Technical Follow-ups

Follow-up Blog questions for October –

BF1.  Segregating posts for each project rather than having all posts come through on my home page

Follow-up Technical questions for October –

TF1. How to best capture light as it falls through objects and show the beams of light, correctly metering and setting expose & approach for this?
e.g.
http://www.alexsaberi.com/wp-content/uploads/2013/03/manandhisdogs-041bw2.jpg
and
http://www.alexsaberi.com/wp-content/uploads/2013/03/richspetmiststart-236.jpg
and
http://www.alexsaberi.com/wp-content/uploads/2013/03/stagmists-339as.jpg
to some degree –
http://www.alexsaberi.com/wp-content/uploads/2013/03/maymist-0941.jpg

TF2.  I need some extensive advise on setting up portrait chiaroscuro for my last set of test images.  Can you help?
e.g.
http://www.thephotoargus.com/35-gorgeous-examples-chiaroscuro-photography/

TF3.  What practical tips can you suggest for Astro-photography and HDR (Bracketing exposure)?