The 16-45mm is a better lens, but only by a whisker these days. It gives a slightly wider angle and QuickShift though, both of which could be useful.

£15 for your existing lens is probably as much as you could hope for as a trade in, but you might do better selling that on eBay or here.

The Samsung is the same lens as the Pentax, but the Pentax may well hold its value better. It also definitely has the SMC coating, whereas we only assume the Samsung has.

Well done Kirsty, a great feeling to have that success!

Not sure about this - I don't like the idea that anyone could have a list of what valuables, if any, we own.

What happens when the site gets hacked?

I've had a good look and although there are some locations that I have used several times for different tests, there are no really identical shots that show anything meaningful. Any differences have been influenced by the camera body as much as the lens.

I do think that lenses need to become aquainted with before we start to see if they suit or not. Despite MTF testing, there is still another major facotr - the character of a lens. I've had so many lenses, and just as an example, these I have really liked:

Pentax 100mm f2.8M, Pentax 43mm f1.9FA, Pentax 18-135mmDA, Pentax 100mm Macro lenses in general. There are more really, but that's a few.

These I have not liked much:

Pentax 120mm f2.8M, 85mm f2M

There are plenty of other lenses that were just fine, like my Soligor 105mm pre-set lens, but the list could be too long...

This could be quite difficult to do when displayed at forum sizes. It will take more extreme differences to demonstrate any visible effect.

It might be possible to show different bokeh and resistance to flare though.

I'll have a look, but am not sure that I have much material shot in the way you ask.

Not the way to do a Classified Ad, please just tell us how much you are looking for. Then if someone is interested they will either accept or make a counter-offer.

Which lens wasa that Dave?

Back on topic please. And again, attack an argument by all means, but not individuals.

The other thread was actually more of a plug for lenses in Canon, Nikon and Sony fit that a lamenting that there are no Pentax versions, so this thread is much more on topic.

The new Pentax 18-270mm is of course based on the Tamron lens, so it's clear that business continues to be done where both parties find it agreeable.

In a similar way, business is done with Tokina and some very fine lenses have been co-produced. Tokina supplies Canon and Nikon fits, Pentax provides Pentax fit.

The premise that Pentax lenses have always been less expensive than the equivalent Nikon ones does not actually stand up to scrutiny.

Selectively you could prove that, but in general, going back over the years they have been much of a muchness, with the Pentax version often being priced slightly higher.