Cyanotype Exposure Times for today Monday 28/04/25

Please note that the times below are approximate for sunlight exposing between 10am & 4pm.
Sunny:     3m
Light cloud:     7m
Medium cloud:     30m

Sunny = Clear sky.
Light cloud = You can clearly see the sun’s position through the clouds.
Medium cloud = You can not see the sun’s position through the clouds, but the clouds are bright.
Heavy cloud = It is not possible to give a time for dark heavy winter clouds. It can be more than 1-2 hours.

Times are based on the conditions below:
Exposure time: Between 10am & 2pm.
Location: Central UK, exposure outside, clear view of sun’s position without obstruction.
Glass: No (Some glass will filter UV light and may need a longer exposure).
Coating: Classic Formula on paper (dried overnight).
These times are only a guide to help exposing with the sun, you may need to adjust exposure times to suit your setup. Always do a step test if you need more accurate timings.

Exposure app

New Cyanotype Exposure App

You Just point your phone screen at the sky to get an accurate exposure time in any weather. You can see more about the app at altxpo.co.uk

This app is only available for Android devices but will be available for Apple soon.

Real Exposures

November Bright Sun

Cyanotype exposure on a sunny day in November at noon UK using the app.

November Light Cloud

Cyanotype exposure on a light cloud day in November at noon UK using the app.

November Overcast

Cyanotype exposure on a cloudy day in November at noon UK using the app.

November Rain

Cyanotype exposure on a Rainy day in November at noon UK using the app.

November Snow

An exposure in winter snow through a single glazed window in November at noon UK using the app.

Mixed Sun & moving cloud (soon)

Demo of how the app works when the weather changes from sun to cloud and back repeatedly.

Related Tutorials

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