f10@2000 lux at DVinfo.net

Robert Bec · September 8th, 2007, 01:46 AM

Hi

Can someone please explain what they mean by f10@2000 lux for the EX1

My current camera's lux is .o4lux jvc 5001E so they say

How can i tell the rating of my camera

I usually just know how to shoot and have never taken notice of the numbers on the lens before

I use a canon lens.

Also what is overcranking i see that word mentioned quite a bit.

Regards

Robert

Guy Barwood · September 8th, 2007, 02:26 AM

The theory is that given a set amount of light (in this case 2000 lux), to expose a predefined image in a specific way the iris will need to be set at a specific setting, depending on the sensitivity of the sensor.

The more sensitive the sensor, the less open (higher the f-stop) the lens needs to be.

As has been said before, it is not the be it and end all of senstivity ratings but I think it is a reasonable guide.

The min lux ratings of cameras is usually something that a camera can do while producing the worst possible quality image. Every bit of gain and slow shutter is turned on. This rating is next to useless.

Overcranking is just shooting at a frame rate (frames per second) faster than you are planning on playing back at.

Simon Wyndham · September 8th, 2007, 04:24 AM

If you push the camera to its minimum lumination capabilities, then yes, the figures are meaningless. However I still think the figures are useful for showing how a camera will perform in various awkward lighting conditions. Just because it would be pointless to use the camera at very low levels, the figures are proportional to the situation. So a camera rated at f10 for example will perform a lot better in dingy churches for weddings than a camera rated at f7 etc.

September 8th, 2007, 01:46 AM	#1
Robert Bec Major Player Join Date: Aug 2007 Location: Sydney Australia Posts: 358	f10@2000 lux Hi Can someone please explain what they mean by f10@2000 lux for the EX1 My current camera's lux is .o4lux jvc 5001E so they say How can i tell the rating of my camera I usually just know how to shoot and have never taken notice of the numbers on the lens before I use a canon lens. Also what is overcranking i see that word mentioned quite a bit. Regards Robert

September 8th, 2007, 02:26 AM	#2
Guy Barwood Major Player Join Date: Mar 2005 Posts: 423	The theory is that given a set amount of light (in this case 2000 lux), to expose a predefined image in a specific way the iris will need to be set at a specific setting, depending on the sensitivity of the sensor. The more sensitive the sensor, the less open (higher the f-stop) the lens needs to be. As has been said before, it is not the be it and end all of senstivity ratings but I think it is a reasonable guide. The min lux ratings of cameras is usually something that a camera can do while producing the worst possible quality image. Every bit of gain and slow shutter is turned on. This rating is next to useless. Overcranking is just shooting at a frame rate (frames per second) faster than you are planning on playing back at.

September 8th, 2007, 04:24 AM	#3
Simon Wyndham Trustee Join Date: Dec 2003 Location: Malvern UK Posts: 1,931	If you push the camera to its minimum lumination capabilities, then yes, the figures are meaningless. However I still think the figures are useful for showing how a camera will perform in various awkward lighting conditions. Just because it would be pointless to use the camera at very low levels, the figures are proportional to the situation. So a camera rated at f10 for example will perform a lot better in dingy churches for weddings than a camera rated at f7 etc.