Sunagor 30-160x70 BCF Mega Zoom Binoculars with Case

Please see photos, these have hardly been used, but unfortunately they have marks inside lenses and I don’t know how to remove. You don’t see this when looking through.

I don’t have a manual or how they are put into focus. So needs someone that knows what they are doing or how to use.

Info

The world’s most powerful binoculars

High quality multi coated optics with BAK-4 prisms complimented by rubber armoured body

Sliding zoom lever for instant zooming and centre focus knob for quick sharp focusing

Built-in dioptric eyepiece correction to suit individual eyesight

Magnification: 30x - 160x

Lens type: Eco Glass