Re: [OM] IMG: More Insects, New Approach

[Wayne Harridge]

Note that the light loss is dependent on magnification (however you might
achieve it: close-up lenses, extension tubes, teleconverters, etc.) !

...Wayne

> 
>     You probably already know this, but in case you don't the
> magnification
> will be roughly:
> 
>     MAG = (FL + EXT)/FL
> 
> where FL is the focal length of the lens and EXT is the length of the
> extension tube.  The drawback to using extesion tubes is that the
> amount of
> light falling on the film/sensor is the square of the reciprocal of
> MAG.
> This becomes a bit of a problem in low-light situations such as a
> flower in
> dense shade, especially if you need the short DOF advantage of a large
> aperture to defocus background clutter.
> 
> Chris
> 
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