No problem.

Sadly a little low I think but £350 collected would be acceptable.

Always nice to find a bargain!

What I mean is that I agree that the tonal balance would be potentially incorrect, but we could ignore that problem and process anyway.

I'm not sure what the effect of that would be, but it might be acceptable for some images and less so for others.

As Nikon made the statement we can assume that they meant it, that there was increased resolution in black and white and that they had countered this problem in some way.

I'm just speculating as to how the problem was approached.

Stefan, you're absolutely correct about the colours and sensitivity, but it could simply be ignored, or the processing could get very, very clever indeed and compensate.

I suspect the latter thought would take a huge amount of processing power!

The number of photographers with a 600mm f4 lens has never been more than a handful, almost all professionals. They were (are?) made to special order and had a very special price tag!

You could simply take the brightness value of each pixel and ignore what colour it was underneath. The sensor only sees black and white anyway and interpolates what the colours should be.

You can do anyone a favour but we do need to remember this is the Pentax User site.

With this sort of thread that gets easily forgotten.

So why can't you ignore the colour filter and just take the luminosity values of each pixel?

In any event, I can only tell you what the manufacturer claimed.

Sorry we don't advertise Nikon on Pentax User!