This chapter is about the Rick Oleson's 'Brightscreen'. This is a fresnel ground glass that he does for several TLR models, he had Superb in his listing so I ordered at the same time I ordered the mirror.
The key for adjusting the viewing lens is not doing anything with the viewing lens itself but having the mirror perfectly placed and most important is the screen at the rails.
Original ground glass, see distance from matte side to the lower frame.
Ground glass distance to frame.
Rick’s screen just put.
The distance for focusing is enough to have a error of 10-15cm in focusing wide open, the key is to lower the screen, not easy since it’s flexible, Voigtlander guys didn’t expect a flexible ground glass to be placed.
Here is the frame holding the screen. I ad to make the notch wider because it was pushed by the spring that holds the ground glass so it made the frame go up.
Frame and notch.
All I did was to flatten the frame as much as I can and I added a 0.25mm shim from the Martin mirror to the left rail to push the screen a bit down.
Shim on left rail.
Here is the result.
Now the last test, from left to right, Rolleicord V, Rolleiflex 3.5C and Rolleiflex 3.5F, all photos are named with the camera I was focusing, I still think the focus is 1-2cm ahead but it’s covered by the 4cm of the DOF at this distance at f/3.5
Good enough for me, I’m closing the camera for curing the leather before more shooting.
PS: Superb cameras have often missing parts, the most common missing parts are the prism holder near the lens to read the shutter speeds, the second most often missing part is this knob, one was missing in one of my Superb.
Focusing knob (original).
Lucky me I have a 3D specialist next to me and she made the first version, we ordered in new-silver metal, this v1 has small screw holes and I opened a bit for inserting the piece, corners were sharp and she has rounded them and polished the piece, very nice job overall!! Second version will be definitely the keeper. Sadly I couldn’t find the correct screws so this two ones are a bit smaller than the original so thread won’t be spoiled if later I find a better fit.
Focusing knob, 3D done and polished.
Now it's time to take the camera for a walk with film inside...
Thank you for looking.