ISO on D90


Jul 22, 2008
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#1
On the D90 ISO setting, can I assume that
L1.0 = ISO 50
L0.7 = ISO 100
L0.3 = ISO 150
 

Numnumball

Senior Member
Mar 6, 2009
13,899
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Central
#2
On the D90 ISO setting, can I assume that
L1.0 = ISO 50
L0.7 = ISO 100
L0.3 = ISO 150
Nope friend.. Nikon don't have ISO 50..

Nikon chooses to declare their main ISO range, 200 to 3200 in the D90's case, and then offer one more stop on each end as an extended range that they call Lo.

200 is the base ISO here..

L0.3 minus 0.3 of a stop from base, and L0.7 minus 2/3 of a stop, L1.0 one ful stop

HTH :)
 

Blur Shadow

Senior Member
Sep 17, 2005
4,886
4
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#3
Here are the approximate values:

L0.3 - ISO 160
L0.7 - ISO 125
L1.0 - ISO 100
 

Jul 22, 2008
231
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#4
Thanks for the kind clarification.
So will it be good to shot in L1.0 (~ISO100) whenever possible? Becasue low ISO yells less noise.
 

May 5, 2009
480
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#5
Thanks for the kind clarification.
So will it be good to shot in L1.0 (~ISO100) whenever possible? Becasue low ISO yells less noise.
do not use L1.0 on your D90, the dynamic range at the highlight end will be reduced by about 1 stop, so the photo you get with L1.0 ISO is essentially the same as an iso 200 photo overexposed by one stop in post processing, so the lowest ever iso i will go on a D90 is iso200, that extra one stop is not going to make any significant difference anyway.

refer to dpreview HERE for more details, scroll to "ISO sensitivity and dynamic range".
 

#7
Nope friend.. Nikon don't have ISO 50..

Nikon chooses to declare their main ISO range, 200 to 3200 in the D90's case, and then offer one more stop on each end as an extended range that they call Lo.

200 is the base ISO here..

L0.3 minus 0.3 of a stop from base, and L0.7 minus 2/3 of a stop, L1.0 one ful stop

HTH :)
true. i'd prefer to stay at 200 most of the times as the lowest setting for majority of my shots. thanks for the details brian:)
 

Blur Shadow

Senior Member
Sep 17, 2005
4,886
4
0
#8
Just stick to the base ISO for best results yeah.
 

Jul 22, 2008
231
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#10
But then if consider sunny 16 I will face a problem.
Example on a sunny day with sharp edge shadow.

M mode set to f16 1/250 iso200 as in sunny 16, if i want more DOF than have to set f16 to f2.8. That is 5 stop down, therefore, my exposure will have to up 5 steps. Problem is 1/250 up 5 steps will get 1/8000. And my little experience tells me that is it way off, because when I shoot outdoor portrait my setting range from f2.8 1/250-1/800 iso200. So how can I use 1/8000 ( not to mention my D90 dont even have 1/8000)

Am I missing something from sunny 16 or I mis-understand some fundermental knowledge?
 

May 5, 2009
480
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16
#11
But then if consider sunny 16 I will face a problem.
Example on a sunny day with sharp edge shadow.

M mode set to f16 1/250 iso200 as in sunny 16, if i want more DOF than have to set f16 to f2.8. That is 5 stop down, therefore, my exposure will have to up 5 steps. Problem is 1/250 up 5 steps will get 1/8000. And my little experience tells me that is it way off, because when I shoot outdoor portrait my setting range from f2.8 1/250-1/800 iso200. So how can I use 1/8000 ( not to mention my D90 dont even have 1/8000)

Am I missing something from sunny 16 or I mis-understand some fundermental knowledge?
correction here, when u set aperture from f16 to f2.8, you will have less DOF, i.e. the area in focus will be shallower.

i dun understand here, what is wrong with using 1/8000(let's assume D90 have it)? and why is there a fixed setting range(f2.8 1/250-1/800 iso200)? unless you are using flash, the shutter speed of 1/200 and 1/8000 doesn't really matter for portrait shoot, unless your subject is moving faster than 1/200 and slower than 1/8000 and you wan to capture the motion blur. :think::think:

anyway, if you really need to shoot at F2.8, and after setting your iso to base iso (200 for D90), and max your shutter speed liao (in D90 case 1/4000), you still get overexposed photo, then no choice, you have to use ND filter, how many stops ND depends on how many stops of lights you need to cut.

in this particular case, you will need ISO 200, F2.8 and 1/8000 to get proper exposure, but D90 only have 1/4000, so you need a ND filter that can cut at least 1 stop of light, or corresponding stops of ND filter that can cut the light to get the shutter speed you want/need.

HTH ;)
 

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