C.Friedrich Munched Corygon Anastigmat 7.5 cm 3.5

jamaeolus · Expire: 2015-08-20

Rescued from a dead folder (Certo Dolly) exposed to moisture, the bellows was ragged, film compartment rusty, Prontor shutter quite pretty, but inoperable. The lens? It was covered in layers of gunk. Significant elbow grease and judicious use of lime away cleaned the worst of the rust off the glass. The diaphragm worked! I had to drill the mounting pivots because the jam nut was corroded to the flange. Blue tak to a pixco helical m42 nex adapter. I don't think it is too bad for a 90 year old, 10 dollar lens :

Sciolist · Expire: 2021-04-16

Lovely sense of a 3rd dimension. Sumptuous frosted bokeh. A labour of love that has paid some back. I wish I had the ability to revive and adapt lenses like these. One day maybe.

I've waxed lyrical here, but the rendering is right up my street. Nicely done Like 1

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GoldMark · Joined: 21 Aug 2012 Posts: 185 Location: Germany

pdccameras · Expire: 2014-08-11

Great save and wonderful images. The bokeh is very creamy.

To make the lens mounting a little more secure to the helical, I have found that M42 body caps like these plastic ones (75 cents each on Ebay) Click here to see on Ebay work very well as lens boards. Simply bore a whole in the center with a drill insert the lens and secure from the back with the lens retaining ring. If you have no retaining ring, bore the mounting hole a little smaller so the lens fits a bit more tightly and use a dab of hot melt glue to secure.

It's great to be able to give a new digital life to these older lenses that may otherwise just end up sitting on a shelf somewhere.

Sciolist · Expire: 2021-04-16

Lightshow · Joined: 04 Nov 2011 Posts: 3670 Location: Calgary

Nope, complete garbage.... I'll give you $10 for it. Wink

Nice results, worthy of a more permanent mount.

jamaeolus · Expire: 2015-08-20

I was originally going to do lens cap approach but the jam nut is so corroded to the threads that even after a few days soak in light mineral oil (3 in 1 oil) it wouldn't budge. Blue Tak is quite useful for these quick tests. Mounts pretty well for smaller lighter lenses and leaves no permanent residue.

alex ph · Joined: 16 Mar 2013 Posts: 1550

Great result, Jamaeolus! Congrats for this find and your ingenuity to adapt it.

I like very much the natural, pure colours. I imagine that comes from the lack of coating. I sometimes noted that "trustworthiness" of old lenses which might be very imperfect as for their other parameters.

Lightshow · Joined: 04 Nov 2011 Posts: 3670 Location: Calgary

jamaeolus · Expire: 2015-08-20

I will try that. It appears to be a triplet.

Gott23 · Joined: 10 Dec 2018 Posts: 250

The colours and contrast on that are beautiful; almost painterly.. Definitely looks like it was worth the time and labour!

jamaeolus · Expire: 2015-08-20

Not that hard really. The most time was spent trying to break loose the jam nut (unsuccessfully!). After I decided to drill the pivots I made a really thin gasket of blue tak and stuck the lens firmly to a m42-m42 helicoid, the thin one, and screwed that into a pixco nex m42 helicoid. That gave plenty of focus adjustment capabilities. In this configuration the lens is extremely prone to flare and washout if there is any light source in the background of the image. The pixco has issues with this as well so the combo with an uncoated lens is just horrible. I did have to remove the tiny tiny screw that the lens used to lock the front element (which has 2 glass parts) at infinity then unscrew the lens and take it apart for a thorough cleaning with isopropyl. It did have quit a bit of dried rus on it which I use a bit of "lime away" (the cleanser used to remove mineral stains from showers and sinlks). The back element just unscrewed from the shutter barrel. One of the trickiest parts was keeping the shutter open but allowing the diaphragm to work. I tried a dab of elmers but it didnt stick well enough. Finally jammed a tiny bit of a toothpick and that was enough to hold it open. Usually you just set them to "B" and rubber band the shutter open or use a cable with a locking collar but this one just would not function at all. Anyway it was a fun little project and the images coming out so nice was a great bonus.