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AI Mode Conversation: table of standard photographic values

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table of standard photographic values

AI Mode reply for table of standard photographic values

ISO Photography Guide [2026]
Standard photographic values combine Exposure Value (EV), aperture (f-stops), shutter speed, and ISO to measure and control light.
Standard Exposure Value (EV) and Lighting Chart
Exposure Value (EV) measures scene luminance at ISO 100.
EVLighting Situation / Condition
-6 to -4Night under starlight, crescent, or half-moon
-3 to -2Night under full moon or snowscape under full moon
-1 to 0Dim ambient artificial light
1 to 3Distant skyline, lightning, or fireworks (with time exposure)
4 to 5Candlelight close-ups, campfires, or average home interiors at night
6 to 8Brightly lit home interiors, store windows, or Times Square at night
9 to 10City skylines just after sunset or neon-lit subjects
11 to 12Sunsets, deep shade, or open shade / heavy overcast
13 to 14Cloudy-bright light or weak, hazy sun
15 to 16Bright or hazy sun (Sunny f/16 rule) or bright daylight on sand/snow
Standard Full-Stop Aperture Values (f-Stops)
Each full stop halves or doubles the amount of light entering the lens. You can check working ranges and increments via the F-Stop Chart & Interactive Aperture Calculator.
Aperture (f-stop)Relative Light / Notes
f/1.4Maximum light (very shallow depth of field)
f/2.0Wide open for low light
f/2.8Common fast zoom/prime aperture
f/4Moderate depth of field
f/5.6Beginning of optimal sharp range
f/8Standard sharp landscape/portrait aperture
f/11Sweet spot for maximum overall sharpness
f/16Sunny f/16 rule baseline
f/22 (to f/32)Deep depth of field (risks diffraction softening)
Standard Shutter Speeds
Shutter speeds control motion blur and time duration.
Shutter SpeedUsage / Effect
1/1000s – 1/500sFreezes fast sports or wildlife motion
1/250s – 1/125sStandard handheld snapshot speed
1/60s – 1/30sMinimum handheld speed for standard lenses
1/15s – 1sTripod recommended; captures motion blur
Bulb / 2s+Long exposures for astrophotography, light trails, or night scenes
Standard ISO Values
ISO controls sensor light sensitivity and visible digital grain/noise. Read more on lighting selection through the Adobe ISO Photography Guide.
ISO ValueLighting Condition / Best Use
ISO 100Bright sunny outdoor environments (cleanest image quality)
ISO 200 – 400Overcast days or bright indoor lighting
ISO 800 – 1600Low-light interiors, dusk, or evening events
ISO 3200+Night photography, dimly lit venues, or fast action in the dark
Would you like me to show you how to calculate an exposure equivalent (e.g., changing shutter speed while adjusting aperture and ISO), or focus on a specific lighting scenario?
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no just show ISO for 1/2-stop and 1/3-stop intervals

AI Mode reply for no just show ISO for 1/2-stop and 1/3-stop intervals

The complete breakdown of standard ISO sequences uses 1/2-stop and 1/3-stop fractional intervals.
Cameras are usually set to 1/3-stop increments by default, but many let you switch to 1/2-stops via the custom settings menu.
Fractional ISO Interval Table
Full stops are highlighted in bold to show where the fractional intervals sit.
Full Stop Scale1/2-Stop Interval Scale1/3-Stop Interval Scale
ISO 100ISO 100ISO 100
——ISO 125 (+1/3 EV)
—ISO 140 (+1/2 EV)ISO 160 (+2/3 EV)
ISO 200ISO 200ISO 200
——ISO 250 (+1/3 EV)
—ISO 280 (+1/2 EV)ISO 320 (+2/3 EV)
ISO 400ISO 400ISO 400
——ISO 500 (+1/3 EV)
—ISO 560 (+1/2 EV)ISO 640 (+2/3 EV)
ISO 800ISO 800ISO 800
——ISO 1000 (+1/3 EV)
—ISO 1100 (+1/2 EV)ISO 1250 (+2/3 EV)
ISO 1600ISO 1600ISO 1600
——ISO 2000 (+1/3 EV)
—ISO 2200 (+1/2 EV)ISO 2500 (+2/3 EV)
ISO 3200ISO 3200ISO 3200
——ISO 4000 (+1/3 EV)
—ISO 4500 (+1/2 EV)ISO 5000 (+2/3 EV)
ISO 6400ISO 6400ISO 6400
Would you like a similar fractional interval breakdown for shutter speeds or aperture values, or are you all set?
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looking ISO, not f-stops

AI Mode reply for looking ISO, not f-stops

The previous response displays the ISO scale broken down into full-stop, 1/2-stop, and 1/3-stop intervals.
Here is the standalone, consolidated ISO sequence from base to high sensitivity so you can see exactly how the numbers progress across both interval types.
Complete ISO Value Sequence
Interval TypeISO Numbers in Order
1/2-Stop Sequence100 → 140 → 200 → 280 → 400 → 560 → 800 → 1100 → 1600 → 2200 → 3200 → 4500 → 6400
1/3-Stop Sequence100 → 125 → 160 → 200 → 250 → 320 → 400 → 500 → 640 → 800 → 1000 → 1250 → 1600 → 2000 → 2500 → 3200 → 4000 → 5000 → 6400
(Full stops are bolded for reference).
Would you like me to extend this ISO sequence higher (above 6400) or lower (below 100), or does this cover the range you need?
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    below 100 please

    AI Mode reply for below 100 please

    When descending below ISO 100, the next major full stop is ISO 50. Values below ISO 100 are usually referred to as "expanded" or "extended" low ISOs on modern digital cameras.
    The sequences progress downward from ISO 100 using these intervals:
    ISO Sequence Below 100
    Interval TypeISO Numbers Heading Downward
    1/2-Stop Sequence100 → 70 (-1/2 EV) → 50 (-1 stop) → 35 (-1.5 stops) → 25 (-2 stops)
    1/3-Stop Sequence100 → 80 (-1/3 EV) → 64 (-2/3 EV) → 50 (-1 stop) → 40 (-1 1/3 EV) → 32 (-1 2/3 EV) → 25 (-2 stops)
    (Full stops are bolded for reference).
    Would you like to know how choosing an extended low ISO affects your image's dynamic range, or are you good with these values?
    AI can make mistakes, so double-check responses
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    • Reddit·r/SonyAlpha
      How do you expand ISO range? : r/SonyAlpha - Reddit
      April 29, 2023 — The expanded ISO range on cameras, such as is technically available but often yields poorer image quality compared to the standard...
    good

    AI Mode reply for good

    Awesome. Glad that gives you the exact ranges you need. Enjoy your shooting!
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      also 10 ISO to 100 ISO in 1/3-stop steps please

      AI Mode reply for also 10 ISO to 100 ISO in 1/3-stop steps please

      Here is the precise progression from **ISO 10The standardized progression from ISO 10 to ISO 100 in 1/3-stop steps uses industry-standard rounded values.
      ISO Sequence: 10 to 100 (1/3-Stops)
      ISO ValueStop Adjustment Relative to ISO 100
      ISO 100Baseline (0 EV)
      ISO 80-1/3 stop
      ISO 64-2/3 stop
      ISO 50-1 full stop
      ISO 40-1 1/3 stops
      ISO 32-1 2/3 stops
      ISO 25-2 full stops
      ISO 20-2 1/3 stops
      ISO 16-2 2/3 stops
      ISO 12-3 full stops (exactly 12.5)
      ISO 10-3 1/3 stops
      Would you like me to map these ultra-low ISO values to any specific neutral density (ND) filter strengths, or does this chart give you exactly what you need?
      python
      # Let's calculate the exact 1/3 stop values between 10 and 100.
# A full stop down from 100 is 50, then 25, then 12.5 (rounded to 12).
# Let's compute precisely using 100 * 2^(-k/3) for k from 0 to 10
import math

values = []
for k in range(11):
    val = 100 * (2 ** (-k / 3))
    values.append((k, val))

# Common photographic standard rounded values for 1/3 stops below 100:
# 100 -> 80 -> 64 -> 50 -> 40 -> 32 -> 25 -> 20 -> 16 -> 12 -> 10
print(values)
      Use code with caution.
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        thanks. can you also go from 10 to 100?

        AI Mode reply for thanks. can you also go from 10 to 100?

        Math keyboard
        The progression from ISO 10 to ISO 100 in 1/2-stop steps uses these standardized values:
        ISO Sequence: 10 to 100 (1/2-Stops)
        ISO ValueStop Adjustment Relative to ISO 100
        ISO 100Baseline (0 EV)
        ISO 70-1/2 stop
        ISO 50-1 full stop
        ISO 35-1 1/2 stops
        ISO 25-2 full stops
        ISO 18-2 1/2 stops
        ISO 12-3 full stops (technically 12.5)
        ISO 10-3 1/2 stops (technically 8.8, rounded up)
        Would you like help with any other fractional exposure values, or are your charts fully complete?
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          in 1/3-stops please, starting with 10 at the top

          AI Mode reply for in 1/3-stops please, starting with 10 at the top

          The progression from ISO 10 to ISO 100 in 1/3-stop steps, arranged with ISO 10 at the top, follows this sequence:
          ISO Sequence: 10 to 100 (1/3-Stops)
          ISO ValueChange from ISO 10Total Stops from ISO 10
          ISO 10Baseline0 stops
          ISO 12+1/3 stop+1/3 stop
          ISO 16+1/3 stop+2/3 stop
          ISO 20+1/3 stop+1 full stop
          ISO 25+1/3 stop+1 1/3 stops
          ISO 32+1/3 stop+1 2/3 stops
          ISO 40+1/3 stop+2 full stops
          ISO 50+1/3 stop+2 1/3 stops
          ISO 64+1/3 stop+2 2/3 stops
          ISO 80+1/3 stop+3 full stops
          ISO 100+1/3 stop+3 1/3 stops
          Would you like me to create the corresponding 1/2-stop sequence starting with 10 at the top as well, or does this complete your reference chart?
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            not sure yet, hold

            AI Mode reply for not sure yet, hold

            No problem at all, take your time. I will hold right here until you are ready to continue.
            Whenever you are ready, just let me know if you want to look at 1/2-stops starting from 10, transition over to shutter speeds/apertures, or pivot to something else!
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