Posted: Thu Aug 01, 2013 4:29 pm Post subject: CZJ MC Biometar f2,8 120mm: Cleaning stuck aperture guide |
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Gonzoo wrote:
1. Unscrew 4 screws near the mount and lift off the mount.
2. Remove spacer ring (black side pointing up).
3. Unscrew rear lens block by hand (or spanner).
4. Remove 3 screws located on the inside.
5. Lift off the rear lens barrel.
6. Use Isopropanol or the like to dilute dryed lubricant on the iris blades.
7. Actuate the aperture lever to open/close the iris for cleaning until aperture ring works again.
8. Reassemble in reverse order.
Take extra care with the little springs in the aperture coupling mechanism.
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