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    After thinking about it a little more they...

    After thinking about it a little more they probably have the focal length conversion table to adjust the circle of confusion. Generally, the circle of confusion is calculated based on making a 8"X10"...
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    I'm not very familiar with expoaperture, but one...

    I'm not very familiar with expoaperture, but one reason I can think of is that given the same lens, you would need to be further from the subject with a cropped sensor than with a full frame camera...
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    Sticky: D70 60mm micro-nikkor full set of extension...

    D70
    60mm micro-nikkor
    full set of extension tubes (gives around 2.4:1 :))
    The spider's body was about 4.5mm long.

    http://static.flickr.com/103/289995752_f05d2f8cf2.jpg
    Larger available at...
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    The focal length will be the actual focal length,...

    The focal length will be the actual focal length, so it will be 50mm with a 50mm lens, not 50mm x 1.5 or 1.6. The actual dof for a certain lens at a given aperture will be the same for any camera....
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