Collimation Aid
Download of Collimation Aid 1.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free Mac app was originally produced by ClearAndDark. The software relates to Design & Photo Tools.
From the developer:
Collimation Aid is a simple app whose only purpose is to display three concentric circles on a transparent window. This window can be overlaid on an image, particularly an image from a camera attached to a telescope. The size of the window can be adjusted as required, and so can the size, and relative sizes, of the circles (via the Setup menu). The colour (and so brightness) of the circles can also be adjusted in the same way.
You may want to check out more software for Mac, such as Credit-Aid Home Demo, Language Aid or AddressBook Aid, which might be related to Collimation Aid.
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