Cheers for that.

Well, reading about Tamron TC's, i havent yet found the definitive answer. On old Tammy brochures, available to view on the Adaptall website, they reckon a Tam TC is best over 90mm. Yet they also state some particular lenses are ok with a TC. EG, the later version 70-350 05A of the lens i'm after. Presumably it has to be used at focal lengths over 90mm but they dont mention this bit. The previous 70-350 model i'm talking about, has no mention of compatibilty with any Tam TC.

Noted Andy, thanks.

By the way, the Adaptall website is working again, and although looking for my lens is a link to elsewhere, it appears to be working again

http://translate.google.com/translate?hl=en&sl=ja&u=http://www.tamron.co.jp/data...

I would have bought this off you - only just seen it

Andy, thanks bud. Yup, i'm with the program on degradation etc. I read and read and keep reading as much as poss all round the net re. Pentax cams and lenses and TC's etc.

I was thinking perhaps that i'd keep the TC down to a 1.4x so as not to lose too much, but the minefield of TC's out there has me foxed, especially the several Tamron models, and whether to choose a Tamron or something else. I presume only Tamron TC's will fit a Tamron lens ? And presumably they go inbetween the K mount adapter and the lens ?

Hi ttk, only kidding. This place looks great. Thanks for the welcome mate.

Pete

A lovely welcome, so thanks for that Pentax people. And thanks for that link Robin, very useful.

I know Wantage fairly well. Its a nice town Gwyn. I'm not far from there myself - Witney.

Actually its F4.5 constant .. !!

And i think this post might be in the wrong section, but the only other place i saw was Pentax Lenses, and it isnt about a Pentax lens ?

Confused already !

Hi, just joined the Pentax zoo, just bough a used K10D and my first question is about Tamrons. I have been offered a Tamron 70-350 F4 constant ( its the model before 05A ) If the Adaptall website was working properly, i could post the exact model, but its glitched at the moment.
Anyways, i was wondering if i could use a Tele Con with this lens. Should i only use TC's with a prime lens ? There appears to be several Tamron TC's and i'm getting confused on which is the quality models, and which would or would not work with this lens.
For example there are SP x TC, F system , Non SP standard, so its a bit tricky to know where to start.

Howdy - just taken the plunge and bought a K10D body, and have my eye on a few lenses, but will obviously need help with plenty of stuff.
First pro DSLR after years of using pretend DSLRs like Panasonic Lumix FZ20 , Fuji S5600. Can only afford older used lenses, but i'm ok with that.