On Fri, Nov 12, 2010 at 12:06 PM, Steven Desjardins <drd1...@gmail.com> wrote:
> How much "throw" of the sensor would you need to focus? a few cm? It's the same as adding extension tubes; the answer depends on the focal length of the lens, and how close you want to focus. If you want to achieve 1:1 macro capability, you need extension equal to the focal length (e.g. 9 cm for a 90mm 1:1 macro). If you're thinking about something like a street photography camera, with wide-to-normal lenses and no macro applications, it might be doable. As a general SLR replacement, probably not. You can use this calculator to get maximum magnification and close focus distance for any focal length and extension: http://www.cambridgeincolour.com/tutorials/macro-extension-tubes-closeup.htm Just set the native magnification to 0 X and specify the amount of extension and focal length. > If you could move the sensor fast enough, would there be any lens advantage? You couldn't do floating-element correction for close focus, so that would be a downside. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
