Exposure
Combination
with DSLR
EQUIVALENT EXPOSURE COMBINATION
ISO: 100*2^n
Aperture: sqrt((1/2)^n)
Shutter Speed: (1/2)^n
Equivalent on Exposure Value
Equivalent exposure combination
Accurate Exposure
ISO 100
f 1.8 + 1/500
= f 4 + 1/125
= f 8 + 1/40
Aperture
AP: Aperture Priority
Depth of Field
-
Aperture
-
Focal Length
-
Distance
Common Aperture Value
- Macro photography: 1:1, f11 ~ f1
- Creative shooting: Bokeh f/1.4 ~ f/2.8
- Sports: f/2.8
- Indoor portrait: Single f/2.8 ~ f/4, Multiple f/5.6 ~ f/8
- Outdoor portrait: f/2.0 ~ f/5.6
- Landscape photography: f/11 ~ f/22
ISO
-
CCD: Charge-coupled device
-
CMOS: Complementary metal–oxide–semiconductor
So = A (Si + n)
A <==> ISO
Dynamic Range
Film: EV ± 9
Digital: << EV 9
Linear Range of sensor
HDRI：High Dynamic Range Image
Multixposure + Image Merge
Sampling
sRGB, adobeRGB: 8 bit
RAW: 10 ~ 12 bit
NOISE
SNR = Si / n
n = n(light) + n(circuit)
Si ~ Luminous Intensity
n(light) ~ Luminous Intensity
n(circuit) ~ relatively constant
ISO amplifies the signal but doesn't improve SNR
Shutter Speed
SP/TP: Shutter Priority/Shutter Priority
Max Speed: Mechanical Restriction
Bulb: B Shutter
Noise
Accumulation Effect
Lo = [Ii + n(circuit)] * t
Ii = Iis + n(optical)
SNR = Iis / n
n = n(circuit) + n(optical)
t increase the light intensity but won't improve SNR
Two Limitation
Noise
Dynamic Range
Exposure Combination
By timnew
