How to set 2 priorities aperture & shutter-speed on Rebel T6 ?

[Dianoban]

Camera & lens: Rebel T6 & EF-S18-135mm f/3.5-5.6 IS STM

I am going to take pictures of elementary school kids. They are moving constantly and the ambient light, shine, cloudy, rainy and shadows, is also changing rapidly.  I need an aperture F11 for a reasonable depth of field and 1/250s shutter speed for freezing the motions.  Can F11 and 1/250s be set up on Rebel T6 simultaneously and how, please?

Thank you.

[Tronhard]

Hi Dian:
It sounds like this is not your bulk standard class photo exercise! I had just inquired about your shooting mode as you were responding to me! 🙂  Given you have set the ISO and aperture and the shutter speed appears to be vairable, I would guess you are now using Av mode, is that correct?

[Dianoban]

Yes, I am going to use AV mode. This will avoid changing the settings if in Manual mode.

[Tronhard]

Exactly.  If you are under some pressure because of your dynamically moving subjects, having to manage any more parameters than absolutely necessary should be very helpful.

[stevet1]

Dianoban,

With rapidly changing lighting conditions, if you use Manual mode, you are constantly going to be changing the settings, and you risk missing the shot.

If you put your camera in Av mode, your camera will automat8cally set a shutter speed roughly twice what your focal length is, so if you shoot at 100mm, your camera will set a shutter speed of 1/200, or thereabouts,, which might be fast enough.

If it's not, you can put your camera in TV mode and set the shutter speed at 1/250 to freeze the motion. Your camera will set the aperture to give you the proper exposure at that speed. It probably won't be f/11, it will probably be closer to f/5.6; but how many kids need to be in focus at any one time anyway? Do need the entire playground, or just one or two kids at a time?

As your shutter speeds go up, your aperture numbers are going to go down.

And yes, as others have suggested, use Auto ISO, especially if your lighting conditions are going to be rapidly changing.

Steve Thomas

[Dianoban]

Thank you.

Yes, I am going use Av mode.  Certainly do not want to change settings during shooting.  That will surely miss a lot of exciting moments. 

I'll use Av mode, f/8 and ISO800, and leave Shutter speed to the camera.  I hope to get 1/4000s in sunshine light and 1/200s in cloudy day light.  .

[stevet1]

Dianoban,

1/4000 is way more than you need. That might be more appropriate if you were trying to freeze the motion of a speeding bullet, or if you had your camera pointed directly at the sun. (which I wouldn't remmend). 

If you set an aperture of f8 on a bright sunny day, you will probably see shutter speeds in the 320 to 400 range and ISO of around 100 to 125 us8ng Auto ISO.

In cloudy conditions, the shutter speed will drop. If it drops too low, and you are getting some blurring, you can widen your aperture to below f/8, or raise your ISO, which would allow faster shutter speeds.

Steve Thomas

[normadel]

Simply put, you can't have multiple priorities. It's either Shutter priority OR Aperture priority.  You are talking about MANUAL settings of aperture and shutter speed. Which doesn't mean proper exposure, unless you are lucky enough in a specific lighting situation.

It sounds like you may want to use Shutter priority, and let the camera set the proper aperture for correct exposure. You can vary the aperture by changing ISO setting manually.

[stevet1]

normadel

Could you expound on your last paragraph a little bit?

Would it be safe to assume that if I'm in shutter priority with a fixed shutter speed,  as I raise the ISO, the camera will gradually set a smaller and smaller aperture?

Steve Thomas

[FloridaDrafter]

Steve, basically ISO will allow you to adjust either leg of the triangle that you don't have "fixed". I do it mostly in Av to adjust my shutter when shooting macro handheld. I know I need f/xx to get the proper DOF but I also want a shutter speed fast enough to freeze action. So I set my aperture in Av mode then adjust ISO to get an effective shutter.

Newton

[normadel]

Yes, exactly. 

Do bear in mind that increasing ISO can lead to image noise, which can become noticeable and objectionable at extremes.