Lumens, to F Stop? at DVinfo.net

Stephen Eastwood · July 8th, 2007, 11:42 PM

Anyone know a general way to calculate the f stop of a given light if all you know is the Lumens at a given amount of feet/meters? given a steady speed and iso rating?

I am trying to determine the ratings of some constant light sources and many only have lumen, or lux.

Thanks.

Stephen Eastwood
http://www.Stephen Eastwood.com

Richard Andrewski · July 9th, 2007, 11:41 AM

Stephen,

Take a look at this and see if it's what you want:

http://www.answers.com/topic/foot-candle?cat=health

It's a great question though for sure.

July 8th, 2007, 11:42 PM	#1
Stephen Eastwood Major Player Join Date: Jun 2007 Location: Great Neck, NY Posts: 291	Lumens, to F Stop? Anyone know a general way to calculate the f stop of a given light if all you know is the Lumens at a given amount of feet/meters? given a steady speed and iso rating? I am trying to determine the ratings of some constant light sources and many only have lumen, or lux. Thanks. Stephen Eastwood http://www.Stephen Eastwood.com

July 9th, 2007, 11:41 AM	#2
Richard Andrewski Major Player Join Date: Jun 2006 Location: Shenzhen, China Posts: 781	Stephen, Take a look at this and see if it's what you want: http://www.answers.com/topic/foot-candle?cat=health It's a great question though for sure. __________________ Richard Andrewski - Cool Lights USA - RED #114 http://www.coollights.biz