On 26 Dec 2005 at 17:52, Godfrey DiGiorgi wrote: > A large diameter lens mount and a short register leaves more space > for correcting elements at the rear of a lens unit, used to provide > greater telecentricity to the edges and corners of a large sensor. > Sensor technology may well come to make this less of an issue, with > sensors that can accept light at higher incident angles it may become > a non-issue, but today it is an issue with 24x36mm sensors and very > short focal length SLR lenses, causing light falloff, lower > resolution at the corners and edges, and móire artifacts.
Maybe but of all the ultra-wides that I have or have had old and new all have featured quite small rear element diameters relative to the lens mount diameter. Whilst I understand what you are suggesting to my mind unless some radical new designs appear I can't see a larger diameter mount being utilized as you suggest. I've really only had two lenses where the rear element looked cramped in the Pentax mount and they were the A*135/1.8 and A*85/1.4. In any case I'm keen to find out how the new high fill factor micro-lens free 9MP sensor (CYIHDSC9000AA) from Cypress Semiconductor Corporation (priced at a whopping US$90 a piece) fares with WA lenses in practice, should be interesting. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
