Okay so I finally hit the button and ordered a mint used SMC Pentax-DA* 60-250mm F4 ED [IF] SDM lens for a good price.
I'm going through a little sticker shock and realization that I will soon have the beast in my hands.
I have loved my HD Pentax-DA 55-300mm F4-5.8 ED WR, it is light, easy to use and generally excellent IQ. But sometimes it just feels like it is letting me down. Hence the new purchase. I hope I have made the right decision...
Now to sell off enough lenses that I have accumulated in the last couple of years to pay the credit card bill
Darryl