Thats a 28-90mm not the 24-90mm.

Strange, I was asking myself the exact same question this afternoon and it came down to the same 3 lenses.

At the moment I am leaning towards the Pentax prime matched with my Tamron 1.4X MC4 teleconverter as I don't particularly need the 100-200mm of the Sigma f4 and I'm not too sure about the last 100mm on the Bigma.

My PK mount cost me £10 on Ebay incl delivery, they normally go for a little more but nowhere near the price of the PK/A

Adapter is actually worth a lot more than the lens.
I have 3 of the PK/A mounts (and one PK) and wouldn't part with them as they are all in use but I would say the adapter is worth around £60 and the lens half that if you are lucky.

Sent him a message asking for proper photos.
Reply:

Hello,

I have had 12 replies on the first day i have put this on gumtree. Obviously i am happy about this but feel maybe that i should have put it on for a little more money.

Are you all willing to bid for it? ie offer the best price you will pay?

I don't want to put you off as i need the money to buy a printer but as you can imagine being a student - every penny counts ! Hopefully i could maybe get just a little more money and be able to buy a better printer ...

Let me know what you think - i can meet you in central London and you can see the lens and i can send you photos.

If you only want to spend £200 - you should say so too - as if you all say only £200i will have to sell for that amount.

Alastair

Oh, I thought it was Clarky.

Well there you go then, ask Matt.

I have a Tamron AF SP 24-135mm f3.5-5.6 which I find excellent as a walk about lens but I have heard good things about the Pentax SMC-FA 24-90mm.
Maybe there is someone on the forum that could let you know what they think?

If I was anywhere near there I would snap it up.

Crikey ... stealth bombers.

That may have been true a few years ago before everyone was online but I'm not so sure now.