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Select image sensor

A project log for A Spring-Drive Digital Movie Camera

Digitize a vintage spring-drive 8mm camera. Not for the sake of convenience, but for the enjoyment of video recording.

Select the image sensor to be used in the project. The image sensor must be placed just behind the shutter, but must be a small sensor board due to the limited size of the film chamber.
The maximum width of the space for the sensor should be 20 mm, and less than 15 mm is desirable for optical axis placement.
We originally planned to use a Raspberry Pi Camera V2, but the width of the board is 25 mm and it would not fit.

Therefore, we decided to use Arducam's OV5647 camera board with image sensor.

The width of the sensor part is as small as 8.5 mm, which seems to allow free placement in the film chamber.

The sensor size is 3.68 mm x 2.76 mm; the image size recorded on double-8 film is 4.37 mm x 3.28 mm, so the angle of view drops to about 84%, but this is within acceptable limits.

In actual testing, the Raspberry Pi Camera was able to transfer data at 90 fps at 800 x 600 size, although the image quality was not as good as the IMX219 Raspberry Pi Camera. In this project, we plan to synchronize the shutter timing and shoot at a maximum of 64 fps, so we believe we have confirmed that the performance is sufficient to handle this.

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