I've sold plenty of 49mm filters on ebay and there are usually plenty more on offer. It is less common as a size than 52mm these days, but still used on some Pentax lenses.

Everyone is entitled to their opinions and even if it's put in a somewhat aggressive way that's no reason to villify and be aggressively unpleasant in return. There's a point where this just becomes bullying and that is not allowed in this forum.

I'm now locking this thread, which had no need to turn the way it did.

Same as Don.

In practice, you might well get the 1 year standard warranty, but not the enhanced 2 year Pro Centre warranty. The supplier is of course liable in the first instance, so they would have to sort out a problem for you. In theory. How long it would take is an unknown variable.

It's probably safer and better all round to use a recognised Pentax dealer such as SRS, Park Cameras and others.

A grey import is one that has come into a country without being part of the usual supply channel from the manufacturer to the appointed distributer. So, for example, suppose a shop doesn't buy from Pentax Uk but goes instead to a supplier in Hong Kong. That would be a grey import.

The disadvantage of that is that it's more fiddly to do, nothing else.

It would have been more accurate to say when the Asahi Optical Co started. The first time they made something called a Pentax was around 1957 and it of course refers to the first mass market SLR with a fixed pentaprism viewfinder. (I know Contax got there first).

It is probably unwise to arrive in a new room full of people and start off aggressively.

But equally well let's not hound people over that or their opinions.

It's worth thinking about though, because any point there may have been has been lost because of the approach.

The technique is: First the adapter is screwed into the lens. Then the lens is bayoneted onto the body of the camera. The lens can then be unscrewed and another screw thread lens can then be screwed onto the body as desired. In other words, the camera body has been temporarily converted into a screw thread body.

The adapter has to be removed separately.

This is the opposite to converting a lens to bayonet, which in one way is a shame and I'd have preferred to have an adapter for each lens. However, at least the way things are is rather less expensive.

Why the 18-135mm? The more modest range than the 18-250mm gives scope for better image quality. The WR construction is very appealing. The 18-135mm range is wide enough to be extremely useful.