Designing a Sensor

[John Forbes]

Yes, I accept that you can use ND filters, and I accept that good studio  
flashes can be turned down very low.  However, mine were bought on the  
cheap, and don't go low enough, and I'd rather be able to control  
sensitivity by adjusting ISO than by adding filters.

The fact is that I seldom use higher ISO than 200 or 400, and never 3200.   
So for me, lower ISO would be better.

John

On Wed, 01 Nov 2006 09:02:51 -0000, J. C. O'Connell <hifisapi at gate.net>  
wrote:

> 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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