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October 13th, 2011, 02:09 AM
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#1 |
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Major Player
Join Date: Jun 2007
Location: Manchester England
Posts: 435
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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. |
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October 13th, 2011, 05:11 AM
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#2 | |
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Major Player
Join Date: Apr 2010
Location: Chelmsford England
Posts: 287
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Re: Bokeh - Tamron 17-50mm
Quote:
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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