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Thread started 21 Jun 2010 (Monday) 14:39
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Raynox DCR-250 technical DOF question.

 
frule
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Jun 21, 2010 14:39 |  #1

I've been using a Raynox DCR-250 on a Canon 70-300IS lens(Canon T2i) and have a question about depth-of-field.Will the depth-of-field be the same at 1:1 magnification with this setup versus a Canon 60mm macro lens at 1:1 magnification(both setups at same f16 apertures)?

Thanks! Fred




  
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LordV
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Jun 21, 2010 15:29 |  #2

Basically the answer is yes the DOF will be the same. DOF in macro just depends on the magnification and the aperture, not the lens system producing the magnification. I think there may be some minor differences caused by some lens combinations slightly changing the aperture but they really are rather minor.
Brian v.


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frule
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Jun 21, 2010 21:45 |  #3

Brian,
That's what I thought the answer would be.The reason I asked was to make sure that there was not a way to increase the DOF somewhat and still stay at apertures large enough to not cause too much softening from diffraction.But,as usual,there's no free lunch!

Thanks,Fred




  
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LordV
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Jun 22, 2010 00:57 |  #4

Wider angle lens systems can give the appearance of more DOF vs longer lenses at the same magnification simply because the OOF areas are more recognisable and hence don't appear to quite as OOF.
Brian V.


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frule
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Jun 22, 2010 11:31 |  #5

LordV wrote in post #10404874 (external link)
Wider angle lens systems can give the appearance of more DOF vs longer lenses at the same magnification simply because the OOF areas are more recognisable and hence don't appear to quite as OOF.
Brian V.

In that case("appearance of more DOF"),wouldn't the OOF areas being more OOF be preferable because it isolates the subject?

Also,in the case of wider angle lens systems(I assume you mean something like the 60mm Canon vs the 100mm Canon macro lenses),why is there not more ACTUAL DOF,along with some perspective change.....if at the same aperture?

Thanks!




  
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LordV
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Jun 23, 2010 00:38 |  #6

frule wrote in post #10406878 (external link)
In that case("appearance of more DOF"),wouldn't the OOF areas being more OOF be preferable because it isolates the subject?

Also,in the case of wider angle lens systems(I assume you mean something like the 60mm Canon vs the 100mm Canon macro lenses),why is there not more ACTUAL DOF,along with some perspective change.....if at the same aperture?

Thanks!

Yes longer focal length lenses are often used for their nicer bokeh.

Re shorter focal lengths I was actually thinking of even shorter lenses say 35mm or smaller - you certainly get a big perspective change but the focus point tends to be only just in front of the lens if shooting near 1:1
Brian v.


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Macro Hints and tips
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Raynox DCR-250 technical DOF question.
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