Sensitivity

[Ashim]

I have been reading manuals of various digital cameras and one point where I come to a grinding hault is when the Sensitivity is mentioned.

For instance, f/11 @ 2000 lux (3200K, 89.9% reflectance)

 

Now why are digital cameras rated in this manner and why is 89.9% reflectance mentioned, is it bec. digital sensors are rated according to white card or what??? Kindlu help me figure this out.

 

I have posted this query earlier in other forums but unfortunately got no response from the community.

I am sanguine abt success this time.

 

Thank You.

[Stephen Williams]

I have been reading manuals of various digital cameras and one point where I come to a grinding hault is when the Sensitivity is mentioned.

For instance, f/11 @ 2000 lux (3200K, 89.9% reflectance)

 

Now why are digital cameras rated in this manner and why is 89.9% reflectance mentioned, is it bec. digital sensors are rated according to white card or what??? Kindlu help me figure this out.

 

I have posted this query earlier in other forums but unfortunately got no response from the community.

I am sanguine abt success this time.

 

Thank You.

 

Hi,

 

So the camera seems 2 stops faster than it is! LOL

 

Video cameras were painfully slow 30 years ago. f2 @2000 lux!

 

Stephen

[Ashim]

But Stephen,

 

What I wanna know is what is the reason for calibrating them at 89.9% reflectance and why can it not be graded like film at 18% gray?

 

And what do u mean by they are two stops faster?

 

Thanx

[Stephen Williams]

But Stephen,

 

What I wanna know is what is the reason for calibrating them at 89.9% reflectance and why can it not be graded like film at 18% gray?

 

And what do u mean by they are two stops faster?

 

Thanx

 

 

Hi,

 

Spot meter reading on 18% grey F4 on 89.9% would be F8+!

 

30 years ago 2000 lux 18% grey would have been F1.00 or faster.

 

8000 lux 18% grey F2 does not sound that cool!

 

Stephen