06-15-2012, 11:07 AM
Hi Reinier,
The most likely cause of problems like these is sticky aperture blades caused by the oil that is used to grease the moving parts in the lens. It does happen with older lenses.
Provided it is easy to reach the diaphragm, without having to remove too many parts, this should be a fairly inexpensive repair (cleaning the aperture blades). However, this does indeed depend on the complexity of the lens assembly. It it takes an hour to do the complete repair, it is worthwhile doing, if it takes a day, it isn't.
Kind regards, Wim
The most likely cause of problems like these is sticky aperture blades caused by the oil that is used to grease the moving parts in the lens. It does happen with older lenses.
Provided it is easy to reach the diaphragm, without having to remove too many parts, this should be a fairly inexpensive repair (cleaning the aperture blades). However, this does indeed depend on the complexity of the lens assembly. It it takes an hour to do the complete repair, it is worthwhile doing, if it takes a day, it isn't.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....