I would just say that quoting me and adding bold to some words does actually change the meaning of the quote, so the original is the accurate representation of what I was saying. Why not bold the "should" as well?

You may well be right Dan.

As far as I know, all makes of digital SLR suffer from this.

Can we all stay at your place Clarky?

If the focusing screen or the mirror were out of position all your images would be out of focus with all lenses.

It may be that this one lens is not hitting the focus point properly because of a slight error in the mechanics of the lens.

It's interesting that it's only become an issue relatively recently. How come we never noticed this with our film cameras?

I wonder if it's something to do with the more critical depth of focus issues with the smaller APS-C format. The smaller the format the less error in the positioning of the sensor/film is permissible.

This is where the 110 cartridge fell down, because film plane position was very sritical and the 110 cartridges were not accurate enough and had no pressure plate.

Depth of Focus relates to the amount of error possible in the focusing of the image on the film/sensor and is quite different to depth of field, which is what we normally discuss.

I was just wondering if the lens itself had become faulty. We have a FA 50mm f1.4 and focusing has never been a problem with either of out K10D cameras.

When you tried the zoom lenses at 50mm it only proved that the zoom lenses focused OK, which doesn't tell us anything about what the 50mm lens is doing.

It's 100mm every time for versatility.

The 35mm Macro does indeed look attractive, but it's similar in coverage to the 50mm ones on film and unless you are copying lots of documents a bit on the short side for me.

We should all meet up and I hope that one day we will.

The K20D will enable you to set the focus for the one lens and keep that setting just for that lens. The camera will in fact keep the settings for up to 20 lens types.

Don't forget though that the slight error in focusing that you observe will be insignificant at normal distances and smaller apertures. It will only really be an issue close up and at wide apertures.

It would be interesting if you could find another 50mm lens to try out.