Archived posting to the Leica Users Group, 2003/12/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]According to Sinar literature,their coold backs have a dynamic range of 14 stops. oops simon j - ----- Original Message ----- From: "Mark Rabiner" <mark@rabinergroup.com> To: <leica-users@mejac.palo-alto.ca.us> Sent: Friday, December 05, 2003 2:54 PM Subject: Re: [Leica] 35mm color vs. the tyranny of the masses > Dante Stella wrote: > > > > On Dec 5, 2003, at 2:37 AM, Eric Welch wrote: > > > > > Here's one inaccuracy in your text: > > > > > > > > > "-- Film has a much higher dynamic range than digital - 15 stops on > > > TMY, or a 32768:1 ratio. That means that you capture everything in the > > > scene and can go back and adjust up or down at will later." > > > > > > Not true. Film - even black and white, does NOT contain all details in > > > a scene. Even ideally processed, it will not be able to cover the > > > dynamic range of many, many scenes, especially contrast daylight. > > > Neither can digital. But that's my point. Neither of them can, and > > > film is not better. > > > > > > I'm trying to think of a definition of the term "dynamic" that would > make the statement that film has a "dynamic range" of 15 stops make any > sense. I looked it up in several sources on the internet as well. The > one definition I can think of is "in your wildest dreams" which can be > found in the "Rabiner Pronouncing Dictionary of the English language". > > There are ten stops or "zones" in the zone system. Eleven if you count > zone 0 which is film base fog and exists only in the neg not in the > print. (Big deal) > So I'm curious where they pulled they extra 4 stops out of!?! > > If they are using the term "dynamic" as "useful" which is a stretch then > film only has about 4 or 5 stops which contain detail. And are thus > "dynamic"? > "Jumps right OUT at you!" > The detail I get just kind of sits there but nevermind. > > And why they picked a thinner emulsion film like T-Max 100 to have that? > A thicker emulsion 400 speed film would more likely be able to have a > wider range and perhaps with special developing agents like Pyrocatechin > to make developers designed for recording sun spots and atomic bomb > blasts and severely lower the speed of your film. Not so useful in > obtaining normal looking results in a typical scene. Mud I say! Mud! No separation. > (Or getting something resembling "normal" results from Tech Pan which is > really a high contrast film, ultra thin emulsion) > No only 4 or 5 of the 10 or 11 stops you'd get in black and white film > have any real interest. > A few less in ColorNeg. > And a few stops less than that in color slide. Which hasn't left you > with much. > > Mark Rabiner > Portland, Oregon USA > http://www.rabinergroup.com > > No Archive > Hold the Anchovies > -- > 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