Most successful speed-boostered lenses?

[squirrel$$$bandit]

…also, the introduction of the X-mount Speed Boosters is tempting me to return to the world of adapted lenses, lord preserve me. Which ones are you all getting good results with? Most likely I'll wait until the Pentax one is produced, as I'm very nostalgic about getting to use Pentax M and M42 lenses in "full frame"—but the present line is rather enticing.

 

[jsrockit]

I was really ready to try the Leica R one, but then noticed it said the 50mm Summicron R would need to be modified to be used. However, I couldn't find what the modification required would be. A Pentax one would be cool.

 

[GaryLH]

Wish they would make one for Nikon....

Gary

 

[zuikologist]

Wrong forum, but Nex 7 with lens turbo plus Pentax smc-m 50/1.7 works really well. I'll post a shot when I have some time.

 

[YYV_146]

From what I've heard moderate focal lengths work much better than superwides and telephotos. I had a chance to test a NEX speed booster with the Canon 24-70 zoom. Fairly impressed by the performance, but not worth $600 for me.