[OM] Re: Apertures, where is f22 ?

[swisspace]

This is where I hope my investment in the 180f2 comes into it's own, the 
  180F2 is also a macro lens well it goes to 1:2 . now on the E-1 it 
becomes a 360f2 macro and with the 1.4x teleconvertor a 500f2.8 macro.

So if my theory is correct you should get a deeper depth of field for a 
given subject, although after just writing this down I am not so 
convinced this will be the case, First thing I will be trying though, 
when my adapter arrives.

Ian W



John A. Lind wrote:

> 
> The 50/3.5 stops down to f/22 and the 135/4.5 stops down to f/45 to allow 
> the greater depth of field when it's desired at high magnification . . . 
> the trade-off being some softening from aperture diffraction to gain 
> additional depth of field.  With high magnification macros, something is 
> either in or out of the depth of field; there's nearly zero "boundary" zone 
> before it's unmistakably out of focus.
> 
> -- John Lind
> 
> 
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