Originally posted by biz-engineer Advantages and drawbacks, like for everything. The pentax K outer contacts are made shallower to avoid risk of external damage which leave less room for mechanical play on the mount. But the advantage is that the contacts are very easy to clean without needed to risk introducing dust inside the cavity. Works very well for me.
X 2. I've never had any problems with either the old Pentax M42 screw mount or the K bayonet in 50 + years. Touch wood.
They've always worked for me.
Strong like bull...as we used to say on the farm.