Have You ever made good or bad experiences with mount adaptors for the X-E1?

Hello everybody!

Have You ever made good or bad experiences with any mount adaptors fuji X body to Nikon or Leica M lenses? There are very cheep chinese products but also expensive fuji or novoflex adaptors. Is there a significant better working or IQ with the more expensive adaptors?

Thanks for your help!

Daniel

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Have always fun with your x-e one