First check that the files are all JPEG and that you haven't inadvertaently switched to RAW, which will need the appropriate program to open them.

If all is well in this respect, then Google for recovery software and there are lots of free options.

Lens now sold, payment pending.

Bulk. The typical example would be the 16-45mm vs the 16-50mm. The latter is bigger and heavier and takes up more space in a camera bag. As much of my photography is in the field, I appreciate compact kit to carry. If there's money to spare in this equation, I'll go for a backup K7 body to add to the kit.

It can be very off-putting for those starting out to receive a bewildering barrage of advice, and also to come away with the idea that digital photography is going to be an endless and expensive upgrade path.

The point I was making about not needing the latest, best, most powerful is to reassure those beginners that whatever off-the-shelf laptop or desktop they get from the High Street will operate Photoshop perfectly well. If possible a better screen will be more relevant, and they can see that for themselves in the shop.

We know that those who want better than that are free to buy it as they wish, as are those with specific requirements. But they do have the advantage of already knowing what they need and what they are doing.

1. Pentax 100mm Macro, WR version if possible.

2. K7 Body plus 12-24mm, 16-45mm, 55mm, 55-300mm.

When set to "A" the lens should work without any problems whatsoever, so clearly something is amiss. I would check that the aperture is closing down pproperly - with the lens off the camera, operate the aperture stop down lever on the back of the lens. Does the aperture move snappily or is it sticky?

If sticky it will over-expose and it leads the diaphragm cleaning.

I quite often go to these and spend many happy hours browsing through old junk, new junk and some good stuff as well. There are bargains to be had, but things need examining very carefully.

Don't forget to haggle mercillesly and watch your bags and wallet whilst you're doing it. There are routinely pick-pockets at these events.

Unfortunately can't make this Sunday's event, but hope everyone who can finds something good.

I think it was the person you don't want to buy any lenses from...

Just like a desktop, graphics cards can be integral or separate. Of course for Photoshop you don't need an ultra-fast gaming graphics card, hence my reference above to new cards and processors not being necessary.

After all Stefan, you are using Photoshop right now with much lower specification hardware than you are contemplating.

Upgrading is a path that means you will always be one step behind. We tend to be many steps behind as we upgrade infrequently. The latest upgrade we expect to last for the next 5 years at least. The last one ran quite happily for almost 7 years.

Just be careful that the incorrect aperture readout isn't because of the inherent nature of the Sigma lens. Many of their lenses report wrong apertures or even descriptions as they are using outdated chips and reverse-engineering. This "fault" may be something the seller could know nothing about.

As for dismantling damage, that's a different issue.