Here are some items you might buy on Ebay auctions:

Joker with Binoculars & Moon, plastic playing cards NEW

US $2.42 (1 Bid) End Date: Sunday Jan-24-2010 2:13:24 PST Bid now | Add to watch list

Binoculars 4x30mm Night Vision Surveillance Scope

US $0.90 (0 Bid) End Date: Sunday Jan-24-2010 2:17:22 PST Bid now | Add to watch list

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Red 4 x 28 Binoculars HuntingCampingBird Watching    US $1.10

Red 6 x 30 Binoculars HuntingCampingBird Watching    US $1.49

BIRD WATCHER Parking Sign watching rare binoculars gift    US $7.95

New Bird Watcher Cardinal Watching Binoculars Ornament    US $5.99

BINOCULARS 10x25 POWER GREAT FOR HUNTING BIRD WATCHING    US $11.99

10 X 25 BINOCULARS SPORTS HUNTING BIRD WATCHING    US $8.88

Here are some items you might buy on Ebay auctions:

New 4x30mm Night Vision Surveillance Scope Binoculars

US $0.89 (0 Bid) End Date: Tuesday Jan-05-2010 1:13:01 PST Bid now | Add to watch list

Mystery Super Power 60X35 Coated Binocular Night Vision

US $7.19 (0 Bid) End Date: Tuesday Jan-05-2010 1:15:42 PST Bid now | Add to watch list

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Red 4 x 28 Binoculars HuntingCampingBird Watching    US $1.10

Red 6 x 30 Binoculars HuntingCampingBird Watching    US $1.49

Magnacraft Compact 10x25 Camo Bird Watching Binoculars    US $4.99

I bought a pair of 1st generation Seben binoculars and am curious as to what causes the whine when they are active. I understand the principle behind how they work, but what causes the whine?

 

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SPORTING BINOCULARS 10 X 50 CAMPING Bird Watching    US $8.35

BINOCULARS HUNTING BIRD WATCHINGVERY POWERFUL    US $14.99

Zeiss Conquest Binoculars 525008 8x50 T Bird Watching    US $1,272.99

Binoculars 10X25 Bird Watching Wildlife Brand New    US $7.95

BIRD WATCHER Parking Sign watching rare binoculars gift    US $7.95

Binoculars 7x35 Magnification for Nature Bird Watching    US $14.95