Ah, I see now! Makes sense.

Under-rated? To be honest the praise heaped on the 18-55mm lens on this forum is a bit over the top... yes it's good value, but it isn't amazing. The 16-45mm is very much sharper especially at the wide end and large apertures, and the CA is very simple to clean up without affecting image quality.

That's right... if we weren't willing to work around the occasional little foibles, we wouldn't be Pentaxians!

This is really cool Bob, excellent idea using continuous shooting rather than an intervalometer. Fortunately the K7 does 30 seconds without DFS, so if I had a go at this, I could do it in a third as many shots (and presumably use a smaller aperture). Did the exposure have to be correct on each shot for the program to work, or does it 'add' exposures together?

Very nice. I presume you had to use a tripod anyway, so why didn't you use a lower ISO to avoid having noise?

Well the hack doesn't work then! 'Heat' isn't the culprit as a DFS will not reduce heat any! It will reduce NOISE caused by the heat though. It just would have been nice to have the option to turn it off and do a manual dark frame at the end of a shoot.

Stefan's link relates to a hack which does (potentially) allow DFS to be completely disabled.

Sadly not within the K-mount system though.

It's an odd review. The K-x itself comes out very well, which is good news. But strange that they would review a product at the end of its life cycle when its replacement is already out (the K-r). The point about lens range is actually true but not that relevant for most users. The point about the K-5 is certainly not true, and again, odd, becuase the K-5 had only just been released when this was written and not extensively reviewed.

I have yet to hear a convincing argument for using Sv mode, although of course if it 'works for you' fair enough!

TaV is another thing entirely, very useful. I would use it for photos under floodlights in fact. Select an appropriate shutter speed for panning action shots, and an appropriate aperture and let the camera adjust the ISO. In Sv mode you sometimes might be using a needlessly high ISO.

There is only one thing that annoys me about TaV. At the moment if the camera can't select a low or high enough ISO for a correct exposure, you just get an over or under exposed image. You should be able to tell the camera to over-ride either the aperture or shutter speed setting to avoid this.

I wouldn't cry... the 35 2.4 is a very nice lens, less than a stop slower than the 31mm (not that I am saying it is on a par with that particular lens!)