Looking at my lenses atm most of them are manual focuse so I am toying with the idea of buying a Pentax teleconverter to make them auto. This would then make my favourite Vivitar macro lens auto and so it would save me having to buy a AF macro lens.
My question is can you use the converter purely as a AF adapter without the teleconverter side of things which would degrade the IQ of the lens.

Thanks

Well to put it into context I paid £80 for a used Pentax AF-360-FGZ on Ebay and from what I could see that was cheap.
The 2 lenses are prob worth around that again on Ebay so it seems a good deal to me as you would certainly get more than £40 for the body and grip were you to sell them.

Do you have the 2/5 or 2/8 90mm macro?
If it's the 90mm adaptall 2 f2/8 have you tried the 2X SP converter on it?

thanks.

If the lenses are Adaptall 2 then you need a Adaptall 2 PK/A mount so that you can use the "A" setting on them.
If the are Adaptall 1 then you can get the cheaper PK mount as I believe they do not have the "A" setting on the aperture ring.

I have a 90mm F2/8 macro and a 28mm F2/5 working fine with a PKA mount and K10D although they do seem to overexpose a little.

Am working on someone atm to let me buy their SP 80-200mm F2/8 lens.

Same here with the Nikon viewfinder.
Tried it with my sunglasses on and it is a bit of a pain but then Im not used to wearing glasses while using the camera so how much of it is down to that I don't know.

WE have a very large bit of wilderness not 2 mins walk from the house so I decided to take the dog and camera for a walk this morning.
Just took the camera and old Vivitar manual 100mm F2/8 macro.
















And one from yesterday.

Or spend a little extra and go 18-55mm and the new 55-300mm.

I bought a Ricoh macro teleconverter which fitted nicely on my K10D, worked really well but when I went to take it off it was stuck fast. Apparently the pin is in exactly the same spot as the autofocus hole and when it is disengaged (autofocus) the pin retracts in the camera and the pin in the ricoh lens drops into it.
I managed to get it off after a couple of frantic hours by engaging the autofocus lever on the camera and gently sliding a spark plug feeler between the lens and camera.
Have since bought a few more Ricoh lenses and now take them apart, remove the pin first and they are fine.
Fairly easy job and if you do a google you will find instructions.

Nice story.

Oh well, my loss I suppose