$24.99

Details

  • Released
  • Updated
  • March 10, 2012
  • August 31, 2023

Features

BTZS ExpoDev screenshot #1 for iPhone
BTZS ExpoDev screenshot #2 for iPhone
BTZS ExpoDev screenshot #3 for iPhone
BTZS ExpoDev screenshot #4 for iPhone
BTZS ExpoDev screenshot #5 for iPhone
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About

This app helps traditional film photographers accurately expose black and white film using custom film test data. It calculates precise exposures and development times in the field for consistent results and easier darkroom printing.

Exposure record keeping
Film Profile, lens, and filter management
Incident and Zone System metering support
Depth of Field calculator
Reciprocity failure adjustments
Integrated exposure timer
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What's New in BTZS ExpoDev

1.1.7

August 31, 2023

Fixes for Dark Mode UI

User reviews

Using as I write...

I trust this app when I shot which is generally 5 days per week. Exposures are 99% spot on as with development.
For the analog photographers this should be a must have app.
James M Locke
Alexandria, Va

Issues with this app

Be aware the app requires you purchase additional software that only works on PC. The sample files don’t work and support does not respond. How do I get a refund?

Response from developer

Sorry that you are having issues - we’d like to help. Please email support@tinyoctopus.net for app support.

Great, could be better

I used ExpoDev on a Palm, but it’s really nice to be able to use it on my iPhone and iPad.

Given how nice it is, it would be even nicer if Plotter were integrated into the app for use on an iPad. This would require a lot of work, but it would simplify things. If it were designed well, with integrated Plotter, it would be an excellent way for people to learn about BTZS(I know I’m dreaming.) I bet Phil would like such a creation. As it is now, even with a good film testing service available, I can imagine only BTZS veterans using it.

The input method for EV seems clumsy, I can’t help but feel scrolling is the way to go.

For Mac users: Plotter for Windows works great using Wineskin. No need for Windows.

All this being said, it is a great app that does what I need it to do. In this age of high priced film, it is worth learning BTZS, doing the film and paper tests and buying this app.
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BTZS Expo/Dev is a godsend

For those still interested in using a view camera, the BTZS Expo/Dev App is a great tool. It allows you to import film test data, which can be done with the help of Fred Newman at The View Camera Store in Fountain Hills, Arizona. Once the film data is imported into the app, your I-phone becomes a very accurate and simple to use calculator for exposure and development. It also calculates filter factors, bellows factor and adjusts the exposure for reciprocity failure. In addition, the app helps you set the desired depth of field and keeps a record of all pertinent data for each exposure in your I-phone. Further, the expo/dev screens prompt you so you don't forget to calculate for various factors which could throw the exposure calculation way off. In short, for the price of a lunch and a couple of days of film testing you can have perfect exposures every time. BTZS is a godsend and a no brainer for any serious large format photographer.
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Finally

Expo dev finally ported to iOS. This app is a fabulous tool for BTZS
users and zone system users alike. You will need your film data from the BTZS Plotter program or you can have the view camera store expose and test your developed film. My previous film data imported flawlessly into the program . If you are a large format photographer, don't leave home without it. I am thrilled with this program.
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Developer apps

FAQ

What is BTZS ExpoDev?

BTZS ExpoDev is a mobile application designed to assist traditional film photographers in accurately calculating black and white film exposures and development times. It requires custom film test data analyzed and exported by the BTZS Plotter for Windows application.

Can I use BTZS ExpoDev without BTZS Plotter for Windows?

No, this app cannot be used without having your own BTZS Film Profiles that have been analyzed and exported by the BTZS Plotter for Windows application. It is a companion app.

What metering methods does BTZS ExpoDev support?

BTZS ExpoDev supports both BTZS Incident metering and traditional Zone System metering methods, offering flexibility for different photographic workflows.

Does BTZS ExpoDev have a depth of field calculator?

Yes, it features a powerful Depth of Field calculator with selectable Circle of Confusion and supports three different DOF calculation modes. It also includes metric and imperial measurement options.

How does BTZS ExpoDev handle reciprocity failure?

The app provides sophisticated reciprocity failure adjustments for both exposure and development time. These adjustments are based on lab-produced data for over 90 film and developer combinations.

What is the price of BTZS ExpoDev?

BTZS ExpoDev is a paid application, priced at $24.99. This one-time purchase grants access to all its features.

What devices is BTZS ExpoDev compatible with?

BTZS ExpoDev is available for Apple iOS devices, specifically iPhones and iPods. It requires iOS 4+ and has an age rating of 4+.

How often is BTZS ExpoDev updated?

The latest version of BTZS ExpoDev is 1.1.7, which was last updated on August 31, 2023. Updates typically include bug fixes and feature enhancements.