Calculate the Exposure Time for Light Conditions & F Number (f stop)
 
Using the Paper Pinhole Calculator & Ilford Camera Obscura F Number calculation, determine the exposure time for the following light conditions and photography paper types

Photography Paper ISO:

Ilford Multigrade IV RC (from Obscura camera kit) – ISO 6

Ilford Harman Direct  - ISO 3

Arista RC EDU Graded #2 – ISO 6

Ilford Multigrade Matte Fiber – ISO 6

Indoors with lighting, using Arista RC EDU Graded #2
~8 hours
4 hours
7 hours
2 hours
10 hours
Sunlight with clouds, using Ilford Harman Direct
5 minutes
1 hour
3 minutes, 45 seconds
30 minutes
10 minutes, 15 seconds
Dense clouds, using Ilford Multigrade Matte Fiber
45 minutes
25 minutes
30 seconds
20 minutes
1 hour
Indoors with bright sunlight, using Ilford Multigrade IV RC
30 minutes
2 hours
2 hours, 15 minutes
1 hour, 45 minutes
50 minutes
Sunny light conditions, using Arista RC EDU Graded #2
45 seconds
1 minute, 25 seconds
5 minutes
8 minutes, 30 seconds
30 seconds
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