I've got the 200mm brother to that, it's a nice lens with that silver finish. ( It's up for sale at the moment, I have too many long lenses )

I have my own small fridge in the utility room, the only things allowed in my fridge are beer, wine and film.

I liked Tamron many years ago, much preferred them to Sigma and the other 3rd party lenses. Then I sold all my SLR gear and went compact and eventually digital. Now, I'm finding a lot of cheap Tamron lenses, and appreciating just how good they were.
the stabilization does need to be turned off when using a support, but my Pentax K10 doesn't seem to be quite as affected when I forget - which is frequently.

Many of the 'third party' sellers such as Vivitar and Soligor never manufactured anything, they might have done some ( maybe all ) of the design and specification, but the actual making was down to the supplier. And that led to a huge variation in what the customer got.
But, that didn't let the 'first party' sellers entirely off the hook, they made as many dogs as the third party competition. I've had a few major manufacturers lenses that I thought were very average, and the internet reputation ( hindsight ) backs it up.
The third party manufacturers did have a lot of success back in the day, I've got a few Soligors and about the same amount of Vivitars, maybe a dozen of each brand, and most are decent lenses, maybe 3 of each are spectacularly good, and 1 is a door stop. How much of this variation is down to the original design and the manufacturing and quality control from a large variety of manufacturers is impossible to tell. I try to buy lenses in good condition, I'm a user not a 'polish it and put it on a shelf' collector so I don't look for 'mint' lenses, just good ones.
Most of the third party lenses I have live up to their internet reputations, as indeed the major manufacturers lenses do. I think that buying old lenses can be a minefield, as Stephen says. The age and history of that lens will be the deciding factor. I've had bad luck with 2 lenses, recently I got a Tokina 17mm f3.5 that is a disaster, utterly unusable. And a few years ago I got a Pentax SMC DA* 50-135 F2.8. I sent it back, I sent the second one back. I love the third one, it's a fabulous lens. The Tokina is an old that I was given, the Pentax was brand new and cost me 2 months wages.

Are you using a tube between the viewfinder and the digi-cam ?

These are great images, the cyanotype effect suits them. ( I love Photoscape )

A while ago I bought what was basically a mystery bag of photographic stuff for next to nothing, it turned out to be the bargain of a lifetime.
I was in such a hurry to pay the guy for the holdall, not a camera bag, of stuff and leg it before he wanted more money I didn't even look in the bottom of the bag. Then he gave me a cardboard box with the rest of the stuff !
Anyway, in the bottom of the bag were two Minolta XD7's both in excellent condition, one chrome and one black. The black ones are fetching about twice the price of the chrome. And I like it better as well, alongside each other the black one just looks so much better.
The only other all black cameras I've got of the era before moulded polycarbonate bodies are a Chinon CE5, which also looks really nice, especially with the motordrive on it, and a couple of Zenits.
I think I like all black cameras of that era, they seem to have been the minority.

Thank's Stephen, that will get this old FED working nicely.