The 67 and 645 adapters will allow the use of these lenses on K mount SLR bodies. They will be rather big compared to 35mm or Digital lenses, but not too bad as Pentax lenses are quite compact anyway.

On 35mm cameras they will act as whatever focal length is marked as, for example, a 75mm lens remains exactly that.

On a DSLR the magnification factor will be 1.5x in the usual way.

As regards quality, medium format lenses do not have resolution as high as 35mm lenses (they don't need it as the amount of enlargement needed for a given print size is not as great) but on the other hand we would only be using the centre part of the lens image circle, so that will help.

Hope that helps!

Not a thing so far...

Available from Amazon for pre-order:

"PIP Expanded Guide: Pentax *istD, *istDS and *istDL"
Cliff Smith; Paperback; £14.95

I've ordered my copy - looks like it might be interesting, and it's a further indication that slowly but surely Pentax is getting back into the action.

Buy a copy of AMATEUR PHOTOGRAPHER and you will find lots of adverts from second hand dealers.

The other major source is eBay.

Jessops have stopped dealing in second hand gear, but there are plenty of dealers who do.

There's nothing wrong with the *istDS and we'll be keeping ours for as long as they last.

It will take the 10.2 MP to start to tempt us....

So you're going away - do you take all your kit in a huge bag, or maybe a reduced kit that's more manageable, or maybe only a small compact camera on a belt pouch?

Is your holiday a break from everything, or a photographic trip that is an opportunity for new images?

My Great Great Aunt's Daughter-in-Law used to stroke Bees all the time. They would quite happily sit on her hands and endure this, or maybe they liked it, and they never once stung her.

Personally, I am not going to try it.

When I write my Novel, no doubt people will say "You must have a really good Word Processor!"

Actually, that may never happen....

Welcome to the forums, glad to see you've found threads to join in already!

Channel MIxer is indeed the most effective conversion - greyscale on its own renders colours that are different but the same brightness as exactly the same, which is not helpful and gives flat results.

There is in addition a quick way to evaluate the R, G and B channels. Select channels in the dialog box bottom right of your workspace (assuming the default position) and simply click the channel you want to look at. If any of the channels is what you want then just go Image>Mode>Grayscale and it will ask "Discard other channels?" to which you say yes and you ens up with the one colour channel as a mono image.