Ricoh (rikenon) lens for Pentax

Afternoon all
I was scrounging in my local pawn shop and came across this lens
Ricoh (Rikenon) XR 1:2.8 135mm lens. It has the pentax K mount and looks very clean. I was wondering what you think of this lens and would it be suitable for my K100D. I guess for the 11bucks they want for it i cant go too wrong. Just wondering if its worth my while grabbing it thanks

Ricoh used the original Pentax K mount. When they decided to go automatic they did so by incorporating a little pin in the base of the lens, similar to that used on late screw-mount Takumars.

This pin tends to get stuck in the hole on Pentax AF cameras where the AF actuator is sited.

So, you have these choices:

go for an early Ricoh, sans pin, or
use it on an MF Pentax body, sans hole, or
remove the pin, or
take a chance.

G

Or leave the lens in the shop.

Actually, there's more choices:

Use it for macro on extension tubes, or
Use a t/c to make it into a nice 270mm. It's fast enough.

And if you use one of those cheap 1.7 t/cs you'll have autofocus, too.

G

Thanks George
I think i will try it with a Macro extender as you suggest. It shouldn't be too difficult to remove the pin i expect. Dont want it getting stuck thats for sure.
I have a manual function T/C also
Thanks again.

And for 11 bucks if it's no good for your use you should be able to make your money back on e-bay

It might actually be a very good lens. I remember hearing that the Ricoh 50mm was sharper than almost anything else, including Pentax.

G