Identifying lens, 28mm 2.8

[glemmy]

Hey everyone. I'm new to this forum but I've come across it many times while searching the web for information. Great resource!
Recently I got this new hobby, looking for M42-lenses for my Pentax DSLR.

Some weeks ago I purchased this lens from ebay. According to the seller it's a Chinon, but I doubt it. First of all there is no name or anything on it but the seller said it came with a Chinon camera.

There were some dust specks and the diaphragm was fully open all the time. I got it quite cheap, or at least I didn't pay so much for it

Today I decided to perform some surgery. I took it apart trying to find some sign that could identify it, but there is abolutely nothing. I tried searching google but could not find any image that exactly resembles this lens. The good news is I got rid of most the dust and the diaphragm is now working.

What I know:
The inscription around the bezel says "AUTO LENS f:2.8 f=28mm No.3628038"
On the bottom there is another inscription that says "Made in Korea".
Maybe not so much to go on but pleae see the pictures below:






edit: hmm, apparently I can't post links yet
please copy/paste

[aoleg]

The "Made in Korea" designation is a sure giveaway. Unlike Japan, there weren't that many lens manufacturers in Korea. My bet is it's a Samyang (they used to sell under a bunch of different names, including Polar, Vivitar, and now Opteka, Bower, Walimex...)

[Attila]

[lens-o-matic]

My version of this lens... It's a total dud.
It says "Carenar" on the front and does not focus to infinity...

[glemmy]

thank you aoleg! that will significantly narrow down the searches.

lens-o-matic: mine is probably not better.
I didn't have the chance to play with it so much so far but the first impression was not that good
oh well