View of 4d wheel (4 x 1.25" filter plus (d) dark frame (optionally (v) visual diagonal mirror in Wide version). Note the Nylon gear used in all motorised wheels, and the pin-holes around the edge for the photo-electric positionings system. The double pin-hole is always at the '8 'o clock' position when filter number one is at the top, when viewed from the gear side of the wheel, which is the same side to insert filters.
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