hi, f*f/t=E*18%*S/K/PI
'f' is Av, 't' is exposure time in second, E is lux, K is a constant, equals 15.4 in documents of Kodak. So, if E=500lux, S=ASA100, then f*f/t=500*0.18*100/15.4/3.14159=186, equals 1/6s,F5.6 or 1/90,F1.4 . �� 2002-06-04 23:06:00 ����� >Hi. > >Does anyone know if there is some reasonably simple formula to take a >regular meter reading (i.e. F4 @ 1/60) and convert it into lux? The Frontier >shouldn't be put in an area with more then 500 lux lighting, and where we >are putting it is pretty bright. If someone has a meter with lux and f-stops >and can give me a setting for 500 lux, that would work ok too. > >BUTCH > >"Each man had only one genuine vocation - to find the way to himself" >Hermann Hesse (Demian) >- >This message is from the Pentax-Discuss Mail List. To unsubscribe, >go to http://www.pdml.net and follow the directions. Don't forget to >visit the Pentax Users' Gallery at http://pug.komkon.org . �� �� Y.P.Wan [EMAIL PROTECTED] - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
