I recently purchased the Oly 50-200 SWD (4/3 mount) and immediately I recognized many similarities to my Pentax 60-250.
- Front element looks exactly the same
- Same girth
- Same filter size
- Same length and weight
- Oly is 16 elements in 13 groups, Pentax 15 elements in 13 groups, Both have ED glass elements
- Both have ultra sonic motors
- Oly is 2.8-3 5, Pentax is F4
- Oly manfactured 2007, Pentax manufactured 2009
Although the Pentax is said to extend to 250mm focal length, it does not (I've been told its focus breathing). From my tests its about 200 to 210MM. I have not tested the wide end. Im waiting on my adapter to be able to take some test shots.
Last edited by Lmcfarrin; 05-14-2020 at 05:07 AM.