I'd accept a slight fall-off in quality - say equivalent to the quality of
800 ISO, which is pretty good. But I take the point that if you lower the
native speed you will also lower the quality acvhievable at higher speeds,
and that is not a trade-off the majority would wish to make.
It would be nice if they made a chip that could have any sensitivity you
wanted (at best quality) just by regulating the working voltage.
John
On Sun, 12 Jun 2005 19:04:00 +0100, Paul Stenquist
<[EMAIL PROTECTED]> wrote:
Good point. I have no problem focusing manually with a 4XND, and my DA
16-45 autofocuses nicely with that filter as well. 200 is a good number
for native speed. It's about where most wold prefer to optimize quality.
On Jun 12, 2005, at 11:45 AM, Bruce Dayton wrote:
The real trick here is that there is a single native speed of the CCD.
If you lower it or raise it, you introduce noise/quality problems.
Minolta offers a 100 ISO setting for their D7D which uses the same
basic chip as the Pentax and Nikon. However, image quality is lower
at ISO 100 than 200, which is the native speed. Unlike film, which
gets better quality the slower you go, digital doesn't get any better
once you go below the native speed.
So I guess a follow on question would be - would you accept lower
quality for slower speed or prefer ND's and better quality? I suppose
it could always be an option. Perhaps the Minolta choice is a good
one.
-- Best regards,
Bruce
Sunday, June 12, 2005, 8:29:14 AM, you wrote:
SB> I'd agree with John here in terms of using a filter. Adding and
removing
SB> filters throughout a day of shooting can be a bit of a PITA, and
digi is
SB> supposed to make things easier for the photog. It would be great
to have a
SB> 50 ISO setting - even 100 would be an improvement. As I've said
about film,
SB> lower speeds means wider apertures and more creative opportunities.
SB> Shel
[Original Message]
From: John Forbes
As William said, why put a filter on a lens if you don't have to?
----- Original Message ----- From: "Paul Stenquist"
Subject: Re: *ist D discontinued ?
Why would you want ISO 50 sensitivity? At 200, noise is virtually
unnoticable, and ND filters can be used when slower shutter speeds
are
required.
I can understand it. I like limited DOF, but tossing an ND filter on
SB> can
really bugger up AF, and these things don't have the best viewfinders
for manual focus.
It's not high on my list of wants, but it would be nice to have.
William Robb
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