-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Robert Meier Sent: Monday, March 03, 2003 10:19 AM To: [EMAIL PROTECTED] Subject: RE: EOS Start a Rumor or Dialog
>-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of John Lovda >Every technology has its own set of obstacles to >overcome for increased performance. Some of the >previous comments had to do with the noise level >current sensors and the optical precision of the >lenses needed to provide a good image on a small >sensor. If there is a market, the technology will >follow. In 1990, a 486 processor had (I believe) just >under one million transistors and ran at 66mhz. >Twelve years later with the P-4, we are at 20-30 >million transistors at speeds of 3+ ghz on almost the >same size die. Craming more pixels on a CCD/CMOS (or in your example a processor) is not the real problem. Canon and others are already doing that. The biggest problem when doing this is noise. Decreasing pixel size decreases the number of detected and converted photons you can store. The less photons you can store the lower the dynamic range. For very small well sizes (at 'big' well sizes dark noise is more a problem) this is made even worse as the percentage of photon noise increases which further reduces the dynamic range. And while dark noise and read out noise can be reduced by better technology photon noise can not by the laws of quantum physics. This is one of several reasons why to stay with the 35mm format for DSLRs. It also becomes questionable what the new standard will be. Is Canon going to have lenses for full-frame (35mm) sensors, another line of lenses with a smaller image circle for sensor sizes with a 1.3x factor (which cannot be used for lower mag factors), another line of lenses for a 1.6x factor, etc? Robert Hi Robert, Technically you have it pretty much right, I too question what Canon or the other high-end DSLR maker, Nikon will do. I agree with your assessment of the lens situation and it pretty much pissed me off to see the initial direction (EOS D30), that it was going. BUT the EOS 1D was going the right direction and after seeing an EOS 1Ds (which is darned near perfect for me except for that pesky PRICE issue!), I'm getting happier about it. So I'll be stuck (LOL!), with my EOS D60 and will fork over some cash for an EOS 1D in a week or two after selling off some of my prized lenses EF 300 2.8L and EF 135 2L, and a couple of EOS 1n bodies, boosters and all that stuff that goes with them. The last straw was the prices of the EOS 1D being reduced so much as they have been in the last few weeks. So then I'll be sitting around waiting for the EOS 1Ds or something like it in the full frame 12MP range while I take lots of images and try to recover from the shock of loosing film and coming to grips with the "new" range of focal lengths I'll have from my remaining glass. It will be odd reaching for my EF 85 1.8USM instead of my EF 135 2L and the EF 50 1.4USM instead of the EF 85 1.8USM! Mass confusion is about to reign unless Canon manages to publicly state their plans as to the lens lines and where they expect to go with respect to lens mounts and sensor sizes. Cheers/Chip * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
