----- Original Message ----- From: "Willem-Jan Markerink" <[EMAIL PROTECTED]> Sent: Thursday, August 21, 2003 4:35 PM
> On 21 Aug 2003 at 7:47, Thys wrote: > > > ----- Original Message ----- > > From: "Willem-Jan Markerink" <[EMAIL PROTECTED]> > > > Not sure if any of the sites mentions it, but according to Robert > > > Scott's newsletter, the cause is the shorter back-focus (distance > > > between rear lens and film), which is easy to compromise if you use > > > a smaller mirror, which can be done only because of the smaller > > > chip- size. > > > > Does that mean that it produces a smaller image circle (like Nikon's > > DX) or will we see a new generation of EF-S compatible cameras with > > larger sensors (1.3x) in future? Maybe Canon is seperating its > > consumer grade and pro grade lenses completely now by making them > > mount incompatible - a bit worrying I should think.. > > They don't really have a choice if they want to sell to the low end > market too....remember this is a US$100(!) lens > The same spec's in the past had a price-tag 10x higher! > (and the Nikon lenses are much more expensive too) > > And once full-size chips come down in price (and up in quality, > including corners with wide-angles), this will prove a temporarily > solution anyway.... > Let them have their cash-cow....;)) > > Don't think there will be room for 1.6x models in the future, once > that happens (not if but when). And certainly not for a permanent > range of 1.3x camera's. W-J, I suspect that the sensor size is a dilemma for Canon. Please correct me if I'm wrong. IIRC, the smaller the coverage of a lens the greater the possible resolution. Remember the Disc cameras from Kodak? Fitted with a plastic moulded single element (aspheric?) lens capable of over 100 lppm. Also, Rodenstock and Schneider introduced "digital" lenses capable of considerably higher resolution than those designed to cover large format film. http://www.schneideroptics.com/photography/digital_photography/150/page5.php http://www.schneideroptics.com/photography/large_format_lenses/apo-symmar/pd f/apo-symmar_56_150.pdf The Canon A70 digicompact has a 3MP sensor of only 4mm x 5.3mm, it's lens must be capable of extreme resolution. It has been suggested that the lens is now the limiting factor in terms of detail resolution. http://www.uschold.com/pdf/Report%20SLR%20Public%2009.02%20N.pdf (Thank you, Roger) If this is the case, then packing in more pixels, may be of no benefit. Notwithstanding the fact that larger pixel sites generate less noise, having a smaller sensor with lenses optimised for that coverage may make more sense (Nikon and 4/3rds strategy?). So it appears to be a balancing act, in which Canon are still keeping the options open. CraigZ * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
