Great shots Gary!.... I'm not a football fan so you
know a lot more than I do

I can't understand why you kept the card after
it happened the first time Get the scissors
out and cut it up!

I doubt it .... a thinking head might!

Get a box such as Cornflakes box, asprin box etc. and practice
focusing just by getting the writing on the box sharp enough to read.
Try to include something with writing on it in your photos.

LV magnified to 8 or 10X is the most accurate, but still not
spot on.

Looking at the original of the grebe it looks OK.... just
needs a bit of sharpening.

I wouldn't think there was anything wrong with the lens.

Now is the time to buy path salt/grit at a bargain price!

Grebes are sometimes soft because of all the water on their
feathers and the beak isn't always in focus.

John can't buy one..... because he would have to buy
a Canon focusing screen to use with it

The Pentax-F 1.7x is called an AF adapter not a TC although it
sometimes gets advertised as a TC.... If it looks like a duck,
quacks like a duck..... it is a duck etc.

The Manual can be downloaded from:
http://www.pentaximaging.com/support/download-details/275

It's quite a bit out of date 1987 I think

I've got two of these and if anyone wants the spare one
I'd be willing to sell if for £250 + post at cost.
Excellent condition, but no case, although I can
find one off another make of TC.

I've also got a spare Pentax Rear Converter-A 2X-S

£75 sounds about right