








TTArtisans 90mm 1.25 oily aperture blades
Got this 90mm 1.25 in a bargain trade a while back. Traded away a 7A 50mm 1.1 that I wasn’t really using.
Looked clean until I noticed grease creeping into the aperture blades after sitting in my display cabinet for a few months.
Opened it up and found an absolutely stupid amount of helicoid grease everywhere. Whoever serviced this thing really went for it. Either that or he applies the same philosophy to drinking alcohol.
So I took it down to the blades, cleaned/degreased everything, and put it back together with a more reasonable amount of grease.
Haven’t even properly shot with it yet, I just need to find time to take pictures instead of taking cameras apart.
Disassembly notes:
- There’s 2 the rear elements accessible from the back held by a lock ring, observe orientation
- The helicoid is accessible from the rear mount/body and must be separated from the focusing barrel & mid-body. Take note or mark where you start unscrewing and where the helicoid separates.
- The front lens group is held by the nameplate ring and comes off as 1 assembly. The ball bearing and spring for the aperture detents is located just under the aperture marker and will fly off when the front housing is removed.
- Aperture front plate/blades is held on by a c-clip and aperture lever.