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[* black] The image sensor 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 so it should 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] Remove the 3 screws. Renaining 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. Put the sensor aside, safe from dust contamination, such as in a self-sealing polythene bag.
+[* black] Remove the 3 screws. 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.