Helicoid grease
18 posts tagged Helicoid grease. Search within these →
Mamiya 6 75mm and 50mm Lenses: Stiff Focus from Hardened Grease
A common request that I get is for service to the Mamiya 6 75mm and 50mm lenses with stiff focus. For some reason, these two lenses are the ones that get…
Mamiya 645 80mm f/2.8: Sticking Diaphragm from Oily Blades
This Mamiya 80mm f/2.8 lens arrived with a sticking diaphragm. As seen in the photos, lots of oil present on the diaphragm blades. And, a lot of grease on…
Mamiya 645 80mm f/1.9: Focus Helicals Separated, Over-Lubrication
Another Mamiya 80mm f/1.9 645 lens that has come apart from the focus helicals. This is quite common as the grease sublimates and causes the focus to…
Mamiya Press 50mm f/6.3: Stiff Focus Helical Cleaning
This 50mm f/6.3 (Biogon type) is the widest lens made for the Mamiya Press cameras. This example came into the shop with a very common issue of stuck/tight…
Mamiya 645 80mm f/1.9: Stiff Focus and Focus Ring Setscrews
This has been a week of servicing Mamiya 645 80mm f/1.9 lenses. Most common issue is stiff focus and this is caused by dried or sublimated focus helical…
Mamiya 7 80mm Lens: Bent Filter Ring and Sand in the Focus Helicoid
This Mamiya 7 80mm lens came into the shop with a badly damaged front filter ring and stuck focus. Not only was the filter ring deeply bent, but the name…
Mamiya 645 80mm f/1.9: Cine Conversion Warnings
Cine converting Mamiya 645 lenses is very popular these days. As a minimum, they are de-clicked and a focus gear is installed. Here is a warning with these…
Mamiya 645 80mm f/1.9: Lens Separated into Two Pieces
This lens, a Mamiya 80mm f/1.9 for the Mamiya 645 series, came into the shop in two pieces as shown in the second photo. This is not unusual for this lens…
Mamiya 645 80mm f/1.9 Cine Lens: Loose Focus Ring Setscrews
This Mamiya 80mm f/1.9 cinema modified lens came into the shop with a loose focus ring. Not an uncommon issue with this lens as the focus ring is held to…
Mamiya 645 110mm f/2.8: Removing Moly Paste from the Focus Helicoid
Servicing a Mamiya 110mm f/2.8 lens for 645. Lens came in with focus rough and erratic. On disassembly, the focus helix was found to be lubricated with a…
Mamiya 645 80mm f/1.9: Sand in the Focus Helicoid
The 80mm f/1.9 lens for Mamiya 645 came into the shop with a complaint of possible sand damage. The focus ring turned smoothly but every once in a while…
Mamiya 645 80mm f/1.9 N: Wrong Lubricant on Focus Helicoid
This Mamiya 645 lens, 80mm f/1.9 N, came into the shop with a focus that was very tight and grinding. Seemed to have no lubrication on the focus helical…
Mamiya 645 80mm f/2.8: Oily Diaphragm and Loose Focus
This 80mm f/2.8 lens for the Mamiya 645 wins the prize for most oil on lens diaphragms this week. Also, the focus was very loose and uneven. For the lens…
Mamiya 645 80mm f/2.8: Over-Lubricated Focus Helix and Diaphragm
This 80mm f/2.8 Mamiya 645 lens came into the shop with complaints of stiff and uneven focus and sticking diaphragm blades. On disassembly, I found that…
Mamiya 645 80mm f/1.9 Lens: Why It Comes Apart in Two Pieces
Servicing a Mamiya 80mm f/1.9 lens for the 645. This is the third 80mm f/1.9 to come into the shop this month in two pieces. Here is why: the lens has a…
Mamiya 55mm SX f/1.4 Lens: Cleaning and Regreasing the Focus Helix
Repair on Mamiya 55mm SX f/1.4 lens. This particular lens, from around 1975, needed the focus helix disassembled, cleaned and re-lubricated. The focus ring…
Mamiya 645 80mm f/1.9 Lens: Repairing a Lens in Two Pieces
Mamiya 80mm f/1.9 lens for 645. This lens arrived in two pieces. Not sure how this happened but after some repair to the helical guides, complete cleaning…
Stiff Focus Issues on Mamiya Lenses
Most of the lenses coming into the shop with stiff focus problems are either 645 lenses or Press Universal lenses. This is caused by the focus helicoid…