Whatevere you do, don't try to force it. If you compare it with a Pentax K fit lens is there anything obviously bent or damaged on the back of your Vivitar lens?

If it were a K fit lens it would fit, and although some independent lenses don't fit as slickly as a Pentax one will, the Vivitars are not bad.

So are you sure it is a Pentax K-fitting lens? If it's a screw fitting lens you will need the Pentax Adapter K, but if it's some other bayonet fit then there is nothing that can be done.

The reason for long telephotos going past infinity is that expansion and contraction of the lens makes a difference to the infinity point. It becomes critical with some designs, hence the leeway provided.

As for mirror lenses, many of the 500mm ones are not impressive. I'd prefer a standard 500mm telephoto any day.

I reckon it's big in the frame, but not sharp by a long way.

This could be due to atmospheric conditions, shake even on a tripod with such a long lens, or the moon moving during the exposure. The moon moves very quickly and needs a reasonable shutter speed to arrest that, or a proper astronomical motorised mount for the camera.

Well worth working on though. Getting a really crisp image like the ones in Astronomy books would be quite something.

Fantastic faces on those cats. Are they moving into professional modelling?

Seriously, though, like owls, they have incredibly appealing expressions.

I use the 16-45mm almost all the time. The f4 aperture doesn't really become an issue as the ISO can be changed as necessary. I'll even do hand held night shots if the need arises. It's a brilliant lens.

The correct reply was "What's wrong with being drunk?" to which I would have replied, "Ask a glass of water..."

Ah well...

I think the babelfish sounds drunk...

Thanks, that's better!

It's fair to say though that nowhere do they actually claim to have designed the lenses we are talking about. The wording is the usual wonderful marketing-speak and the technical stuff refers to lenses that Schneider undoubtably have designed and built themselves in the days when German manufacture was the norm for them.

Now we know the DSLR lenses are made in the Pentax factories in Vietnam.

The question really is were the designs Pentax/Tokina as we thought or were they Pentax/Schneider as GC seems to think.

We may never know for sure, although I have my own thoughts on it as I'm sure you all do as well.

Well thank heavens for clarification... ...so far as I can see, and someone can happily correct me, nowhere does this advertising page claim that Samsung designed all these lenses. It says pretty much what I would have expected it to say, and a similar Pentax page could have probably said exactly the same.