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 Post subject: AV mode in Canon t3i
PostPosted: Sat Dec 28, 2013 9:27 pm 
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Joined: Sat Dec 28, 2013 9:23 pm
Posts: 3
Hi,

I recently bought canon t3i and started using it. I am interested in learning photography. As a first step, I tried setting the camera in AV mode and set the f number to 3.5 (lowest possible on 18-55 mm kit lens). Even after setting the f value to the lowest possible, I see that the background is still in focus (not blurred at all). Can you please help me?

I am surely missing something. Please let me know how can I get the blurred background?

Thanks!!


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 Post subject: Re: AV mode in Canon t3i
PostPosted: Sun Dec 29, 2013 12:41 am 
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Location: UK
The amount of defocus varies on several factors. The f number is one of them. Also influencing the apparent degree of blur are the focal length of the lens, and the relative distance between subject and background.

To get f/3.5 I take it you were using the lens at 18mm? Because of the wide angle, the degree of blur looks smaller, so more appears to be in focus. If you go to the 55mm end, even though it is f/5.6, you can get more apparent background blur.

If the subject is closer to the camera and you focus on that, the background becomes more defocused.

Have a play with that and see how you get on. If that still doesn't give enough of the blur effect, then a different lens may be required. For example, the cheap EF 50mm f/1.8 II lens would give significantly more potential in this respect. It does depend on the type of shot you are doing if that would be suitable or not.

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Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
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 Post subject: Re: AV mode in Canon t3i
PostPosted: Sun Dec 29, 2013 1:14 am 
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Joined: Sat Dec 28, 2013 9:23 pm
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Thanks for the reply. I did try in 55mm with f5.6. I don't notice any blur at all. The entire picture is completely in focus. I tried both indoor and outdoor and its the same :(

Can you please let me know if there is something I need to verify and make sure I got the other settings right? This is my first attempt using DSLR and I not able to get the defocus properly :(


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 Post subject: Re: AV mode in Canon t3i
PostPosted: Sun Dec 29, 2013 12:48 pm 
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Can you post or link to examples of what you're getting at the moment?

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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 Post subject: Re: AV mode in Canon t3i
PostPosted: Sun Dec 29, 2013 12:58 pm 
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Hi lilsunshine,

Have you found Gordon's tutorials yet? Two may be of interest:

DSLR Tips Workshop: How to take portraits with blurred backgrounds

DSLR Tips Workshop: How to photograph landscapes with lots in focus

The second one is, of course, going for the exact opposite of what you are trying to achieve but it might help you spot your problem.

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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 Post subject: Re: AV mode in Canon t3i
PostPosted: Sun Jan 05, 2014 4:19 am 
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Joined: Sat Dec 28, 2013 9:23 pm
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popo wrote:
Can you post or link to examples of what you're getting at the moment?


thanks for the response. I don't see an option to add the attachments. Do I need to host the images on some external site and post the link? Is there no way to attach the images here?


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 Post subject: Re: AV mode in Canon t3i
PostPosted: Sun Jan 05, 2014 5:58 am 
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One simple method is to focus on something that is physically close to your lens, and have a background that is a lot further away.

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Sigma 10-20mm f/4-5.6 EX, Canon EF-S 18-55mm f/3.5-5.6 II
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Vivitar 50mm f/1.8 for OM System


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