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Nikon D40 vs D40x ISO newbie question



 
 
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Old April 28th 07, 07:43 AM posted to rec.photo.digital,rec.photo.digital.slr-systems
C J Campbell
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Default Nikon D40 vs D40x ISO newbie question

On 2007-04-27 22:19:55 -0700, "Private" said:

From KR review of D40x
http://www.kenrockwell.com/nikon/d40x.htm
ISO 100 - 3,200. Per the laws of physics, a 10MP sensor has to run at lower
ISOs for the same performance as a 6MP sensor of the same physical size.
Therefore the D40x' ISO range starts at ISO 100, not ISO 200 as the D40. The
"wider range of ISOs" touted as a feature is actually a downgrade: the D40
didn't need to go slower than ISO 200 for great results, and at ISO 100 the
D40x is more likely to have more blur or shallower depth of field.
Please excuse my ignorance, and explain this law of physics.


Of course ISO 100 will have more blur or shallower depth of field, but
it has nothing to do with the number of pixels. It is just that
reducing the ISO requires a slower shutter speed or wider aperture.
This would be true of any camera.

Ken is making a few assumptions, one being that a smaller pixel does
not gather as many photons and therefore it is likely to generate more
noise. We see that in point and shoots, but it is an open question
whether the much larger sensors in SLRs have even begun to approach
that limit. Following Ken's reasoning the Canon 1D Mark II would have
terrible pictures, which is obviously not the case.

The ISO 100 is mostly there because Nikon users griped about having
only ISO 200. Sometimes you want blur or shallow depth of field.
Personally, I would like to see an ISO 24 setting. It would sure beat
using neutral density filters to slow down the shutter speed.


"a 10MP sensor has to run at lower ISOs for the same performance as a 6MP
sensor of the same physical size. "

and do you agree with KR's statement above?

TIA



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