One hot pixel can be fixed more easily in PP. It's likely that you'll find that the sensor warranty doesn't cover fewer than 'x' hot pixels for that reason.

That A looks like an M to me. Still a bargain though.

Actually, there is another method.

If your dioptre is set correctly and the image in the viewfinder is bright enough and your trust your eyesight, use your own eyes to determine if the part of the image that you want to be in focus is, or not.

A magnifying eyecup is available to make this task easier.

With MF lenses, the only accurate indication you have that an object is in focus is the green hexagon in the viewfinder. Neither the beep or the presence of the red focus indicator in the viewfinder should be relied upon to indicate correct focus, because they don't.
The beep simply means that a part of the image at one of the sensor points has been found to be in focus, and that sensor point will be illuminated by a red square. That doesn't mean that it still is in focus.

If the green hexagon is illuminated in the viewfinder, it shows that the part of the image at the chosen focus point is in focus.

The K20D behaves exactly the same. Can't speak for the K-7. As far as I know, all Pentax DSLR's behave this way, unless the K-7 is different, which I doubt.

Pre-A series lenses and A series lenses (and newer) set to other than A will always make an exposure at maximum aperture (wide open) when the exposure mode on the body is set to Av.

In order to get a reasonably accurate exposure with these lenses you must use manual (M) exposure mode and use the green button to stop the lens down and take a meter reading (stopped down metering).

I say reasonably accurate exposure because there are well documented issues using these lenses which I'll not repeat here.

Try here.

Good choice. Enjoy it.

I got 4 screw on adapter rings with mine. 49mm, 52mm, 58mm, & 67mm.

You also get a bayonet adapter to fit the D-FA Macro lenses. It fits in place of the hood.

Hope that helps.

I would suggest looking at the spec. sheets for each, then go and have a look at them for build quality etc.

I have the Pentax AF160FC ring flash and I can only say it produces excellent lighting. I've no knowledge of the other brands.

My only gripe with the Pentax flash is that they did not include any wireless capability so It can't be used to trigger other P-TTL flashes wirelessly and still retain full P-TTL functionality. I think this would be useful for studio work.