Re: ASTM E 1742-00 I believe they are attempting to illustrate the difference between the larger "low range " viewer and the smaller "high intensity" viewer. This is just a way to document and justify the maximum readable film density posted on each viewer. What I find interesting is the fact we can no longer measure the light intensity in foot candles. According to ASTM E 1742-05 we must now measure luminance in candelas/m squared. Again, the cost of NDT goes up. Yee Ha ----------- Start Original Message ----------- : Can anyone explain why the curve in Figure 2 (Maximum Allowable Film Density) isnt continous? There is a jump between density 2.5 and 3.0 why? : ------------ End Original Message ------------

Re: ASTM E 1742-00 Thank you for the answer Mr Kallhof. But what still makes me confused is the fact that if you now measure 10000 lux at the viewing port, can you post a 3.0 sticker on the viewer or is the maximum readable density just 2.5? ----------- Start Original Message ----------- : I believe they are attempting to illustrate the difference between the larger "low range " viewer and the smaller "high intensity" viewer. This is just a way to document and justify the maximum readable film density posted on each viewer. What I find interesting is the fact we can no longer measure the light intensity in foot candles. According to ASTM E 1742-05 we must now measure luminance in candelas/m squared. Again, the cost of NDT goes up. Yee Ha : : Can anyone explain why the curve in Figure 2 (Maximum Allowable Film Density) isnt continous? There is a jump between density 2.5 and 3.0 why? : : ------------ End Original Message ------------

Re: ASTM E 1742-00 Unfortunately I'm in the dark over this revision as much as yourself. I am waiting for a response from ASTM subcommittee E07.01 to my inquiry regarding the posting of "Maximum Allowable Film Density" and how to come up with a value.

----------- Start Original Message ----------- : Thank you for the answer Mr Kallhof. But what still makes me confused is the fact that if you now measure 10000 lux at the viewing port, can you post a 3.0 sticker on the viewer or is the maximum readable density just 2.5? : : I believe they are attempting to illustrate the difference between the larger "low range " viewer and the smaller "high intensity" viewer. This is just a way to document and justify the maximum readable film density posted on each viewer. What I find interesting is the fact we can no longer measure the light intensity in foot candles. According to ASTM E 1742-05 we must now measure luminance in candelas/m squared. Again, the cost of NDT goes up. Yee Ha : : : Can anyone explain why the curve in Figure 2 (Maximum Allowable Film Density) isnt continous? There is a jump between density 2.5 and 3.0 why? : : : ------------ End Original Message ------------