I have a Rokinon 14mm f/2.8 lens with the EF mount and AE control which I normally use on my 6D MkII with no issues. When I bought the R10 2 years ago I also bought a Viltrox EF-R2 adapter. This combo works flawlessly with all my EF lenses on the R10 except the Rokinon. The camera locks up as soon as I press the shutter button. Only way to free it is to pull the battery & that's not a good thing to do. Tried it on a friend's R5 with the same results both with my adapter & his Canon one. Here's where it gets interesting. Earlier this week I was at Gene's Camera in South Bend. While my buddy was shopping I was telling a sales rep about it. At his suggestion I got the lens & and adapter from the car. We put it on a used R6 he had in stock and it worked perfectly. Also tried it with a Promaster adapter with the same results. Is there perhaps a menu setting that could be set so that this lens/adapter combo could be used? Have been looking through David Busch's R10 book and the manual with no luck. Any help is appreciated.
