This section restricted to Duclos Staff users.

Service Manual: Disassembly/Re-assembly

Full CLA: 4-6 hrs.
This particular lens can be very finicky to get the focus feeling good due to the floating group system, so quote on the higher end.
re-collimate: 1 hr
remove focus gear (if any), rubber focus grip and loosen screws and shift focus ring to achieve collimation (assuming the pinch ring hasn't been glued down). Make sure screws have good hold on pinch ring underneath. If not, will need to disassemble front section to access focus mechanism.
Polish and re-coat Front Element: 1 hr. + P+C cost
1 hour in house labor for removal and installation. Front element does remove from housing.
clean Iris Blades: 4-5 hrs + 1 hr
speedbooster mod (not offered):
we do not offer rear mod for speedbooster clearance especially for mirror in Canon 5D
Centering adjustment: 2-3 hrs.
1. Take the floating group out. From the rear, remove the first two elements you see (indicating their orientation as you go).The first is the visible concave element, and the second is the plano-convex element below it. The revealed element below those is the one you need to spin.
Coupling: $50 (unless additional dis-assembly is needed)
see Leica-R Non-destructive Iris Coupling Guide for non-destructive and reversible procedure.
…end of Staff section

This section restricted to Duclos Staff users.

Focus Ring O.D.:
Zoom Ring O.D.: N/A
Iris Ring O.D.: -
De-click Y/N: Ye s
Iris Coupling: Yes, $50
remove mount, iris scale and inner iris linkage ring to access and cut wire. does not need CLA
see Leica-R Non-destructive Iris Coupling Guide for non-destructive and reversible procedure.
Additional Notes:
…end of Staff section