[LRflex] Re: Speculation....galore!

> 1.  Most film lenses don't perform well towards the edge of sensors 
> because of the very different incidence angle and the need for light to 
> go along a 'tube' for each pixel; so if you want good performance from a 
> full frame sensor, you need a lens designed for it.  Just look at the 
> prices of Canon's L lenses, and you can see the consequence.

Most film lenses are not Leica lenses.  The R flange-to sensor distance is
greater than any other 35mm-based system so they are typically more
telecentric than most lenses.  Many users of full-frame Canon cameras are
finding they get better performance with R lenses than with Canon lenses,
particularly the more troublesome wide-angle lenses.

> 2.  As well as allowing the effective use of older lenses, smaller 
> sensors, e.g. APS-C size, increase the effective magnification of the 
> lens.

No more than you'd get by cropping a larger image area.  The most
significant difference is that the sensor maker has decided for you which
part of your image circle to throw away.  IM not-so-H O the camera makers
have successfully convinced consumers that their lemons are really lemonade.

Doug Herr
Birdman of Sacramento
http://www.wildlightphoto.com


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