Flash memory cards are not the best option for long tern storage as they may eventually become unreadable. Although the memory is non-volatile for all normal purposes it isn't actually permanent.

Apart from possibly Police surveillance I can't see any need for ultra-high ISO.

The Pentax 645D would be much more interesting at these sort of price levels.

Alas, it was a Sony picture....

That's OK, I'll move it to the Lenses section.

I would forget the flash and use a fast prime lens (such as the 50mm f1.4 or f1.7) with a wide aperture and high ISO as needed.

Inside a nightclub I would be looking for colourful, dynamic images that retain all the atmosphere rather than sharp but sterile flash shots.

It does depend though on your photographic style and what you want from the shoot.

Hello and welcome.

Sigma don't pay Pentax the licence to be given all the data they would need for their lenses, so they "reverse engineer" to make their lenses work.

This means that an existing Sigma lens may not work on some future Pentax body and may need to be re-chipped. Where we stand now is that some older Sigma lenses may show up anomalies when used on current bodies. Faulty EXIF is one example of what may happen.

Yes, welcome!

I'll look forward to seeing some images of the Isle of Lewis. We were on the Isle of Skye a couple of weeks ago, so not that far from you as the crow flies!

Sharpening is a minefield of information, but good advice is found in Martin Evening's books.

Many people turn off the sharpening in the RAW converter and as a general principle (keeping things very simple) sharpening is done as the very last stage in Photoshop. Different sizes of print and different useages such as Web need different amount of shapening. As do different resolutions of sensor.

Assumning 10 MP or more, try simple Unsharp mask, Radius 1.9, Threshold 3, and using the following as starting points. Web use at 1000 pixels wide, 50% Print at 300ppi at A3 100%

The Lab method works but is getting a bit unnecessary now. There are also High Pass techniques and Blending Mode techniques. Then of course our very own Mattmatic's "Sharpen-o-Matic" just to name a few.

Finally, +1 in camera to sharpening can help as well.

If submitting to fotoLibra, do not sharpen at all in Photoshop. Sharpening in-camera is allowed.

OK, now we have defined the terms, so the answer for me is "it depends" so, for example, if you happen to photograph the first Martian landing on Earth then content will be the major requirement. There still has to enough form though to make the image intelligible.

For most images I don't think you can say one is more important than the other, not if you are aiming at a quality image. Amin's smoke images can be quality images both in content and in form, because of the reaction they invoke in our imaginations. I would not trivialise their content in any way, even though without good attention to form they would not be any good.

You need to have the technical ability to be able to reliably create images that convey the message.

My conclusion is that the question is paradoxical and has no real answer.

Before I vote, can you define what you mean by content and form?