Doing so would negate any colour temperature differences between the street lighting and render them looking all the same, similar to AWB. I don't think that is the objective of this particular exercise.

Taking a grey card reading in daylight and using that same WB for all of the street lighting exposures would be appropriate though.

AWB is a definite no-no in this situation if you want to compare the effects of the different colour temperatures of the various lights. AWB will try and make them all look the same.

Use daylight or cloudy WB setting.

Chris, you have a PM.

The Pentax-A 70-200mm lens is one of Pentax's budget offerings and as such, it lacks the SMC coating.

I don't know any of the books you mention, but I would always choose Martin Evening's books before Scott Kelby's. I just don't like his writing style.

Also, there are plenty of Lightroom users here, just ask.

I've just downloaded the latest update to Lightroom 4 which is version 4.2

When I copied it to my software storage folder I noticed that I still had a copy of the Lightroom 3.6 update.

Lightroom 3.6 was 242,946Kb, Lightroom 4.2 is 769,437Kb, more than 3 times the size of V3.6

Now I know they've added a few modules like maps, and books (which I don't think many people use), but really, why so huge a jump in size?

EDIT: I may have answered the question myself. I'm assuming that the latest download has both 32 bit and 64 bit versions of Lightroom 4 which might account for its size.

I use FreeFileSynch. It works for me.

They are probably pollen grains, which are sticky.
An Arctic Butterfly might remove them, but the pollen may also stick to the brush. Best to use a wet solution, PecPads and Eclipse fluid should shift them but it can take a bit of practice getting the sensor smear free.

Surely, in TAv mode, ISO is the only variable and is allowed to float. It's only fixed at exposure time. Aperture and shutter speeds are fixed by the two dials.

If you want full control over all three (T, A, & ISO), you'll need to use manual

RIP Tony.