Originally posted by Jome Just got this for 2$...
And now a need a 2nd M42 adapter or M42 mount lenses (first or all that apply
)...
Suggestion: 1) get an M42 to M39 adapter (= Pentax thread to Leica thread); 2) get a used enlarger lens* and mount that on the bellows. OR: 1) get an M42 to filter thread adapter, any size 49mm or greater; 2) reverse mount a normal to moderately WA prime lens or an enlarger lens*
*The 50mm f2.8 El-Nikkor was very popular, is available used for reasonable cost, and has a good reputation for use as a deep macro lens in normal, or even better reverse mount.
If you don't know where to get an adapter, try
1) adapterrings.com
2) Thor Labs.