Nikon 105mm Macro ...

Started Oct 26, 2012 | Discussions thread
Riccardo Polini
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Re: Nikon 105mm Macro ...
In reply to Mark_A, Oct 27, 2012

Mark_A wrote:

I have been using a 50mm f1.8 with Kenko extension tubes, I am interested in a more convenient way to do macro than that. DOF is an issue, it is pretty minimal with the tubes and at handheld shutterspeeds.

Mark,

DoF depends on magnification and aperture (f/) only (it depends also on the sensor size, but I'll neglect this). You'll not gain any advantage by using a macro lens instead of a normal lens+extension insofar as DoF is concerned. Even the focal length does not afect DoF in close-ups (what affects slightly DoF is the pupillary factor, which is a consequence of asymmetric optical schemes).

In other words, low DoF values are not due to the use of extension per se, but for the consequent increase of the magnification.

A longer lens (i.e. a 105 mm) will allow you longer working distances. A longer "macro" lens will allow you obtaining both larger WDs and better IQ at close distances.

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