Archived posting to the Leica Users Group, 2003/06/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Austin Does that presuppose that the R8/9 shutter has to be locked open when the digital back is in place, and the hardware of the sensor support protrudes forward of the focal plane? Jerry Austin Franklin wrote: > Hi Adam, > > > On 2003-06-25 darkroom@ix.netcom.com (Austin Franklin) > > thoughtfully wrote: > > I'd like to think of it that way ;-) > > > >I don't believe there will every be a full frame "back" for the > > R8/9. There > > >are physical limitations that make this not possible. > > > > > > > Could you explain for us what those are Austin? Does it have to > > do with the > > actual dimensions of the chip and its support circuitry? > > The physical sensor is one issue, and it has to fit at A particular > spot...AT the film plane. Not before, not after... The sensors have a lot > in front of and around them, Bayer pattern color filters, anti-aliasing > filters and an IR filter. This adds depth/thickness/width/height needed in > front of and around the sensor...and therefore the film gate has to be deep > enough, and wide/tall enough to support all this. > > The reason a reduced size sensor works is it fits IN the film gate. A full > frame sensor would most likely not. I think there is money to be made by a > savvy sensor manufacturer who makes a sensor that maximizes the available > area within the film gate...but they all seem to fall "short". The sensor > used in the R digital back is basically a half frame sensor! It's only > 17.6mm x 26.4mm...I believe. It's 456 sq mm, and 35mm film provides 864 sq > mm. > > Regards, > > Austin > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html