You can't move at the moment for High Definition cosmetics. I'm not - entirely - convinced that for day-to-day wear you need cosmetics that provide coverage designed for such a specific purpose (essentially a High Definition cosmetic is one designed not to look dreadful for digital photography), but some of them do have their uses.
I'm a fan of HD powders, they're a lot finer than traditional talc-based powder, and for that reason, on my slightly dry skin, I find them quite easy to wear. They're also slightly lighter than talc-based cosmetics, so they won't clog your pores, and they're also suitable for summer-wear over a tinted moisturiser.
I own two HD powders, firstly Elf HD Powder:
Mainly consisting of silica, this powder costs £6 and is available from the ELF website. It's housed in a bulky black box with a sifter, and comes complete with a velvet puff to buff the product into your skin.
I also own the Urban Decay Razor Sharp Ultra Definition Finishing Powder (catchy name! But it's essentially an HD powder like the ELF above):
This is housed in a round container, which has a built-in applicator, which makes it slightly less likely that you'll end up spilling the powder all over your feet when you're using it. Not, of course, that I'm speaking from experience! Their are two major differences between the Urban Decay HD powder (seriously, I cannot be bothered typing the full name out every time) and the ELF, and that is the UD is beige, and it costs £17.
So, given that the major component in both powders is silica, is there much difference between them? Actually, yes. And no. Both feel silky on the skin thanks to the silica, and both work well as finishing powders, giving the skin a matte-ish, but not flat finish. In fact, the ELF powder is the one I use as a finishing powder in the vast majority of my makeovers, but I do find that the Urban Decay does, in fact give a finer, softer finish on the skin, and feels a great deal silkier when rubbed between your fingertips. There's not a huge amount to choose between them to be honest. Both involve patting the applicator over your skin, then I like to sweep away the excess with a large powder brush, to give an even finish.
All that said, which one would I buy again? The ELF. Most likely. For my purposes, it's just that little bit more versatile. Yes, it doesn't have the "sexy" packaging of the UD, but I don't think the fancy container justifies a three times higher cost considering the similarity of the contents. I did find, in use that the UD reminded me a great deal of Prescriptives (now discontinued) "Magic Powder", and I think it has some of the same "water-burst" technology, so people who've been yearning for a duplicate, here's your chance! For me though, I'd still buy the ELF, I can always put it into a fancy container ...
Do you own any HD cosmetics, what do you think of them?
The Fine Print: I bought these. A little while ago, admittedly, but I've still got the box the ELF came in. I really need to tidy up.