EI/ISO values for video cameras

[Daniel Sheehy]

hi, I am a lighting camera operator for a production company in Suva (FIJI)

 

I was wondering if anyone had calculated or knew the equvalent EI or ISO values for either of these two Sony SP Betacam cameras (with a gain setting of 0db):

 

-DXC 637 with 6.8 x 12 fujinon wide zoom lens

-UVW 100 with x16 zoom lens (I think this one is a cannon lens)

 

I am aware that there is a way to calculate it, but at the moment my waveform monitor is out of action...

 

thanks in advance for any info..

 

daniel

[Laurent Andrieux]

the 637 is given for F 8 at 2000 lux that is about 400 ISO

the UVW 100 is given for F 11 at 2000 lux, wich is about 800 ISO

[Laurent Andrieux]

Sorry, wanted to edit, but too late...

 

 

The 637 reference I 've got is assuming an Hyper HAD sensor :

http://www.scubatech.com/637.htm

 

The UVW 100, a Power Had one :

 

http://betacam.palsite.com/uvw100feat.shtml

 

the rule is : N²/t = E.S/250, where N is the F stop, t the exposure time, E the required lumination (generally 2000 lux for the given carachteristics)

 

What you can also do if you have no waveform monitor, as a quick guide with a lightmeter :

 

- have a properly set monitor,

- frame an average scene with no peak of light, nor large dark areas, incident light being the same on the whole set ; no backlight.

- press the momentary auto iris button

- check the given stop by the auto iris system

- measure the incident light of the scene, whatever sensitivity you compute, but set the proper exposure speed

- search while changing the sensitivity setting wich sensitivity gives you the same stop as the camera has given

- a difference of a third of a stop or less is acceptable

[Daniel Sheehy]

Yes the sensors are as you described.

 

thanks again for the info.