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Voigtlander Bessa RF 6x9

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Re: Voigtlander Bessa RF 6x9

Postby alexvaras » Thu Jan 25, 2018 11:24 pm

I think it has the spring is well put and I found the film tight, but from now I will remove the film just in the shop and I will cover it with "dark magic" spell.

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Re: Voigtlander Bessa RF 6x9

Postby alexvaras » Fri Feb 02, 2018 11:40 am

New test roll, I put some marks along the corridor with laser measure distances, with each shot I wrote down the setting on the camera's dial.
The collimation I tried with the digital camera said at 8 metres in the dial, inf is becoming sharp.
Film Delta 400 pull 1, 100 at f3.5 (I wanted maximum DOF)

Distances in the corridor are: 27.7, 21.3, 18.9, 13.5, 7.6, 5 and 3 metres. See A4 papers with numbers.

Dial at inf, we know the results

Dial at 8 metres

Dial at 7 metres

Dial at 6 metres

Dial at 5 metres

Dial at 4 metres

Dial at 3 metres

Dial at 2 metres

So, it seems that around 8m at cameras dial everything start to be focused and sharp at inf and for me the camera now its consistent, I mean "it works" but the lens its not in place.
How the lens could go to this position? My guess is someone opened it and put it back not very well.
The next pictures show one rail where the camera goes when focusing... at inf the position is the closest to the film and when its 1 m at focusing dial I can see a lot of space that the lens can go ahead.

Blue line=distance of the lens traveled, no blue line inf position at dial, the longer the less distances says the dial.
Red arrow= where the lens is located.
Green arrow = distance that it can be traveled by the lens. (actually its two mm less from the end)

Here the lens is closest to the film plate, inf position in dial.
IMG_1069.JPG (135.81 KiB) Viewed 2974 times

Here the lens is at 8m at dial, it moved around 2 mm from the previous position.
IMG_1072.JPG (120.78 KiB) Viewed 2974 times

Here the lens is the most far from the film plate, 1m in dial.
IMG_1070.JPG (121.53 KiB) Viewed 2974 times

Here now goes my guess:
Checking the camera is obvious to me it has been opened in the past, I think the last time was for a CLA or at least reposition the internal rangefinder, but when they where doing it they lost the point when the lens should be at inf, thats why now its at the closest position.
To confirm my theory I need to check the position of that rail in a collimated camera.
Mike, can yo check yours if you still have it?
Meanwhile I only can measure the distance from the actual position to the position I think it should be the lens, quit the shutter, open the rangefinder and start working with those mechanisms to put the shutter where I want at inf position. Again put the shutter back and do another collimation test with the digital camera, if I see its good, go and shoot again.
EDIT: I could go directly to the rangefinder, try to fix its internal rangefinder, position the lens where I want and put the dial at inf (without touching the gears inside) It seems a easier fix.
Any more ideas? :)

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Re: Voigtlander Bessa RF 6x9

Postby alexvaras » Sun Feb 04, 2018 4:46 am

I went for the easy option and I ended with all disassembled :)

If you go till the end, congrats.

This is an older version of Bessa 6x9 rf rangefinder I saw on other forum and explained in german.

For every step, a picture, I will try to write comments later.

IMG_1073.JPG (100.62 KiB) Viewed 2953 times
IMG_1074.JPG (91.95 KiB) Viewed 2953 times
IMG_1076.JPG (115.08 KiB) Viewed 2953 times
IMG_1078.JPG (106.17 KiB) Viewed 2953 times
IMG_1079.JPG (102.46 KiB) Viewed 2953 times

That tab on the ring is the infinite spot focusing
IMG_1080.JPG (125.36 KiB) Viewed 2953 times

For the test I did, infinite start to be sharp at 8 on this dial.
IMG_1081.JPG (114.78 KiB) Viewed 2953 times

So with a calliper I measure the distance of the lens plate to the camera.
IMG_1088.JPG (92.27 KiB) Viewed 2953 times
IMG_1089.JPG (92.54 KiB) Viewed 2953 times
IMG_1090.JPG (116.84 KiB) Viewed 2953 times
IMG_1091.JPG (110.58 KiB) Viewed 2953 times
IMG_1092.JPG (110.17 KiB) Viewed 2953 times
IMG_1093.JPG (111.89 KiB) Viewed 2953 times

For quit this ring just continue turning ccw
IMG_1094.JPG (101.84 KiB) Viewed 2953 times
IMG_1095.JPG (101.49 KiB) Viewed 2953 times
IMG_1096.JPG (87.54 KiB) Viewed 2953 times

6x4.5 mask
IMG_1099.JPG (99.04 KiB) Viewed 2953 times
IMG_1100.JPG (79.62 KiB) Viewed 2953 times
IMG_1104.JPG (97.42 KiB) Viewed 2953 times

Detailed view of the rangefinder. Dirtiness, loose screws, welded screws, glued screws, dirty mirrors, I-dont-know-why-this-screw-is-here.
Who ever came before me... it seems to me he was a blacksmith.
IMG_1105.JPG (116.9 KiB) Viewed 2953 times
IMG_1106.JPG (119.26 KiB) Viewed 2953 times
IMG_1107.JPG (118.19 KiB) Viewed 2953 times
IMG_1108.JPG (112.77 KiB) Viewed 2953 times
IMG_1109.JPG (117.23 KiB) Viewed 2953 times
IMG_1110.JPG (105.49 KiB) Viewed 2953 times
Last edited by alexvaras on Sun Feb 04, 2018 8:24 am, edited 1 time in total.

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Re: Voigtlander Bessa RF 6x9

Postby alexvaras » Sun Feb 04, 2018 4:53 am

IMG_1112.JPG (102.06 KiB) Viewed 2953 times
IMG_1113.JPG (112.49 KiB) Viewed 2953 times

Red arrow: Screw that make pivot the rangefinder middle mirrors, vertical calibration. Axe pivoting in blue.
IMG_1114.JPG (130.53 KiB) Viewed 2953 times

Green arrow: That screw was too tight, not allowing the rangefinder arm (blue) come back to the rest position (infinity)
Red arrow: welded screw.
IMG_1115.JPG (105.57 KiB) Viewed 2953 times

Loose screws.
IMG_1116.JPG (94.3 KiB) Viewed 2953 times
IMG_1117.JPG (63.87 KiB) Viewed 2953 times

Homemade shims, paper glued.
IMG_1118.JPG (86.79 KiB) Viewed 2953 times

Removing the gears of the of the focusing arm better to take all the arm out, easier.
IMG_1119.JPG (105.25 KiB) Viewed 2953 times
IMG_1120.JPG (84.46 KiB) Viewed 2953 times
IMG_1121.JPG (132.89 KiB) Viewed 2953 times
IMG_1122.JPG (73.48 KiB) Viewed 2953 times
IMG_1123.JPG (77.79 KiB) Viewed 2953 times
IMG_1126.JPG (72.52 KiB) Viewed 2953 times
IMG_1127.JPG (122.45 KiB) Viewed 2953 times

Now, clean, lubricate and adjust (last part mostly unlikely) and put everything back in place.

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Re: Voigtlander Bessa RF 6x9

Postby Julio1fer » Sun Feb 04, 2018 9:02 am

Very impressive!

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Re: Voigtlander Bessa RF 6x9

Postby OpenWater » Sun Feb 04, 2018 10:12 am

Welded screws! Wow. Good luck with this.

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Re: Voigtlander Bessa RF 6x9

Postby scott » Sun Feb 04, 2018 1:02 pm

Hat’s off to you Alex. Very ambitious. Good luck!

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Re: Voigtlander Bessa RF 6x9

Postby alexvaras » Sun Feb 04, 2018 1:59 pm

OpenWater wrote:Welded screws! Wow. Good luck with this.

I have the un-welder and I know how to use it, but... the position of that screw is on place atm until I do the new focusing test among the rangefinder.

scott wrote:Hat’s off to you Alex. Very ambitious. Good luck!

Thanks, the rangefinder is on the position again but its dark already, tomorrow I will adjust it (try at least) with daylight.
So far I have two screws that I don't need, its not that I dont know where I found them, its just even before where placed doing nothing!
And I need one to attach the left mirror, the previous one is out of thread already or the thread is broken. Once I have the rangefinder calibrated, I need a solution for it... Electric liquid tape? Or new hole thread + new screw?

EDIT: Im gonna try to get the left screw of the pivotal system of the rangefinder, it was glued and now it is short, need a longer one, when I visit the watch shop I will look for a sample.

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Re: Voigtlander Bessa RF 6x9

Postby PFMcFarland » Mon Feb 05, 2018 11:03 pm

Quite the project there, Alex. But sometimes you just have to do it to fix what someone else has messed up.

Waiting for the light

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