Hi together, i am looking for a speed booster adapter and use it with a manual/vintage 24mm prime lens to get ~35mm equiv. angle of view. I'm totally satisfied with my konica ar 40mm. Unfortunately there is no speed booster adapter for AR > M43. As I was looking for some 24mm prime lenses, I often found Canon FD or Minolta MD mounts. So what would you recommend? "The" 24mm (<= f/2.8) for this mount would be the key lens for my decision. But I would also take a look for some other focal lengths. Question: Are Vivitars 24mm f/2.8 the same - just with different mounts? Or are there any differences between them? Please recommend me a mount for using a speed booster and a manual 24mm prime lens, that have a quite good quality.