Question about Canon Cameras

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My 17-40 canon lens on a 5d body. i have ISO50 Fstop22 shutter 30sec and i a would think i can lock focus on centre or foreground and gert a sharp result but its not the case. My photos are a bit sharp but not the same as F4 ISO100 where the focus area is smaller but sharp. What am i doping wrong?

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  • johnnypixel Nov 18, 2008

    Thankyou!

    That was spot on!

    I have now found that the canon 5D will handle up to about F16 before it starts difracting.

    my other camera nikon d70 28mm @ F22 iso 200 would be sharp because it was also shooting at 28mm instead of full frame 17mm.

    Turns out that The Zoom distance is a factor for sharpness too.

    I will try my 5D on 17mm @f11 ISO50 and work up from there on the stops.

    Im not too fussy on sharpness but i just want it better than my d70! after all it is a full frame 12.3 megapixel camera.


    Thanks so much for your response it was something I knew nothing about.

    Cheers
    John


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The aperture (f/ ) is closed too much and what happens is 'diffraction'
read more about diffraction here:
http://www.luminous-landscape.com/tutorials/understanding-series/u-diffraction.shtml

good day
yitzy

Posted on Nov 18, 2008

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