Krasnogorsk-3 Meteor 17 69mm Zoom lens?

[mr_x]

Hi,

This post runs on from here: viewtopic.php?f=1&t=23359&p=205522#p205495
but with a change of subject header.

I noticed a glitch in some K-3 test footage after it was transferred. It was transferred twice using a different projector lens each time, so the fault is not with the projector.

http://youtu.be/vpXAEIhe5c4

http://youtu.be/K7bwTmKukN4

A small dot - just below centre - is there in both clips, so it is not the projector or projector lens. I have isolated and highlighted the dot in the following set of stills. I went over the K-3 lens with a magnifying glass under a strong light source and this is what I saw.

http://s124.photobucket.com/albums/p32/ ... asnogorsk/

Can anyone identify these spidery marks, specks & spots which seem to be on the inside of the front lens optic please?

Many thanks,

Ric

[MIKI-814]

I would say the spider mark in the edge is the typical lens fungus, isn't it?

[BAC]

That looks like a classic case of lens mold. it's very difficult to clean because you have to take the lens apart and if the lens is coated it will remove the coating. I read somewhere that you can clean it with a 50/50 mix of ammonia and hydrogen peroxide. It dissolves the mold right off the lens. If you try that do it in a well ventilated area, I'm sure the fumes will be nasty. I have a Kern Vario Switar that had mold and a non-working light meter. I sent it to Roger Sharland (http://www.roger-sharland.co.uk/) and he was able to remove the mold and get the meter working again. I'm not sure what he did to remove the mold but the lens is like new with no visible damage to the lens coating.

[mr_x]

That looks like a classic case of lens mold. it's very difficult to clean because you have to take the lens apart and if the lens is coated it will remove the coating. I read somewhere that you can clean it with a 50/50 mix of ammonia and hydrogen peroxide. It dissolves the mold right off the lens. If you try that do it in a well ventilated area, I'm sure the fumes will be nasty. I have a Kern Vario Switar that had mold and a non-working light meter. I sent it to Roger Sharland (http://www.roger-sharland.co.uk/) and he was able to remove the mold and get the meter working again. I'm not sure what he did to remove the mold but the lens is like new with no visible damage to the lens coating.

Blimey, thumbs up for Roger Sharland then!

I would never go near opening an infected lens - for obvious reasons - but then again I know nothing about the workings or interior nature of lenses.

I also found debris on the rear element interior - that would almost certainly cause the blip on my frames?



The lens has been returned now. If the seller replaces it with another lemon I will feel like airing his name loudly on the Internet, if only to save others from being duped. My lens was advertised as "clean", it was about as clean as muck.

Ric

[mr_x]

That looks like a classic case of lens mold. it's very difficult to clean because you have to take the lens apart and if the lens is coated it will remove the coating. I read somewhere that you can clean it with a 50/50 mix of ammonia and hydrogen peroxide. It dissolves the mold right off the lens. If you try that do it in a well ventilated area, I'm sure the fumes will be nasty. I have a Kern Vario Switar that had mold and a non-working light meter. I sent it to Roger Sharland (http://www.roger-sharland.co.uk/) and he was able to remove the mold and get the meter working again. I'm not sure what he did to remove the mold but the lens is like new with no visible damage to the lens coating.

Blimey, thumbs up for Roger Sharland then!

I would never go near opening an infected lens - for obvious reasons - but then again I know nothing about the workings or interior nature of lenses.

I also found debris on the rear element interior - that would almost certainly cause the blip on my frames?



The lens has been returned now. If the seller replaces it with another lemon I will feel like airing his name loudly on the Internet, if only to save others from being duped. My lens was advertised as "clean", it was about as clean as muck.

Ric