FS Tamron 55BB 500mm mirror lens
There is a spacer to prevent the lens getting jammed on a tripod mount because it does extend below the body it's mounted on.
There are two optional extras listed, a set of filters which I don't have and a 2x convertor which could be available at additional cost.
It fits in between the lens and the Pentax adapter so can only be used with Adaptall lenses.

LennyBloke
There is a note :
The SP flatfield 2x tele-converter is not compatible with Tamron wide angle lenses.
or Adaptall Canon FD, Konica AR or Topcon RE mounts.
I confess the latter prohibitions are not of great concern to me.
This 2x adapter is an 01F and seems mainly to be directed at longer focal lengths based on the instruction booklet.
There is a note :
The SP flatfield 2x tele-converter is not compatible with Tamron wide angle lenses.
or Adaptall Canon FD, Konica AR or Topcon RE mounts.
I confess the latter prohibitions are not of great concern to me.
Links to an Adaptall2 website 01F link 200F link
Barrie
Too Old To Die Young
http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/

LennyBloke
Back to the OP - that's an excellent price for the Tamron 500mm, and as it's fixed aperture the Pentax K adaptor doesn't really matter (compared to the KA adaptor), they used to sell for a lot more - but this price is at the lower end of what they tend to go for on EeekBay, but with rather more certainty of the description and seller - If I hadn't banned myself from buying (approx. 3 months now and still on the wagon) I'd be quite tempted

Oh come on, play fair! I bought one of your lenses last year - my only purchase in 2020

Sorry John, no takers here so needed to include the case in the auction.
This 2x adapter is an 01F and seems mainly to be directed at longer focal lengths based on the instruction booklet.
There is a note :
The SP flatfield 2x tele-converter is not compatible with Tamron wide angle lenses.
or Adaptall Canon FD, Konica AR or Topcon RE mounts.
I confess the latter prohibitions are not of great concern to me.
Links to an Adaptall2 website 01F link 200F link
I have both the 500mm Mirror & the 2x converter & it does indeed fit between the lens & the Lens mount, so you only need the one adaptor...you will also need something to hold it very steady...but they are a lovely piece of glass.....mine cost me much more....and that was some years ago.....
Andy
A few bits & Bobs
roberrl
Member
As the title says a classic mirror lens complete with dumb Pentax adapter.
Not everybody likes mirror lenses and the fixed aperture is somewhat limiting but I was happy with the results from my first truly long lens.
Looking for £65 posted.