SMC Pentax-F 100-300mm compatibility...

dcm

Enjoy the gear you have!
CR Pro
Apr 18, 2013
1,091
856
Colorado, USA
You didn't give us much to work with. It depends on the body. There are several adapters available.

RF and EF-M should work with the adapters due to the extra space, but the lens will be full manual. Manual focus aid (zebras) in these bodies can be helpful.

Some very thin adapters allow you to mount the lens of an EF. Pentax K Lenses have arms and other features that may protrude in the body. Most only recommend EF-S bodies which should have room for the elements that protrude. Modifications may be necessary to mount on EF bodies. Optical view finder on EF may be problematic unless you get a chipped adapter to allow focus confirmation. It still may be difficult with a long telephoto. Magnified live view may be your best bet with EF/EF-S bodies
 
  • Like
Reactions: 1 user
Upvote 0
You didn't give us much to work with. It depends on the body. There are several adapters available.

RF and EF-M should work with the adapters due to the extra space, but the lens will be full manual. Manual focus aid (zebras) in these bodies can be helpful.

Some very thin adapters allow you to mount the lens of an EF. Pentax K Lenses have arms and other features that may protrude in the body. Most only recommend EF-S bodies which should have room for the elements that protrude. Modifications may be necessary to mount on EF bodies. Optical view finder on EF may be problematic unless you get a chipped adapter to allow focus confirmation. It still may be difficult with a long telephoto. Magnified live view may be your best bet with EF/EF-S bodies
 
Upvote 0