Please be aware that there is an error in the Apollo user manual that describes the option to manually record dark frames. This section is obsolete as the camera performs this procedure automatically without any user intervention. In fact, if the user does try to manually take dark frames, it can corrupt the calibration data leading to artefacts in the final image.
The team is working on updating this, but for any current Apollo camera owners/users please disregard section 22 of the manual (Dark Frames).
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Thank you.
The Apollo camera has fomented new research in art history and English literature
Ashmolean Museum, Oxford University