[LRflex] Re: Speculation....galore!
- From: "telyt@xxxxxxxxxxxxx" <telyt@xxxxxxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Thu, 18 Oct 2007 12:18:23 -0400
> 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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