Voigtlander Bessa dust in lens

trondsi · Jun 20, 2017

Hi folks!
When I hold up my open Voigtlander Bessa to the light and look through the lens, I can see numerous small dust particles inside the lens. These are not so visible if I look from the front, reflecting light off the metal inside. Would it be worth the effort and money to have the dust removed?

greg zinselmeier · Jun 20, 2017

Dan Daniel · Jun 20, 2017

Me: Hey, doctor, whenever I lift my shoulder like this and turn my neck to the side I get a sharp pain in my ribs.
Doctor: Then don't do that.

trondsi · Jun 20, 2017

You guys are hilarious. OK thanks!

tedr1 · Jun 21, 2017

A small amount of dust is fairly harmless, it is located a long way from the focus of the lens and so is out of focus.

shutterfinger · Jun 21, 2017

What lens/shutter combination does your camera have?
If the dust is between the front and rear groups it will be easy to unscrew the front group from the shutter and clean the surfaces next to the shutter and aperture blades.

LAG · Jun 22, 2017

I'm sorry about the dust, but I love this thread!

tedr1 · Jun 22, 2017

shutterfinger said:
What lens/shutter combination does your camera have?
If the dust is between the front and rear groups it will be easy to unscrew the front group from the shutter and clean the surfaces next to the shutter and aperture blades.

The focusing adjustment is a multi-start thread, I seem to recall three starts. To obtain correct calibration of the lens focus scale, following removal and replacement of the front element, requires the identification of the different thread starts. This is not as trivial as it may seem. Ask me how I know

thuggins · Jun 22, 2017

I recently got a Kodak Tourist that was in great shape, except for quite a bit of fungus on the inner surface of the rear element and also inside the viewfinder. A few hours in the Texas sun is enough to kill about anything, but as we know. the remains of the fungus are still there.

Luckily, the rear element unscrewed with little trouble and the lens cleaned up beautifully. A bit of the coating was gone but there was no damage to the lens. By setting the shutter to T I was able to carefully clean the inside of the from elements. The top came off easily and the viewfinder cleaned up crystal clear.

That being said, I wouldn't bother for dust.

Dan Daniel · Jun 22, 2017

tedr1 said:
The focusing adjustment is a multi-start thread, I seem to recall three starts. To obtain correct calibration of the lens focus scale, following removal and replacement of the front element, requires the identification of the different thread starts. This is not as trivial as it may seem. Ask me how I know

Put the lens at or near infinity. Remove the stop screw or such. Now rotate the front element past infinity, lightly screwing it further down into the lens. Soon it will stop at the end of the threads. Make marks or notes on what aligns with what at this point- a screw hole with a letter on the lens, whatever, you just need a solid reference point on the lens and on the shutter.

Now unscrew and do what you need to do. When you reinstall the lens rotate it all the way back in again. Keep adjusting the start point until it ends at the referenced points. Now back it out a bit, reinstall the stops.

Voigtlander Bessa dust in lens

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