| Author | Message | ||
     Gez Tinkerer Username: Gez Post Number: 37 Registered: 09-2007 Rating: N/A |
Glenn, many thanks for your detailed instructions. Fortunately I didn't have to remove the focusing ring and having slept on the problem realised that the glue wasn't holding the optical cell in place, it just appeared to do so. The cell is sitting a 'funnel' as you describe, held in place by the filter ring, though a much tighter and precision fit than in the lightweight 50/1.8. On carefully removing the cell the iris assembly was visible and secured by 3 screws. I made a measurement of the aperture at f16, about 2mm., lifted the unit out and flush cleaned 4 times with lighter fluid without further disassembly. The trick on reassembly seems to require holding the blades open while securing the screws. All seems OK! perhaps beginners luck, anyway it has given me confidence to tackle some of Canon's heavyweights. Thanks again. |