That looks rather good. We have similar things at work, and I'd love one for home use. I used to be able to focus to within a couple of inches of the end of my nose, but now that I'm in my early '40s, the inevitable presbyopia is setting in. My distance is still good, and I'm fine with computer monitors unaided, but I'm using +1 reading glasses for bench work (or reading in dim lighting). A recent trip to the optician (my first time
) confirmed that, and suggested that I move to +1.5 readers, which gets my minimum focal length to about 6-8 inches in bright light - fine for most things. For SMT stuff, I use those cheap loupes (x4 or x7), which is fine for brief jobs, but gets uncomfortable after a short while. Plus, the focal length is so short that you can't help but breath in fumes, etc... So a stereo microscope of modest magnification and a decent working range is just what I would like.
For "cheap but good" USB microscopes, this is worth a look: http://www.ebay.co.uk/itm/131560443344
(or http://www.banggood.com/Andonstar-500X- ... 41488.html
if you prefer). I haven't used it extensively yet, having only just received it, but first impressions are very good indeed. Dave Jones reviewed it enthusiastically a while back (https://www.youtube.com/watch?v=H2P1_JZYnVc
) when it was about $60. The eBay one has the "make offer" button enabled, and I can confirm they will take £35, and wouldn't be surprised if they'd go a little lower. It was shipped from the UK and arrived in just a couple of days.
As well as magnification, I can't stress enough the importance of lighting (and how hopeless incandescent lights are in this context). You can get away with a lot when you're young, but everything changes when you hit 40! But that's been done elsewhere
It's surprising how quickly the brain adapts to soldering under a microscope or camera!