lenses for k5 issue

being on a restricted budget I have purchased 2 lenses now on ebay( the dreaded I know) both advertised as K mount for pentax,
having checked the manual for my K5 it says K mount lenses will work in manual mode, happy with that I proceeded but both lenses have printed on them PK wich I believe is a totaly diferent thing, niether will work on the K5 and the one will not even fit.
lenses are Vivitar 75-300 4.5-5.6 macro £29.00 K mount (does not fit)
Makinon 500mm f8 mirror lens £46.00 K mount. (will not work)
have now ordered smc P DA 55-300 4.-5.6 £170.00 hope this fits.
Ok I can just re list the lenses but it now leaves me in confusion as to what lenses will work with the K5, all my super A lenses work fine.

PK IS Pentax fit mate. PK can also be seen on the caps of sigma fit glass which would ALMOST fit which could explain the vivitar.

I'm sure you probably have but...

You have set 'allow aperture ring' in the menu? (You need do this only once) and lined up the 'red dots'?

Hi Rob

PK stands for Pentax K mount - if it says PK on the lens mounts (not caps)- they should work.

There are a small number of older 3rd party PK mount lenses that will not fit the K5 due to the flange on the mount being a little too thick - but I have never seen this problem on a Vivitar. Do you have a Pentax film body or know somebody with one that you could test it on?

That said - if it does not fit - do not try to force it - as you say get it back on ebay but do the buyer a favor and state that it will not fit digital.

As for the mirror lens - no reason why it would not work - most of these were made with a T2 basic mount that had the various different mounts added to them - PK etc - so if it fits it should work - so long as you have set the camera to allow manual aperture as described by Dave.

Carl

In what way do they not work?

I think this problem may have surfaced on the forum a couple of weeks ago. I recently came into possession of a Vivitar 28-200 lens clearly marked as P/K-A R-P/K on the rear rim.
The problem is that the flange 'protecting' the aperture arm is much too long and MUST be modified - whatever you do dont try to force the lens on
Cutting the flange to size is very easy; A junior hacksaw, a small fine file and a dab of matt black paint.
And it is probably better to dismount the flange before modifying......and shape to match a Pentax lens.

In passing; I recently purchased a large box of mixed (Pentax fit) lenses, some PK some M42, these included Vivitars, Takumars, Pentax Manuals and even a pair of Pentax-110 lenses. With the obvious exception of the latter and the aforesaid Vivitar, all of the lenses worked worked perfectly on the K5 (and the K10 and K20). You need to watch the pin on the Takumars though........

Roger.

Hey, thanks everyone, always thought the P was for pentax just did not alow for human error, meeee.(momentary confused stupidity)
500mm f8 mirror works fine, now I finaly found the aperature setting in the Menue (never needed it in the past),the Vivitat 75-300 however will not fit the K5 even though the mount says PK, not too troubled by this as it went very cheap,

The Vivitar could actually be in a Konica mount, or something other than Pentax K.

If you provide us with some images of the mount of the lens, we would be more suited to figure out why you do not seem to be able to get it working.
Just remember to get it in focus, and include a good view of the lever (the most important part). Crop the image to only show the mount, and post it here. I can't remember the size restrictions right now, but 800 on the long end is usually fine.

You would honestly be suprised how many different kind of lenses that can be used on the K5. Personally my main lens for landscape is a Zuiko, and for portraits it is a Leitz, go figure.