to my future. Thanks so much for your high quality and effective guide. I won’t hesitate to propose your blog post to any person who needs counselling about this subject matter.

  3. Thanks for your personal marvelous posting! I genuinely enjoyed reading it, you happen to be a great author.
    I will be sure to bookmark your blog and may
    come back at some point. I want to encourage that you continue your great posts, have a
    nice day!

  4. Great post. I was checking continuously this blog and I’m impressed!
    Extremely helpful info specially the last part 🙂 I care for such
    information much. I was looking for this particular info for a very long time.
    Thank you and good luck.

  5. Hello there! I could have sworn I’ve been to this
    web site before but after browsing through some
    of the posts I realized it’s new to me. Anyhow, I’m definitely
    happy I came across it and I’ll be bookmarking it
    and checking back regularly!

  6. First off I would like to say great blog! I had a quick question that I’d like to ask if you do
    not mind. I was curious to find out how you center yourself and clear your head prior to writing.
    I have had a tough time clearing my thoughts in getting my thoughts out.
    I do take pleasure in writing however it just seems like the first 10 to 15 minutes are generally wasted simply
    just trying to figure out how to begin. Any recommendations or tips?
    Many thanks!

  7. Its like you read my mind! You seem to know a lot about this, like you
    wrote the book in it or something. I think that you can do with a
    few pics to drive the message home a bit, but instead
    of that, this is wonderful blog. A great read. I will definitely be back.

    g
  8. My developer is trying to persuade me to move to .net from PHP.

    I have always disliked the idea because of the expenses.
    But he’s tryiong none the less. I’ve been using Movable-type on several websites for about
    a year and am worried about switching to another platform.
    I have heard excellent things about blogengine.net.
    Is there a way I can import all my wordpress content into it?
    Any help would be really appreciated!

    g
  9. Undeniably believe that that you stated. Your favourite reason seemed to be at the net the easiest thing to
    be mindful of. I say to you, I certainly get annoyed while other
    people think about concerns that they plainly don’t understand about.
    You controlled to hit the nail upon the top
    as well as outlined out the entire thing with no need side-effects ,
    people can take a signal. Will likely be again to get more.
    Thanks

  10. It’s remarkable to pay a quick visit this web site and
    reading the views of all colleagues concerning this piece of writing, while I am also zealous of getting experience.

    g

Leave a Reply

Your email address will not be published.