Looking at the binocular Russian version that comes in an oblong plastic white case.
The length of each monocular half is 33mm. the objective is probably 17.5mm and the magnification about 2.5x.
But it focuses at the front by rotation of each half of the binocular. So the magnification might change.
The field for me is 11 degrees.
It is quite sophisticated.
There are three multicoated surfaces and 4 white reflective surfaces, so probably a cemented doublet and two singlets. Maybe four elements.
It actually isn't bad optically, and it hinges in the centre to fold in half.
But the binocular in its case isn't that small.
I think that for under £10 the monocular is worth getting, but might suit some people more than others.
There are 3x, 3.5x, 4x, 4.5x and 5x monoculars from maybe, Opticron, Vixen, Nikon, Zeiss, Beechers Mirage and Eschenbach. Maybe others also.
The most useful for me is the 8x21 folding monocular that cost about £15. Made under various names. Maybe originally Japanese but now Chinese? Originally Zeiss.
There is also the folding Russian 5x25 and 7x25 which are a bit bigger.
Then there is the Leica Monovid?
For me, just holding my distance glasses 8 or 10 inches in front of my face gives me a 2x magnification with greatly increased stereo. In fact rather spectacular, so the 2,5x Russian Galilean binocular is normally superfluous..
I also have the Zeiss 5x10 shirt pocket monocular, but the eye relief is so great I cannot use it unless I wear distance glasses and gently rest the device against the glass surface. It may use relay lenses.
The Nikon doublet is in the other room. I'll check maybe 52mm?
I can't remember which camera lens it came from but cost me nothing.
It is high quality.
Regards,
B.
