Question about Nikon and reviews

Archived from groups: rec.photo.digital.slr-systems (More info?)

RichA wrote:

> Some reviewers criticize the Nikon's for not having a
> 100 ISO setting, they start at 200. This is supposedly
> because Nikon sensors in the cameras that feature this
> are more sensitive so that a Nikon at f4 and 1/250 of a
> second has an ISO of 200 while another camera will be at
> 100. Is this true? IF so, there should be less noise and
> more dynamic range in the Nikon set at 200 ISO than another
> DSLR set at 200 ISO.

ISO is constant*standard_effect/necessary_exposure, and this is
directly tied to the signal-to-noise ratio.

www.google.com: ISO 12232

http://www.kodak.com/global/plugins/acrobat/en/digital/...

Yer a shithead FUDster, RichA, and you don't even know it.

Archived from groups: rec.photo.digital.slr-systems (More info?)

In article <jvt9h1hh7fcqb5n5mfjqia4il4nus82e1s@4ax.com>, none@none.com
says...
> Is this true?

No.

Nothing you say/hear/think is ever true. You're a hack troll.
--
http://www.pbase.com/bcbaird

Archived from groups: rec.photo.digital.slr-systems (More info?)

In message <jvt9h1hh7fcqb5n5mfjqia4il4nus82e1s@4ax.com>,
RichA <none@none.com> wrote:

>Some reviewers criticize the Nikon's for not having a
>100 ISO setting, they start at 200. This is supposedly
>because Nikon sensors in the cameras that feature this
>are more sensitive so that a Nikon at f4 and 1/250 of a
>second has an ISO of 200 while another camera will be at
>100. Is this true? IF so, there should be less noise and
>more dynamic range in the Nikon set at 200 ISO than another
>DSLR set at 200 ISO.

Take the same shot with the same lens; a t-mount with manual aperture,
mounted on a tripod (in non-changing lighting), set multiple cameras to
"ISO 200" with he same shutter speed, and fire away!
--

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John P Sheehy <JPS@no.komm>
><<> <>>< <>>< ><<> <>>< ><<> ><<> <>><

Archived from groups: rec.photo.digital.slr-systems (More info?)

In message <1125449818.226770.111020@g43g2000cwa.googlegroups.com>,
"eawckyegcy@yahoo.com" <eawckyegcy@yahoo.com> wrote:

>RichA wrote:
>
>> Some reviewers criticize the Nikon's for not having a
>> 100 ISO setting, they start at 200. This is supposedly
>> because Nikon sensors in the cameras that feature this
>> are more sensitive so that a Nikon at f4 and 1/250 of a
>> second has an ISO of 200 while another camera will be at
>> 100. Is this true? IF so, there should be less noise and
>> more dynamic range in the Nikon set at 200 ISO than another
>> DSLR set at 200 ISO.
>
>ISO is constant*standard_effect/necessary_exposure, and this is
>directly tied to the signal-to-noise ratio.

Funny; my 10D has lower RAW values with the same subject, lens,
aperture, and shutter speed than my 20D, and has a bell-curve of noise
3x as wide at "ISO 800", giving a S/N ratio about 4x as high for the 20D
at the same ISO. ISO 100 has a slightly narrower bell-curve of noise on
the 10D.
--

<>>< ><<> ><<> <>>< ><<> <>>< <>>< ><<>
John P Sheehy <JPS@no.komm>
><<> <>>< <>>< ><<> <>>< ><<> ><<> <>><