On Thu, Apr 29, 2010 at 10:22 PM, Rob Studdert <[email protected]> wrote: > On 30/04/2010, Adam Maas <[email protected]> wrote: > >> Bruce, there's no appreciable size difference between 35mm film and FF >> sensors. Both are within a tenth or two of a millimeter of the nominal >> 36x24mm frame size. Certainly there's not enough difference to have >> differing geometry. In fact FF sensors are more susceptible to edge >> performance issues due to digital sensors having issues with off-axis >> light. > > But obviously that issue is almost a non-issue now given the > appropriate design. Consider the M9 which contains a 36x24mm sensor > with a reduced sensor to mounting flange distance coupled with various > lenses which protrude into the body and still don't appreciably > vignette. > > -- > Rob Studdert (Digital Image Studio)
The M9 actually has serious issues with edge performance on wide-angles, primarily in colour shift caused by the filter pack on the front of the sensor. The use of offset microlenses migitates the off-axis sensitivity issue but doesn't eliminate it entirely. Leica has chosen to solve the remaining problems in software, which is why Lens Coding is essentially a requirement for lenses used on an M9. Of course the M9 has much greater challenges here than FF DSLR's due to the short distance between the rear element of RF wides and the sensor, which is typically 20-30mm lens than current DSLR design minimum distances. -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
