Designing a Sensor

[J. C. O'Connell]

You can get neutral density filters for those rare cases
Where you want to use extremely wide f-stops.
I say rare because slr cameras have very fast shutter speeds for 
Daylight usage and any decent studio flash is going to
Have many power settings including very low ones. If & when you
Hit those limits though, the neutral densities can
Solve that problem for you.....
jco

-----Original Message-----
From: pdml-bounces at pdml.net [mailto:pdml-bounces at pdml.net] On Behalf Of
John Forbes
Sent: Wednesday, November 01, 2006 3:45 AM
To: Pentax-Discuss Mail List
Subject: Re: Designing a Sensor

On Wed, 01 Nov 2006 04:02:45 -0000, J. C. O'Connell <hifisapi at gate.net>

wrote:

> My guess would be the sensor "base" speed is the speed
> At which no extra light ( slower sensor speed ) will improve
> The image quality any signifigant amount. No sense in
> Going slower if it doesn't improve anything.

If you are shooting with studio flash, and can't turn it down low enough

to give you short DOF, then there is a very good reason to have lower
ISO,  
whether or not it improves the quality.

Same goes for bright daylight.  It's purely a theoretical concept in the

UK, but in  other countries one wishes one could reduce the light  
intensity at times.

John

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