Found this misleading listing :
olympus 28mm f3.5 Lens. *Great condition Olympus Asahi lens/ 49mm Pentax filter | eBay
Contacted the seller - this is the result :
Hi,
May I politely and respectfully point out that this lens does NOT fit a Pentax camera. Just because it has a Pentax filter attached does not make it a Pentax-fit lens. You may wish to amend the listing.
Tony
Tony,
The title does clearly state that it is an OLYMPUS lens!!
Rather than spending your time trawling through listings looking for errors where none are present, can I politely suggest that you LEARN to read and then find someone else to bother with you mundanity.
Thank you...
2caryn0n8z
Thank you for your somewhat abrupt and confrontational response. May I quote from your own listing : 'Great condition Olympus Asahi lens/ 49mm Pentax filter'. Firstly, Asahi is a registered Pentax trademark - this lens cannot be described as such. Secondly, as someone with such a great knowledge of photography as yourself must know, before adopting the OM mount system, Olympus did indeed manufacture lenses with the ubiquitous 42mm 'Pentax' thread mount - this is not one of them either.
I was merely attempting to assist you before someone believed your deliberately misleading listing and purchased this item expecting it to fit a Pentax camera, either 42mm or PK mount. No doubt if this happens you will be as polite to them as you have been to me, and will face a claim via eBay from the unhappy purchaser. You have my best wishes.
Tony
Some people you just can't help.