Cleaning a camera lens (internal fungus)

[75RR]

Anyone have any experience opening a camera lens up to clean/remove fungus? Any tips?

[NicoVB]

I did it with an old lens.
Don't know if you had any technical education, but if you feel confident you should just do it.
It's no rocket science, and old manual lenses are pretty logical in their build up.
I completely took it apart, even the shutter blades.
I made some markings on the lens, and wrote a lot down, like the position of the focusring and the F-values.

But it was a cheap old Zuiko 50mm lens that cost me around 5 euro, so i did not take much risk in case i screwed up.
Bur sure to have the right tools, like small watch wrenches and stuff.
Your biggest enemy when putting it back together is dust...

What lens are you talking about here?

How far you want to go?
Only fungus removal or is there also oil on the shutter blades.
Be aware that fungus often destroys the coating on the lenses, and you can not repair that.

[75RR]

Hi NicoVB,

curiously the same lens type/manufacturer - fungus is rife in the tropics.

So an Olympus OM 50mm and an Olympus OM 75 - 150mm zoom
The 50mm is a bit small, so there is vignetting.
However I am hoping to use the zoom on the microscope (until I can source a 100mm or 135mm), 75mm is just on the edge.
I like the idea of being able to vary the size of the field of view.

Did you have to deal with any glue or is it all held together with screws?

[NicoVB]

Nothing is glued, all mechanical connections.
Take a look at the video here:
https://www.youtube.com/watch?v=aj0S55-aXjQ

[NicoVB]

Always handy you know how an objective is build on the inside,
Here's the lens arrangement of the 70-150


But look out with zoom objectives on the microscope, they usually are not nearly as sharp as a prime.
I don't understand why you would use a zoom lens?
Be aware of the Angle of View(AOV) !
35mm: 34°
50mm: 47°
I actually bought an old Zuiko Digital 35mm f3.5 macro to use in my afocal setup.
The picture is a bit optimistic, but i hope you understand what i mean with AOV.

Angle of view.png (8.33 KiB) Viewed 5581 times

If you use that 70-150 zoom, the AOV will only be smaller...

[75RR]

Thanks NicoVB,

now I am scared! ;)

[NicoVB]

Here is the exploded view of the 70-150.
Now you should start being scared

http://allphotolenses.com/public/files/ ... 7bb073.pdf

[NicoVB]

But what i wanted to point out is that you need a wider lens, if you already having vignetting with the 50mm.
Like i said, maybe search for a 35 of 38mm.

Do you understand why? I'm not sure if i'm being clear about it.

[75RR]

This is the Micpro/Projektiv f=63mm (Micpro is the older version)
It projects an infinity image that requires a camera lens.
I have been using a "lifted" kpl eyepiece projected directly on to the sensor until now.




This is the screen area I get.