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Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.


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Old October 13th, 2011, 03:09 AM   #1
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Bokeh - Tamron 17-50mm

Hi,

I have been using the Tamron 17-50mm and all in all very happy. To get bokeh I need to be around 1ft or under away from my subject shooting at f.2.8. I would like to buy or hire a lens where I could get good bokeh on a subject which is maybe 4 or 5 feet away. Anything out there which could do that for me? I was hoping that my tamron would.do it but as soon.as I step to around 4ft away from my subject everything is in focus. I then press the magnify button and make sure my subject is in foucs but when I then press record everything including the backgroud looks to be in.focus. I am shooting at 1920, 25fps (50)shutter speed.
Tariq Peter is offline   Reply With Quote
Old October 13th, 2011, 06:11 AM   #2
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Re: Bokeh - Tamron 17-50mm

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Originally Posted by Tariq Peter View Post
Hi,

I have been using the Tamron 17-50mm and all in all very happy. To get bokeh I need to be around 1ft or under away from my subject shooting at f.2.8. I would like to buy or hire a lens where I could get good bokeh on a subject which is maybe 4 or 5 feet away. Anything out there which could do that for me? I was hoping that my tamron would.do it but as soon.as I step to around 4ft away from my subject everything is in focus. I then press the magnify button and make sure my subject is in foucs but when I then press record everything including the backgroud looks to be in.focus. I am shooting at 1920, 25fps (50)shutter speed.
There is no mystery to this. If you wan't a shallower DOF, you need a wider maximum aperture, other things being equal.

Why not have a play with a DOF calculator to help you understand what's going on?

Online Depth of Field Calculator

At 4 ft, wide open your lens at 17 should have a DOF of 1.88 ft, going down to 0.2 ft at 50mm.

Things to bear in mind:

1. You will struggle to shoot wide angles with a shallow DOF.
2. You will struggle to keep your subject in focus if you do manage to get a faster lens.
3. What you want to see might not be practical given your constraints - you can't defeat physics.
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