# Crystran Optics Guide — Optical Material Selection

> Optical Material Selection (iPhone/iPad app by Michael Weston.)

- Source: https://appshunter.io/ios/app/crystran-optics-guide/id1527497029 (this page in markdown: same URL + `.md`)
- Developer: [Michael Weston](https://appshunter.io/developer/1512664122)
- Category: Reference, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 12.2 · 81 MB
- Released: 2020-12-10
- Data updated: 2026-08-05
- User reviews in markdown: https://appshunter.io/ios/app/crystran-optics-guide/id1527497029/reviews.md

## What is Crystran Optics Guide?

The Crystran Optics Guide has been developed to enable Optical Engineers, Students, Researchers and anyone who has an interest in Photonics to make the correct material choice for IR/UV/VIS wavelengths when designing windows, lenses, prisms, filters and beamsplitters.  The calculator within the App provides quick, accurate and accessible information.


TRANSMISSION

An interactive table covering all wavelengths. Touch the screen on the material of interest to view the transmission graph.  For further information about the material the data sheet can also be accessed, which will give additional details about any properties that may need to be taken into account, for example, hygroscopicity.


REFLECTION

The reflection loss for one and two faces of any given material can be calculated with the input of just a few details. Options to select any material, wavelength and angle of incidence combination quickly deliver the percentage reflection per surface along with Brewster Angle and Critical Angle.

ELASTIC LIMIT


Calculates the optimum thickness required for an optical window used in vacuum or pressure applications. Select material, pressure differential (in any of the most common units), shape of window and diameter to find the thickness required, with a safety factor included.


## Version history (last 5 releases)

### 1.08 — 2026-07-30

Bug Fixes

### 1.06 — 2026-07-08

Latest version with some minor bug fixes

### 1.03 — 2025-03-12

Trying to restore the app to initially Testflight then back into the store.  This version has been compiled in the latest .Net Maui

### 1.02 — 2020-12-16

Wording change on About screen

### 1.01 — 2020-12-10

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-05.*