Is anyone here well versed on optics? What does 8x25 stamped on a pair of binoculars mean?
I had to replace my opera glasses, but the ‘made for the job’ ones on sale were really cheap and plasticky, so I invested in a small pair of binoculars. They are great quality in construction and image, but they are very, what I call ‘jumpy’ - where it is hard to keep a moving image in the frame if this makes sense.
The binoculars have ‘8x25’, then ‘429FT@1000YDS’ then ‘Bak4 PRISM’ stamped of the focusing ring. I presume this denotes the magnification of the glasses and quality of prism - but what exactly? What do I need to look for to give me a wider window of view so that I get more into view?
Opera glasses are normally 3-4 magnification - the more magnification the more sensitive to “movement” they are. So 8* magnification is going to be jumpy in comparison
The second number (in mm) is the diameter of the lens elements - a higher number means it will collect more light so give a brighter image, but the binos will in turn be bigger and heavier.
Just as has been noted that a high magnification is not an advantage for a situation where you may want to hold them for long periods, so a large aperture is also not likely to be useful for watching theatre or opera performances which tend to be well lit - but for looking at the night sky large lenses are a plus!
I have no personal experience of this specific pair but I think they are probably the kind of thing you should be looking for:
A big thanks for this ChrisMann! I was just scouring the internet and annoyingly note that the 3 and 4X glasses by well known mfrs, Pentax and Nikon are well into the 250€ mark - there is splashing out, and splashing out… But these that you found fit the bill quite nicely. So, thanks again!
As with other lenses, binoculars often have the ability to be focused for objects at different distances. This is especially necessary with glasses that give a large magnification and a large diameter lens element. These have been designed to work at expected audience to stage viewing distances, and will not require focusing because that has been fixed at what the consider the right position. The advantages with these is that you will be able to just sit down & use them and they’ll probably be fine, plus they will be lighter and are cheaper to make. A disadvantage will be if you sit very close to the stage of a very long way away, because the performers may not be is absolutely sharp focus, but that’s unlikely to be a problem in general use.
But these that you found fit the bill quite nicely. So, thanks again!