Cosinon 135mm f/3.5 M42

[rukmeister]

Weather has been terrible here lately. Hail all day a couple of days ago brrrrr

So I've been stuck around the house with not much to do, so I thought I'd make a start on posting up some lenses.

This Cosinon 135mm f/3.5 preset in M42 mount is a bit soft. Has a 10 blade iris and has a nice smooth bokeh and circular oof highlights. Pretty soft wide open, sharpens up a bit stopped down, but isn't much good for anything but "middle aged lady" portraiture

Not the best lens, but posted here for info purposes anyway.

Sorry, taken on a crop sensor 1.5x
Tripod mounted, shot at iso 100, in camera NR turned on, no sharpening and only white balance adjustment in post using a grey card.

[mo]

We have had lousy weather here too
A nice little lens you have... I have a Titar branded lens that is almost the same except green numbers instead of yellow an O-C ring instead of the double aperture ring,A pineapple rubber grip and a T mount that looks like it would suit your lens Is yours a T mount?And it has Ten blades...I was wondering who may have made this lens.
A great lens report by the way

[rukmeister]

You know, I never really had a close look at the mount, but you made me curious so I took a proper look. It isn't a T mount, and in fact, I don't think it was originally M42 at all.

It looks like someone's converted it. The mount detaches quite easily, you can see 2 of the 3 screws in the picture. Thing is those screws don't screw into anything in the lens itself, they only "grip" an inner ring that definitely looks a bit rough and hand made. The custom inner ring looks like it is attached to where the previous mount was originally.

How about that

Thing is, it is the easiest lens I have to attach/detach because of the way the mount has a grip. I always get a bit nervous with other M42s pushing pulling the focus or aperture ring to get 'em on and off.

[woodrim]

Finally, an exception to the rule.

[mo]

There is always a surprise waiting in the world of lenses Is there a chance of a photo showing the odd mount and what's underneath?

[-halli-]

That lens looks almost identical to my M42 Sunagor Series 1 135mm f2.8 !

[rukmeister]

I'll try and get some pics of the mount assemble done today (missus is going away for a few days and I'm stuck looking after our 4 month old girl by myself -eep! )

Halli, do you reckon you could post a pic of your sunagor, I'm very curious about this 135mm now..

[-halli-]

[ManualFocus-G]

That inner ring is part of the t-mount If you put the M42 bit back on and screw the screws in really tight, the mount and the inner ring will come off together, revealing the t-mount. Failing that, use an adjustable spanner to get the inner part off. Plenty of us have had this issue

[rukmeister]

yerrr, it is kind of a t mount. Let me clarify. It has a T mount attached, but I doubt the lens itself was originally. I tried to get some shots today, but I can't get the right angle to show what I mean.

The inner ring isn't solid metal, or rather I should say not just metal. It looks like someone has used some sort of cement like substance to build up what is underneath, then sanded it back to make something a bit like a T mount inner ring. There is one spot where the screws have scratched back some of the "cement" and I can see some metal underneath.

On another note, I forgot to mention before, min focus distance is like ~3metres! Which I thought was a little far for this focal length. I keep forgetting to check infinity, might do that tomorrow if I have a chance and see if it is off at all.

[-halli-]

[-halli-]

Pics straight from the camera, resized with no sharpening or colour/contrast adjustment.

I'm new to this MF stuff, and my new prism viewfinder screen is messing with the metering too - so a lot for me to work with!

All wide open, unless stated

1.


2.


3.


4. f2.8


5 f5.6


6. f11


7. (click)
f22


f11


f5.6


f2.8


8.






others here

[rukmeister]

There is a bit of a resemblance to them isn't there... mine is a 49mm filter thread though, if I'm reading it right yours is 55? But that face plate ring does look very similar. Thanks for posting those.

[-halli-]