Noob Question Help (lens adapter)

[fromdecember]

I have the Blackmagic 2.5k MFT and MFT->EF metabones speedbooster.

I purchased a Rokinon 14mm 2.8.  It says "Compatible w/ Full Frame & APS-C Cameras.  Compatible Brand: Canon.  Mount Type: Canon EF"

But it won't fit on my speedbooster.  What am I missing?

[AlexTrinder96]

Hmm, not sure tbh! Can you post some pics of the lens and camera? 

 

Was the lens bought on Ebay?

[webrunner5]

Have you used any other lens on that Speedbooster?? If that Rokinon is designed like a Canon EF-S lens it is not going to work.

[mercer]

Was the lens used? If so, then it’s probably a different mount lens in an EF Mount box... if I had to guess.

Post a picture of the lens mount and we can probably figure it out. Or the mount type may be stamped on the bottom of the lens or on the rear lens cap.