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#1 Ashim

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Posted 01 November 2006 - 09:19 AM

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.
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#2 Stephen Williams

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Posted 01 November 2006 - 09:30 AM

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
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#3 Ashim

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Posted 01 November 2006 - 10:10 AM

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
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#4 Stephen Williams

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Posted 01 November 2006 - 02:32 PM

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
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Visual Products

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Broadcast Solutions Inc

Paralinx LLC

Aerial Filmworks

The Slider

New Pro Video - New and Used Equipment

Ritter Battery

Wooden Camera

Rig Wheels Passport

Media Blackout - Custom Cables and AKS

Tai Audio

Abel Cine

Technodolly

Willys Widgets