Originally posted by mrginger It's great to be here! Used to always shoot RAW on the Fuj. Never even considered converting k to M42 but it seems obvious thinking about it that this must have been vital when Pentax took over the K Mount. Time to go searching for Tukumars and radioactive russian glass!!!
Grab yourself a 35mm f3.5. A nice cheap place to start and what a lovely little lens. If you are using M42 on anything digital, it is always worth looking at preset lenses or ones with an A/M lever. 100% auto things like the Helios 44-4 are wide open unless you have a flanged adapter that presses in the pin, then, the problem is, the viewfinder is dark at anything smaller than f5.3. Have a look at auto yashinon/chinon/revuenon 55mm (5.5cm) f1.7/8 as they are Tomioka lenses and are fabulous, also, worth considering is the mamiya sekor 50mm f2. Watch some of the slightly newer Yashica M42 lenses (DX) as they can foul the mirror on K mount. One tip, you can often get someones old camera kit cheaper than buying lenses individually. Have a look at Edixa cameras as they have some interesting German M42s on board (isco Göttingen, steinheil munchen, Schneider kreuznach, e Ludwig, Zeiss). As for russians, they are mostly Zeiss copies. you must get a Helios 44-2, (Biotar) its the law, the mir 1b 35mm (flektogon) is particularly sweet, also look out for a 135mm Tair 11a or failing that, the slower but still solid, Jupiter 11a. There is also a lovely Jupiter 85mm which is excellent for portraits, just make sure you get the right version. The one that looks like a chrome toilet roll sleeve isn't compatible with M42. One final word of warning, lens buying addiction is real! There are folders containing images on my flickr account. I am not the worlds greatest photographer but it will give you an idea
https://www.flickr.com/photos/cerebum/albums