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VIVITAR 28MM 1:2.5 AUTO WIDE-ANGLE | eBay

This one now is still at US$1 with 5.5 days left. I have a copy of this, paid US$20 shipped; it is one of my favourite 28's. Note that this is in Nikon mount. I think it's called pre-AI -- no dremel work necessary, no protrusions to chop off, it fits directly onto a Pentax mount. Those who worry about security could cut a small notch 1mm wide and deep, 5mm long, into the lens base for the PK locking pin to engage. This is the kind of good cheap deal I look for. It can be yours! (No, I'm not the seller.)

[bjake]

Don't fully understand.Does one need a Pentax mount from another lens or can the lens be used on a Pentax as is?
Jake

[RioRico]

Don't fully understand.Does one need a Pentax mount from another lens or can the lens be used on a Pentax as is?
Jake

As-is.