Dismantling a lens to clean

scottishmonkey

scottishmonkey

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Derek
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I guess this is fraught with dangers but given the lens in question (18-70mm) is only worth £125 or so I am wagering repair is not worth it?

Noticed a few marks/dust on the underside of the front element and would like to remedy this if feasible?

Anyone else beef daft enough?

TIA
 
If make a hash of it turn it into a nice holder for your pens :)
 
C'mon a few bits of dust aren't going to affect it! Don't do it!
 
I've tried to 'repair' Hama 2x FD converter (it was maybe worth 20p to start with). Now I have some magnifying glass and FD mount ring. Unless the lens is packed full of soil, hair and fungus I would leave it.
 
The sensible thing to do is leave it but curiosity is a b*gger :D
 
scottishmonkey said:
I guess this is fraught with dangers but given the lens in question (18-70mm) is only worth £125 or so I am wagering repair is not worth it?

Noticed a few marks/dust on the underside of the front element and would like to remedy this if feasible?

Anyone else beef daft enough?

TIA
Click to expand...

Do they show up on prints? Even if they do it cannot be worth pulling it apart.

But good luck to you if you do. Any guide vids etc on "youtube" that could help?
 
London luke said:
Do they show up on prints? Even if they do it cannot be worth pulling it apart.

But good luck to you if you do. Any guide vids etc on "youtube" that could help?
Click to expand...

Took a couple of pics to see but they appear to be clear
 
I have a single bit of white dust inside my Canon 25-105L it's been there since new but has never affected any of my images, I can't take a photo for the life of me so I'd hardly notice LOL.

If you can't see them on your images leave it well alone :D
 
Did mine took about an hour... but it was a little more than 2 or 3 specks of dust. So if that's all you have in yours then leave it alone. ;)

If its bad and what looks like the start of a fugal assault then it may be worth it.

Bare in mind you will need some pritty stong chemicals to kill the fugus properly.

The hardest part,,,,, well the most time consuming was getting the element back in WITHOUT more dust on the inner surface it took me 4 goes.

Buuut if the urge to tamper gets the better of you......... :shake:

Drop me a PM and I'l rustle up some directions for your habit !!:thinking:

S'ok i suffer from the same habit I have to take it apart to see how it works :shrug:

HTH..
 
I had an old broken Pentax 28-80 AF that I took apart just for the hell of it. No intention of getting it repaired, and I thought that if I didn't get it back together I could use the elements for something weird (photographically speaking). I'm an engineer by job and I'm no stranger to taking things apart and putting them back together (with nothing left over). It wasn't a lens that could be disassembled from the front, and everything had to come off from the mount end.

It started off well, with the bayonet mount coming off ok, then another bit, all straightforward and easy to remember. But when I took another ring section off, out on to the table poured a mass of springs, balls, and plastic bits. And absolutely no hope of working out where they had come from. It was all downhill from there. The cylindrical cams for the zoom mechanism would also have been a pig to put back together properly.

So I got some nice lenses to play with, and also made a decent magnifying loupe from one of the internal cylinders and elements.
 
The front element is the easiest to remove usually. just unscrew the ring from the front.
 
I'll lay 10:1 he does it anyway.

Now the idea is in his head he's not going to shift it.
His fingers are already reaching for the screwdriver and the lump hammer.
 
more than likley.....

and good luck to him if he does :thumbs:

right where's that screwdriver :thinking:

:lol:
 
Woblee said:
If make a hash of it turn it into a nice holder for your pens :)
Click to expand...


or turn it into something like this & then have the ONE & only Nikon lens cup....

 
So someone has finally found a good use for a Nikon lens.......:exit:

Ok ok, stop getting all uptight you Nikon owners....it's only a joke. Somebody had to say it. I'm sure a Nikon is the nicest camera I've never owned.

But thinking about it, if it was sealed correctly you could have a variable volume drinking mug. Zoom out for more.
 
Whatever you do don't stop for dinner half way through, I did that and couldn't remember in what order it came apart and what bits went where.
 
Kev M said:
Whatever you do don't stop for dinner half way through, I did that and couldn't remember in what order it came apart and what bits went where.
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Stopping for dinner?? Crikey I'm like that if I went for a P :bonk:
 
Thanks for the replies

Been off work for a couple days with the dreaded lurgy and was comIng round to thinking of just leaving it but getting a mug and loupe out of the deal might have just swung it :D

Are there repair or assembly manuals for these critters or even just an exploded 3D view????
 
scottishmonkey said:
Thanks for the replies

Been off work for a couple days with the dreaded lurgy and was comIng round to thinking of just leaving it but getting a mug and loupe out of the deal might have just swung it :D

Are there repair or assembly manuals for these critters or even just an exploded 3D view????
Click to expand...

Went searching as I like a challenge (finding stuff) and found these if they are any help....

"18-70mm repairs"

or you could ask this fella on ebay as he has one for the 18-55mm "18-55mm repair manual"

edit:

that 1st link isn't really doing anything but the 2nd might give you some idea althou its for the 18-55mm.... But hey its worth a try thou
 
I see he says he has one for 18-70 so will give it a punt

Thanks :thumbs:
 
Your welcome.... Like you say its worth a punt...
 
I bought an 18-55 off a member with a broken mount, cheap. Took the mount off my 18-55 with broken AF and put it on the one I bought and ended up with a working lens! Even had to do a little bit of soldering!

Found a repair manual on a site which had loads on, I'll try and track it down. If not keep Googling and you'll find it eventually,
 
Jim B said:
.....If not keep Googling and you'll find it eventually,
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Thats what I did but the only annoying thing is that on some they had a pdf & when you try & open the link to it it goes to a similar page where you hit that link again & again & then you dont get anywhere... :bang:

On another one I found, they wanted $19 for a pdf download.... :suspect:
 
OK manual on the way. Will have a read/look and decide from there. Will keep you posted on here or watch the sales forum for a mug :lol:

Thanks for the pointers *** people :thumbs:
 
Go for it. I did the same on my Canon 17-55 which was dustier than a dusty thing. Info here. I imagine you just need to go in from the front. Take pics as you do it so you can remember how it all goes back together.
 
Was the manual sourced from that ebay geezer?

Interesting to know for future reference really .....
 
Better keep that link then ;)
 
Dismantling a lens to clean
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Potentially suicide :cuckoo:

You take a shot and no marks appear:shrug:.

I'm not totally clued up on the nikon lettering system but i'm sure its the cheapo fantastico one.

Your money i Guess
 
Cgeezer asked me about this on a 50mm E series lens he had. We looked on the internet and found a complete dismantling guide. He then did it without problem. With that particular lens it was unusable as it was and became perfect so mission accomplished but I wouldn't do it with a lens that you can't see the dirt on.
 
Manual received. I do not have the nuggets for this :cuckoo::D

Will leave well alone for now.....
 
Damm I was thinking that you was going to say that you'd repaired it for a min then....
 
If it's for fun, then go ahead, but as already said be prepared to lose the lens.

I recently opened up a pentacon 4/200, rebuilt the 15 blade aperture and made a new actuating pin. Great feeling when it works.:thumbs:
 
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