Cleaning a vintage 3,5 mm external finder

[fabianoliver]

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Hello all.

someone knows if this viewfinder can be dismantled and cleaned?

the optics are broken in the edges, clearly this cannot be fixed, but I was wondering if can be cleaned, cause someone is selling it along with a summaron 35-3,5 ( cosmetically bad) but with good glasses.

txs for your opinions

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[zeitz]

Hard to tell exactly from the photo, but it looks like fungus to me.  Often, be not always, the traces of fungus can be removed.  Mix 10 parts hydrogen peroxide and 3 parts ammonia; soak and wash with this mixture using lens cleaning tissues; rinse; then clean with normal lens cleaning fluids.

[fabianoliver]

Thanks Zeitz, Do you know how can I dismantle it to clean the inner side of the optics?

txs!

[zeitz]

I do not.  I do not have one to check.

[a.noctilux]

Hello @fabianoliver

the title may be change to 3,5cm.

I have one in good shape "SBLOO", but don't know how to open.

For me this finder would be very difficult to open, as the two screws under it do nothing ...

[alan mcfall]

I guess the optics are inserted as a unit through the large front opening, and retained with adhesive.  Heat may be required for disassembly, but how much and how long, I don't know, never tried it.

 

[mikemgb]

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I bought one of these with a loose front element a year or so ago, it rattled around a fair amount but it wouldn’t come out. There were definite signs of dried adhesive around the edge of the element, but I believe there is also a very slight crimp or roll to the front edge which prevented it falling out. 

[fabianoliver]

4 hours ago, alan mcfall said:

I guess the optics are inserted as a unit through the large front opening, and retained with adhesive.  Heat may be required for disassembly, but how much and how long, I don't know, never tried it.

 

hello Allan, you are right, heating can be an option.... let's see, if i pick it up, i'll post the results

[fabianoliver]

4 hours ago, a.noctilux said:

Hello @fabianoliver

the title may be change to 3,5cm.

I have one in good shape "SBLOO", but don't know how to open.

For me this finder would be very difficult to open, as the two screws under it do nothing ...

Thanks Arnaud, i don't know where to go to change the tittle, i post it from the phone, my bad

[PEDROFIZ]

Hello Fabian.

could you clean the SBLOO?

I have bought one I would like to clean some dust inside.

Thans for searing!!!