Cyanotype exposure time app
With this app on your phone you can accurately measure the correct exposure time for cyanotypes in all weather conditions. Simply use the estimator or let the app control the exposure for you. The app will adjust its exposure on the fly if the weather changes. The app also has the option to pause and resume the exposure. This app gives you a clear advantage of size, quantity and uniformity over other methods of exposing, perfect for large format cyanotypes and large quantities of cyanotype prints.
Test exposures
There is only one setting on the app – Dose. Just do a few test exposures to find your preferred depth of blue . All test exposures below use the exact same Dose.
UK Winter Sun
Cyanotype exposure on a sunny winter day at noon UK using the app.
November Overcast
Cyanotype exposure on a cloudy 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 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.
Mixed sun & moving cloud
Demonstration of how the app works as the weather changes from sun to cloud and back.
What are Altxpo’s advantages over exposure lamps?
No size or quantity limit
Cyanotypes without limits. Much more versatile than a UV lamp.
No Hot spots
Perfectly even exposures.
Completely eliminates the hot spot problem that UV lamp exposures can suffer from.
Portable Exposure Meter
Use it anywhere. Nature walks, Field classes, Remote locations. No network connection needed.
Any conditions
Get perfect exposures in all weather.
Great for groups & classes
If you need to expose a large amount of cyanotypes just give the apps estimate time to your students and let them time their own pieces.
Works with Many UV based processes.
Cyanotype, Gum printing, Salt printing, Argyrotypes, Van Dyke (VanDyck) , Platinum/Palladium, Carbon , Kallitype , Albumen Printing, Screen printing or any process that can use Natural UV for exposure.
| Expose in all conditions | ||
| Thick cloud | Light cloud | Behind a window |
| North facing | Rainy | Partly cloudy |
Reviews
We are very grateful to all who took the time to send us some amazing artwork, real life usage and very useful feedback on the app.
Hi
I bought your app with pretty low expectations as I have tried others which proved to be worse than useless.
To my surprise I am BLOWN AWAY by Altxpo!
Altxpo has enabled me to produce cracking prints in changeable British weather. I’ve worked with it and altered exposure percentage, sometimes using up to 105% for dense contrasty negatives, at other times just 60%.
I’m an experienced cyanotype printer, using sun when possible and UV lamps during darker months. I’m pretty sure I’ll be using Altxpo nearly all the time from now on. I trust it!
My work can be seen on @catherineorrpictures (the more recent flower images were all done with Altxpo)
Best wishes
Catherine
It was wonderful to estimate the exposure time on sunny summer days, and as autumn is coming, I will appreciate it all the more so as uncertain whether makes it difficult to decide on the right exposure time.
Reviewer
Pre release app tester
The app is very useful and easy to use. It is great to have a good estimate time and the countdown counter is a good feature. I am looking forward to trying it in different weather conditions.
Reviewer
Pre release app tester
Tried this app doing cyanotype for the first time. It worked just as explained. I had an issue downloading it but Malcom provided a quick solution. Happy with the results!
Reviewer
Pre release app tester
The app is very useful and easy to use. It is great to have a good estimate time and the countdown counter is a good feature. I am looking forward to trying it in different weather conditions. Thank you for including me.
Reviewer
Pre release app tester
Really useful app for helping time Cyanotype exposure times. The British weather is so changeable this app helps to get repeatable results. Reported an issue with app layout when using large fonts and it’s been updated and now it works perfectly.
Reviewer
Pre release app tester
Very useful app.
Reviewer
Pre release app tester
The sun is by far the best light source for exposing cyanotypes and similar processes. Cyanotype exposure in natural light has always been challenging to achieve. In any weather conditions, any time of year the Altxpo app is designed to achieve results that are consistent and controllable.
You can decide the depth of the exposure and expose multiple cyanotypes to the same darkness level, even on different days and different weather conditions.
The consistent results add a uniform professional look to artwork in exhibitions or collections especially with larger pieces.
In a class environment an instructor providing the correct exposure time can have confidence that every students artwork will be a success.
| One time payment £5 No ads Yours to keep Full Support |
Download it Now
For UK cyanotype supplies we can recommend cyanotype.co.uk and solarart.co.uk