This morning's work : Early Seiki Kogaku 13,5cm !

Mael

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Hi folks !

This morning is what the postman brought me from a camera collector : an early Seiki Kogaku Serenar 13,5cm f/4 uncoupled lens, for haze cleaning.

Well, let's clean ! I'll post pictures when it will be finished !

Seiki.jpg
 
Mael, I am looking forward to seeing the end results. Really not as many major pieces to this lens as I thought there might be.
 
Thanks for the # and the lens is a T4 in the 135mm f/4 list and one of the most common of the SK lenses of which there were four TYPES.

The lens looks good now but would love to know is there anything one has to be careful when dismantling these lenses besides being careful and writing each step down. Did you re grease it and I gather you cleaned the optics. I have quite a number of Canon lenses but never been game to pull one apart. Practice I suppose. I do have the tools and am used to small items and screws as I am an Optical technician. Any hints would be appreciated such as cleaners used, lubricants and tools if special. May just fill my day in by cleaning one of my lenses. Cheers Peter
 
Hello.

At this point I do not have in project to put online methodology for lens dismounting. (and I need to keep some secrets for my business to live ! 😉)

But with logic, patience, you will be able to do it as I did with good mechanical knowledge. NEVER FORCE ANYTHING !

Some typical haze can be caused by different things :it can be because of old lubricants that has left residues in evaporating, but it can be coating itself that has changed in an hazy and hardened material...😱

Problem with lens cleaning is that sometimes it removes the coating. Be aware of that ! Never try to use solvants. Always use lens cleaner or pure ethylic alcohol. Always use a soft cloth for inner surface coating as coating is softer here.

Some early coatings (war and immediat post war) can easily be removed even with lens cleaner (Early coated Kodak Ektar for exemple about 1942-45)

Peter, Canon RF lens has 2 main type of focusing mechanism. The one for wide angle and normal lenses, and the one for the tele. But there is not one method. Sometimes nothing goes right, and all is tightened so hard and filled with corrosion...🙁

For the SK in particular, he lens had to be heated to dismount the front lens element, then beaten with of piece of soft wood on the external side for I was able to unscrew it.

Tools needed are spanners, good screwdrivers, and some that you have to make yourself (or order by a skilled adjuster) to match the original factory tools.
 
There was another early Seiki-Kogaku 135/4 in ebay, S/N 4459, ebay 260169659148.

It was started with 9.90 USD but obviously the seller got a clue what it is later.

So it was early ended by the seller eastwestphoto( 2477) by cancelling all bids.

These kind of sellers should be immediately banned by ebay.

---

Übersicht über Rücknahme von Geboten und Streichungen
Bieter Vorgang / Erklärung Datum des Gebots und der Rücknahme
eastwestphoto( 2477) Gestrichen: US $22,50
Erklärung: The seller ended the listing early and cancelled all bids. Geboten: 12.10.07 15:13:40 MESZ

http://offer.ebay.de/ws/eBayISAPI.dll?ViewBids&item=260169659148&ssPageName=STRK:MEWA:BIDN
Gestrichen: 16.10.07 16:31:44 MESZ
 
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Seems doubly stupid, since so many things are started low and end up at a respectable market price. I've started some things that way, knowing I would get action, since I had a string of auctions.

I agree that canceling auctions is a bad practice. I've had it happen to me when there was no action, and I was the only bidder. I've had it happen from the seller end, also. You take the beating, and it's usually offset by the other lots you sell over a period of time. It is tough, selling a $25 item for 99cents, but it's also the ethical thing to do.... sorry for using the "e" word, it does seem to be a rarity on eBay. But then again, so many things are "rare" there...😀

Harry
 
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