Of the 30 6x18 probably Chinese waterproof roof prism IF binoculars.
10 were good.
10 were just about usable.
10 were failures. However, in this instance if they were cut in half, many would make useful monoculars, being IF.
There was basically no quality control.
Cost price £7.50 including nice yellow case.
They do seem to be waterproof, left in a bucket of water overnight.
Of the approx. 30 8x21 and 10x25 roof prism probably Chinese cheapies perhaps half were surprisingly good. £2 to £3 in charity shop. About £10 retail.
Glass optics, some of the later ones may be partly plastic.
What amazes me is how these binoculars can sell for less than a tenner, probably £2.50 from factory.
They were and maybe are made in vast quantities.
Chinese new cheap Waterproof roof prism 10x42 maybe. Had fungus in it when brand new.
Various crazy zoom small or very small binoculars, at least some probably Chinese. Maybe twenty tried.
Top magnification maybe 30x to 70x or more.
I reckon that only 2% of these mad binoculars work at maximum magnification when new.
Not very cheap.
To me these are a con, but that is what the buying public want. They also want 300x or more toy telescopes.
Firms get rich selling this snake oil junk.
My general impression is that Chinese binoculars range from the most awful binocular I have seen to very good.
They make and sell large numbers of fakes.
Many Chinese firms have no regard to copyright or honest advertising. This is of course not always the case.
But I think the only way one can get a rather good Chinese binocular is by having a Western importer deal with quality control., and keep a very tight ship.
This is not racist. I have dealt with China for 50 years. They used to be totally honest. Not now.
However, individual Chinese dealers are very honest.
It is the corporate companies that are giving this bad reputation.
In my experience much of this naughtiness started in the U.S.A. perhaps a hundred years ago with dishonest advertising, and this has spread worldwide.
One cannot grow a country's GDP by 8% per annum for many years without dodgy practices. Dumping, rigging exchange rates, no regard for the environment, poor worker conditions etc. etc.
It is us the buying public who have demanded Cheap above everything else.
However, Chinese astro scopes can be very good and very inexpensive. The mounts though are usually a bit dodgy.
I don't know how they can be made for the price.
In many cases a western made objective or mirror can cost more than the whole Chinese scope.
The main protection when buying Chinese optics is to test it and if satisfactory buy the tested one, not a similar new boxed one.
And hopefully, over time, modern Chinese products can regain the quality that they used to have in the past.