Minolta did that on the RD-175. Unfortunately the process causes the all lenses to have to be rated at F6.7 aperture or slower regardless of how fast they are. This is because not only does the lens have to change the light going to the chip but also to the viewfinder since it has to be done after the lens or with an alternate set of additional optics in the viewfinder. Also it requires the viewfinder be significantly farther back which then makes the camera considerably thicker. As a result of this everybody decided just to leave the chip alone so that the lenses could stay just as fast as normal and it could be built on a body not much larger than the film versions of the respective cameras. Kent Gittings
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of john.vanderaalst Sent: Sunday, October 28, 2001 9:16 AM To: [EMAIL PROTECTED] Subject: full frame on digital slrs Just a thought.... I understand that the Pentax full-frame digital camera is cancelled, probably because of problems with the chip. But everybody would want such a camera because existing optics - especially wide-angle - could be used at full capacity. I also understand that ANY digital SLR with removable lenses have annoying problems because after some time dust can accumulate on the ccd. So my question: isn't it theoretically and practically possible ( and maybe even not that complicated) to make a digital SLR with a smaller chip that is equipped permanently with a strong positive optic in front of the chip, so that every existing lens can still be used with the same angle of view ? So that a 50mm-lens would not cover the usual 24-36, but instead be projected on the size of the chip. The fixed positive optic would be a kind of inverted tele-converter, and, as it is fixed, would protect the ccd from dust. The distance between CCD and bayonet-flange would be different than the one on existing-pentaxes, but that wouldn't be a problem whatsover. Probably there's a design-flaw somewhere in the above, but I would like to know where it is.... - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
