Focus
45 posts tagged Focus. 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…
RZ67 Pro II: Rough Focus from Broken Fine Focus Gear
Complaint on this Mamiya RZII was rough focus. In almost all cases, this is caused by a damaged fine focus gear. On removing the right side cover, the…
Mamiya 7 80mm Lens: Unsharp Images, Cam and Focus Calibration
My client sent in his Mamiya 7 and 80mm lens complaining of images that did not have optimum sharpness. On checking the camera rangefinder, I found it to…
Mamiya 6 75mm Lens: Unsharp Images from Loose Front Element
Sometimes the problem on a camera/lens turns out to be something different than what is first expected. In this case, my client told me that his Mamiya 6…
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 C330 Pro F: Focus Screen Foam and Light Seals
This Mamiya C330 Pro F came into the shop with a focus complaint. In many of these cases, the issue is with the foam on the focus screen becoming…
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 65mm Lens: Flex Cable, Cold Shutter Delay, Focus Issues
This Mamiya 7 65mm lens came into the shop with a few issues: Broken flex cable (very common) Delayed shutter release Focus issues The broken flex cable is…
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…
RB67: Aftermarket Bellows Blocking Infinity Focus, 127mm K/L Haze
This Mamiya RB67 arrived with a complaint of focus error. While I did not see a focus error, I did notice that the bellows had been replaced and while the…
Mamiya 6 50mm Lens: Full Open Shutter Modification
This Mamiya 6 50mm lens is in the shop for modification to full open shutter. I have clients who need this mod to be able to use the lenses (Mamiya 6/7) on…
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 C3: Replacing and Calibrating a Broken Focus Screen
This Mamiya C3 came into the shop with a fairly common issue- a broken focus screen glass. Replacement is straightforward, but the finder needs to be…
Mamiya C 80mm Lens: Taking and Viewing Lens Focus Mismatch
On intake, all Mamiya C series lenses get examined to insure that the taking and viewing lenses are focusing at the same point. This particular 80mm lens…
Mamiya 7 65mm Lens: Measuring Front and Rear Group Spacing
Inspecting a Mamiya 7 65mm lens for potential focus issues. All lenses that I service get certain parameters evaluated and on the Mamiya 7 65mm and 43mm…
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/1.9: Lens Out of Focus Tolerance
This Mamiya 645 w/80mm f/1.9 lens came into the shop with a complaint of poor focus. In checking the lens, I found it to be plus 0.16mm out of tolerance as…
Focus Fixtures for Adjusting Mamiya Lens Infinity
My once a year dusting of focus fixtures. The tools are used to adjust focus on Mamiya medium format and 35mm lenses. Each fixture has a small mirror at…
Mamiya 645 80mm f/2.8 N: Loose Focus Ring and Slow Diaphragm
Servicing an 80mm f/2.8 N Mamiya 645 lens. This lens came into the shop with the complaint of a loose focus ring. A straightforward repair where some…