The difference in detail between the 12 and 14-bit images is far from minimal.
Rick http://photo.net/photos/RickW ----- Original Message ----- From: David Parsons <[email protected]> To: Pentax-Discuss Mail List <[email protected]> Cc: Sent: Tuesday, May 22, 2012 10:17 PM Subject: Re: K-30 vs K-5 In practice the difference is minimal. http://www.earthboundlight.com/phototips/nikon-d300-d3-14-bit-versus-12-bit.html Bit depth does not equal stops of DR. On Tue, May 22, 2012 at 8:20 PM, Larry Colen <[email protected]> wrote: > > On May 22, 2012, at 3:43 PM, steve harley wrote: > >> on 2012-05-22 11:31 Rick Womer wrote >>> I think another big difference will be the 12 v. 14 bit/channel RAW--I >>> suspect those extra bits in the K-5 are where the great DR lives. >> >> that concerns me too, but somehow dxomark rates the dynamic range of the K >> 01 12.9 Evs vs 14.1 Evs for K-5 — just over a stop of difference rather than >> the two stops that the data path would support, but still a significant >> difference >> >> (it would seem odd that 12 bits can support almost 13 stops of dynamic >> range; i suspect that some sort of dynamic range compression is used, or >> that i don't understand dxomark's measurement system) > > > I think that it can measure 13 stops of dynamic range, but with only 12 bits > of resolution. In other words, the fewest photons it can sense is 100, but > anything between 100 and 200 (actually 300?) will read as 0x0001. The most > that it can read before clipping is 819200 photons, but it reads that os > 0x0FFF (4095). Meanwhile a 14 bit A/D with 13bits of dynamic range would > read 100 photons as 0x0002, and 819200 photons as 0x3FFF (16,383), or it > would have a resolution of 50 photos per bit of least resolution. > > > > -- > Larry Colen [email protected] sent from i4est > > > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- David Parsons Photography http://www.davidparsonsphoto.com Aloha Photographer Photoblog http://alohaphotog.blogspot.com/ -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
