Trying one out will be cheap enough.

Film isn't good one day (the expiry date) and then no good the day after, it's a gradual deterioration and the date on the box is the date the manufacturer takes resposibility up to. After that, the film may be fine, depending on how it has been stored. Or not as the case may be.

But definitely worth a try - I've used plenty of out of date films older than the ones you have.

No need to get excited chaps. There's room for all opinions here.

Well, correct or not, whatever happened to having a close relationship with a supplier where problems would be dealt with because it was to everyone's mutual benefit.

If we rely purely on the letter of the law I think it diminishes the spirit of good business principles. Companies often exceed the requirements of the law to maintain goodwill.

Don't get confused - aperture will indeed affect DOF. Small apertures may well be especially needed for close up subjects.

Very small apertures will start to reduce quality through diffraction, but don't let that put anyone off using them when necessary.

Think around magnification. If a subject is recorded at say a 1:1 magnification then the DOF is controlled by the aperture, but it doesn't matter what lens you use - 50mm or 100mm macro will give you the same DOF.

Well, congratulations!

Now you've made it, what are your plans?

Darkroom paperas are available a multi-grade )you will need a set of filters to get all the grades from the one paper) or graded. The usual objective is to get all the tones you want correctly onto Grade 2.

Glossy finish will give you the widest range of tones from deep black to pure white. Pearl can be very nice for portraiture. Matt can look quite dull but I do like it for portraits and nudes.

If there's nothing wrong with a product it's indeed good service to get a refund.

Now the supplier has a second hand camera and has lost quite a bit of money. Did you not buy the K10D from them?

It's not really possible to see with the naked eye whether or not there is any residue. You are actually only noting that there is not the same kind of residue that you get with the cleaning fluid.

If cleaning fluid leaves a residue I wonder if that's because too much was applied? I thought the applier had to be only slightly dampened and there should be no free liquid at all.

Yes, A3 prints is what I had in mind.

I'm glad you mentioned DOF because at these close distances it becomes relevant that DOF actually depends on magnification (distance is the normal way we view it) so if an object ends up the same size in your viewfinder the DOF for the 50mm and 100mm lenses will be the same. This is because the 100mm is twice as far away to maintain the same degree of magnification.

What will change is the viewpoint and this will change the relationship between different objects in the view.

Generally, 100mm macros are more useful.

You need to activate the custome function "permit use of aperture ring" and then you meter and take the image in manual mode using stop down metering. Not the most convenient way to shoot but it works.

For more convenient shooting and full function buy AF Pentax lenses or A series manual focus ones - there is an A setting on the aperture ring with these lenses.