what is the cheapest LTM 28mm lens you own?

The obvious choice is the Voigtlander 28mm f3.5, which is a great lens, especially with the cropped sensor of the Epson. Small, well-made and nice optics.
 
Industar 69 works with LTM adapter but needs a modification to focus correctly. Mine cost 20$. Note that it is not coupled to the rangefinder.
 
There is the FSU ORION 28mm f:6.0, which I bought for $75. It's a derivation of the Zeiss Tessar, a 4-element design. If you can live with the speed, it's very satisfactory.
 
found an industar 69 28/2.8, can it be used on my R-D1 with adapter?
looking for a 28mm lens for my R-D1, any suggestion for low budget user?

From what I understand, the Industar 69 is a half frame lens and have a different back distance to the film plane. In order to make it focus correctly for a R-D1 you have to file off about 1mm of the mount. Also because it's half frame, it'll vignet.

Some details:
http://hamishgill.blogspot.com/2008/11/modify-industar-69-for-use-on-epson-r.html
 
just read how to modify the focusing of Industar 69, but really not sure which part should I file? could anyone advise and give some tips?
seems I will take the Ind 69 and try the modification.
thanks all of you !!
 
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