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Modding the Industar-69 to the Leica Thread Mount (LTM) system.
The lens in question was made for the Chaika camera. It does have a threaded mount identical to that of the LTM lenses. However the distance to the film plane is different so you'd be out of focus using it on a LTM camera. But if you're determined to use one of these lenses the conversion is not at all difficult, which is my intention to show with this post.
Step 1: Remove the focusing ring. It is fastened by three tiny screws on the side of the ring.
Step 2: Using your digital camera, focus to 1 meter. Identify which of the two larger screws fastened to the lens body stops it to focus to infinity. This is done by holding the focusing ring in place and turning it along with the lens helicoid starting from the 1 meter marking. To find the correct starting position you align the 1 meter marking - which is symbolized by a human portrait - with the red triangle on the lens body.

Step 3: Remove the screw in question. See below.
 Step 4: Place the teensy-weensy screws back into their holes. Turn them so that they stay in place.
 Step 5: Again, align the portrait symbol and the red triangle. Fasten the three screws. You're done!
 This has been my go-to lens for several years, mounted on my Fuji camera. The removal of the larger screw also enables you to focus as close as 15-20 cm.
  Bear in mind: This lens is now a LTM/M39 system lens but it is not coupled like the lenses especially made for the Leica thread system cameras, so focusing throught those cameras' rangefinders will not work.

Thanks for reading this post! Don't hesitate to comment or check out my Instagram at #ourbooksmalmo. Visit my Etsy shop getOurBooks where there are cameras aplenty to choose from, along with this lens!

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