Archived posting to the Leica Users Group, 1998/06/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Before we get all crazy about digital cameras with an 11 stop range, some basic electronics is necessary... If you digitize the image with a CCD, using 12 bits for each of red, blue and green, you get a dynamic range of 1 part in 2 to the 12th or 12 stops or range. It does not mean the CCD could record that range or that the range itself is linear. It refers only to the electronics digitization sub-system. You can expect that this range is NORMAL for any decent digital camera. What I trying to say is that the data presented, while it may and probably is, perfectly accurate, tells you little to nothing about the ability to record light data. I have not seen any specs on the linearity of light to recorded vs. light reflected ny the subject. BTW, if you want an analogy to chemical film, ..... Velvia has an ASA of 50 Some Kodak emulsion has an ASA of 1600. This is a 5 stop range.... and I don't even have any light yet! Be watchful of marketing hype that is meaningless....OTOH, if you are a catalog shooter putting out 100 rolls a day, go for it! Everyone else will! Thank You Remove "ZZ" form auto reply address or please reply to address below: Frank Filippone red735i@worldnet.att.net