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[title] Removal and refitting of the image sensor and infrared filter
[* black] The image sensor and infrared filter can be inspected or replaced without further disassembly of the lens. However, any dust or fingermarks may have a major impact on image quality and correct realignment on reassembly is critical. It should therefore preferably be left alone.
[* black] With a small craft knife, scrape away the locking glue from the 3 screws securing the image sensor plate to the back of the lens. Take care to remove any loose fragments of glue which might fall into the lens.
[* black] Note the initial positions of the heads of the 3 screws and remove them, counting the number of turns required for each. Remaining glue will make these stiff - take care not to burr the heads. Gently ease the image sensor away, keeping the lens face-down on the bench.
[* black] Put the sensor aside, safe from dust contamination, such as in a self-sealing polythene bag.
[* black] On reassembly it is important for accurate focussing that the 3 screws are each tightened by the same number of turns and to the same positions as before disassembly. apply screw locking compound to the heads to prevent movement.