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calculation of the optimal diameter of the pinhole |

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calculation of the optimal focal length |

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calculation of the *f* number for a given combination of pinhole and focal length |

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calculation of the exposure factor for *f* 22 |

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calculation of the exposure times for a given *f* number of the pinhole camera |

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calculation of the extended exposure times due to reciprocity failure for the majority of commonly used films |

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saving exposure table as Microsoft Excel file or text file |

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calculation of the angle of view, with diagram |

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calculation of the magnification and size of the subject on light-sensitive material |

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calculation of the zone plate with optional number of zones |

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calculation of the *f* number for the zone plate |

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saving the zone plate in Adobe PDF format |

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conversion of millimetres to inches and back |