Hi there, first post in this forum! I am happy to join this little community.
Over the last few weeks I have upgraded my kit, originally consisting of an M2 and a 50mm Summicron v.3, with these two gems:
A Canon 35mm f2.8 LTM in very good condition and with pristine glass for 100€ (plus 50€ for the LTM adapter). No Hood or finder, though.
A Nikkor PC 8.5cm f2 LTM with the corresponding Leitz 9cm adapter for 170€, again without the original hood or finder.
I am very happy with both deals and throughly enjoy the Nikkor on film and digital. It is sharp enough wide open and has a dreamy look, although the Bokeh can be a little nervous at times.
The Canon was the cheapest possible 35mm lens for my Leica (the Jupiter aside). I do not expect wonders of it but it feels very nice and will serve my purposes just fine for the time being.
The only pain I have with these is the fact that I have now entered the realm of non-conventional filter sizes (and threads!) and a lack of aftermarket lens hoods. For now I use a Canon T-50-2 on the Nikkor (so there is some blasphemy involved in all this), which slides onto the Vivitar Skylight filter in place (but does not fit the barrel of the lens). The filter is scratched, but new filters in 48x0.5mm are scarce. The hood takes Series VII filters, so I might take out the glass of the Vivitar filter and insert 49mm filters into the lens hood.
For the 35 I have no filters as of yet, but there are some old stock Heliopans on ebay that I might acquire. Funnily, the generic 39mm lens hood I had lying around slides onto the barrel quite nicely. This gives me enough protection for now.
I will definitely post images in the dedicated threads for these two lenses.