Pentacon 135mm F2.8 Bokeh Monster Lens M42 Mount


tonza1992

Link Posted 18/04/2017 - 15:44
Hey everyone,

Looking to get some advice from you intelligent lot! I recently purchased a Pentacon 135mm F2.8 and although the cosmetic condition is very good, there are some issues with the internal glass elements. I will attach some images for you to view and hopefully you could tell me if this lens is a bum or not.

It seems like the front and rear elements, on the interior side, have some wiping marks and are quite easy to distinguish. Then on one of the middle glass elements, the edges seem to be cracked or the adhesive has cracked and formed some yellowish crusty stuff.

What are your opinions on the lens? Keep or return? I generally keep all my gear well looked after, so I am annoyed that there was no mention of this on the listing.




Chrism8

Link Posted 18/04/2017 - 15:55
You don't mention where you purchased the lens, to a degree it doesn't matter, I would if it was mine, return it, as it potentially isn't as described, if you picked it up from a retailer, did they give you a short warranty, if its from Ebay, go through their procedures.

If it was really really cheap, I might not bother with the hassle.
Chris

www.chrismillsphotography.co.uk

" A Hangover is something that occupies the Head you neglected to use the night before".

-------------------------------------------------------------
K1 - Sigma 85mm F1.4, Pentax 150 -450 F4.5 / 5.6, Pentax FA 24 - 70 F2.8

Sigma 100-300 F4, Samyang 14mm F2.8, Sigma 70-200 F2.8,

K5iis - Sigma 17 - 70 F2.8, Sigma 70 - 300 F3.5/F5.6, Sigma 18 - 200 F3.6 / F4.5.
Last Edited by Chrism8 on 18/04/2017 - 15:57

tonza1992

Link Posted 18/04/2017 - 16:02
Chrism8 wrote:
You don't mention where you purchased the lens, to a degree it doesn't matter, I would if it was mine, return it, as it potentially isn't as described, if you picked it up from a retailer, did they give you a short warranty, if its from Ebay, go through their procedures.

If it was really really cheap, I might not bother with the hassle.

Yeah, it was Ebay. You are right. It's unfortunate that it's not as clean as I had hoped. I'm guessing the marks will have affect images in some way. Too bad I did not get it for cheap, haha. Otherwise I would have kept it.

davidwozhere

Link Posted 19/04/2017 - 00:45
All Meyer/Pentacon 135s will show what looks like 'something wrong' around the inside, just beneath the front element. There is a thin brass shim in there, the appearance of which gets slightly distorted because it is so close to the edge of the glass element. What is on the images here looks a bit excessive however. Without handling it I cannot comment further.
If the seller is a reputable Ebayer (like me) you should be offered a refund straightaway. Contact the seller privately first (don't just open a case or use the 'item not as described' option - which opens a case!!) and try to resolve it amicably. If you get told where to go, then you open a case, but it should never get that far.
(edited in)... You seem to want it not to be 'a bum'. If you really want to keep it, carefully unscrew the front ring and clean the front element, which comes out very readily (make sure it goes back in the right way up). At the same time, you can check that brass ring - which does go greenish like your photo - it's brass! Unscrew the conical rear mount and you can then do exactly the same with the rear element (which can be further dismantled ito two halves). The only risk you take doing this is slipping and scratching the glass. Otherwise it's very easy and foolproof. Message me if you want to know more.
Both the *istDS and the K5 are incurably addicted to old glass

My page on Photocrowd - link
Last Edited by davidwozhere on 19/04/2017 - 00:56

tonza1992

Link Posted 19/04/2017 - 20:18
davidwozhere wrote:
All Meyer/Pentacon 135s will show what looks like 'something wrong' around the inside, just beneath the front element. There is a thin brass shim in there, the appearance of which gets slightly distorted because it is so close to the edge of the glass element. What is on the images here looks a bit excessive however. Without handling it I cannot comment further.
If the seller is a reputable Ebayer (like me) you should be offered a refund straightaway. Contact the seller privately first (don't just open a case or use the 'item not as described' option - which opens a case!!) and try to resolve it amicably. If you get told where to go, then you open a case, but it should never get that far.
(edited in)... You seem to want it not to be 'a bum'. If you really want to keep it, carefully unscrew the front ring and clean the front element, which comes out very readily (make sure it goes back in the right way up). At the same time, you can check that brass ring - which does go greenish like your photo - it's brass! Unscrew the conical rear mount and you can then do exactly the same with the rear element (which can be further dismantled ito two halves). The only risk you take doing this is slipping and scratching the glass. Otherwise it's very easy and foolproof. Message me if you want to know more.

Thanks for the comment. I had a go and cleaned the front and the two rear elements. It is looking much cleaner now, although there are what looks like some old fungus trails. I would guess that someone opened the lens up previously and left cleaning marks on the glass. But overall I'm quite happy. Especially that I have received a refund and was told by the seller to just keep the lens!!!
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