I have owned all the above binoculars at some time and feel it is time to extol their virtues. They are all made to military standards and marine tested i.e. they are waterproof and nitrogen gas filled. Focussing is by rotating rings on the eyepieces. They may have code names like FMT-SX, FMTR-SX (rubber armoured), Polaris, Poseidon and Meibo.
Optically they are simply brilliant - the 7x and 10X can be handheld but to avoid handshake it is best to use the 14X and 16X on a tripod. All the binoculars come with a thread on the front to take a tripod adaptor which fits a standard tripod. The best of them is I feel the 10X70 - the magnification is low enough to hand hold the binoculars and you get a wide field of view with minimal distortion. The large 70mm objectives give a nice bright image even when it's getting dark. The eyepieces are large with long eye relief so you can sit back and get stunning views. They are great for terrestrial as well as astronomical use. You can tell the lenses are of good quality because there is very little distortion even to the edge of the field of view. The 14X and 16X give greater magnification but at the expense of reduced brightness, reduced field of view and shorter eye relief (you have to get closer to get a full field). Also handshake becomes a problem and you really need a tripod to get the best benefit.
The 7X50 is also available as an M22 version which has built in green laser filters - they give a pinkish tinge but the optics are as sharp as ever. All these binoculars sell for over £500 new but there are bargains to be had on eBay - I have seen the M22 sell for £100 and the bigger 10X70 go for £300. They are a match for Leica and Swarovski binoculars which usually sell for over £500. If you are interested in quality optics and the name isn't so important to you, remember Fujinon.
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