Am I just stupid... - Aperture

Discussion in 'Photography Beginners' Forum' started by righteous_bucks, Oct 7, 2009.

  1. righteous_bucks

    righteous_bucks TPF Noob!

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    So, I just ordered my Canon 20d so I've been reading over the specs for it and all, but I have a question about aperture. To change exposure manually, you can change shutter speed, ISO, and aperture, but do you not change the aperture on the actual camera like you do the other two? Or do you change aperture with the lens? When I look through the specs for this camera it doesn't mention aperture settings at all, so I'm confused :confused:

    By the way, the 20d will be my first ever slr camera, so I've never messed with any of these manual exposure settings like this, so that's why this question is probably dumb to most people on here.
     
  2. chip

    chip TPF Noob!

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    you set the aperture on the camera. easiest is set the mode dial to Av and turn the wheel with your right index finger. Shutter speed will be automatically set in Av mode. If you set the mode dial to M you will need to choose aperture and shutter speed yourself.
     
  3. righteous_bucks

    righteous_bucks TPF Noob!

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    Ok thanks for clearing that up for me. Does the 20d have a limit to the different apertures it can be set at? And also, if the aperture is set on the camera, what is the aperture number on the lens mean? Is that saying you can only set the aperture on the camera to that amount when using that lens?
     
  4. chip

    chip TPF Noob!

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    You can only set aperture on the camera. There is an LCD display on top of the camera to show you the aperture setting. You cannot set the aperture on the lens. You need EF-S or EF lenses. The aperture range you can set depends on the lens. I have a 24-105mm lens and it has a maximum aperture of f4. some nicer lenses have a maximum aperture of f2.8 or even bigger.
     
  5. righteous_bucks

    righteous_bucks TPF Noob!

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    Ok awesome, that totally answers all of my questions :) thanks!
     
  6. righteous_bucks

    righteous_bucks TPF Noob!

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    Sorry, one more question! I always read that to get a blurred background in a picture you need to open the aperture as much as possible, but how much do you need to open it in order to get the blur effect? Do you really need a lens that can open to 1.2? haha I'm just looking for the aperture number where blurring begins.
     
  7. benlonghair

    benlonghair TPF Noob!

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    It's relative to the aperture, distance to the subject and length of the lens. A 18mm lens will have pretty much everything from 3' to infinity in focus even at a relatively low f/stop. A 300mm will be razor thin at it's minimum focus distance. As distance increases, so does DoF.
     
  8. righteous_bucks

    righteous_bucks TPF Noob!

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    Ok, thanks!
     
  9. flyin-lowe

    flyin-lowe TPF Noob!

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    My cheap telephoto is a 75-300 mm f 4-5.6. When I have that lens on the lowest number (larger aperture) I can go to when shooting at 75 mm is 4. If I am zoomed in and shooting at 300mm the lowest I can go to is 5.6. You can go to a lot smaller aperture, but this is the largest you can go to. Remember (you probably already know) the smaller the f number the bigger the aperture. It is backwards of what you would expect the first time you learn about it.
     
  10. syphlix

    syphlix TPF Noob!

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  11. Samanax

    Samanax TPF Noob!

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    Getting the background out-of-focus is more than just using a wide open aperture.

    Back to Basics - Depth Of Field

    Depth Of Field

    Tutorial: Depth Of Field

    Depth Of Field Tutorial

    Examples For Understanding Depth Of Field

    Understanding Depth Of Field

    Controlling Depth Of Field

    Tutorials: Depth Of Field

    Understanding Depth Of Field In Photography
     
  12. righteous_bucks

    righteous_bucks TPF Noob!

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    Thanks Samanax, those links helped alot :thumbup: I think I got the idea of it all down pretty good now, I can't wait to try it out!
     

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