Zhumell’s 25×100 binoculars capture lots of light

These impressive binoculars provide brilliant, high-power views of celestial objects.
By | Published: February 24, 2011 | Last updated on May 18, 2023
Zhumell’s Tachyon 25×100 binoculars offer high power and a 3° true field of view. The unit’s exit pupils measure 4 millimeters in diameter.
Astronomy: William Zuback
Over the past year or so, I’ve seen a lot of buzz in online astronomy forums about the 25×100 Tachyon binoculars by Zhumell. These monsters boast a pair of 3.9-inch (100 millimeters) objective lenses, fully multicoated optics, and BaK-4 prisms — all for an average street price of $230. Having paid more than twice that for my premium 16×70 binoculars, I wondered how good they could be.

I found out when my wife, Wendy, gave them to me for my birthday. After unwrapping the ribboned present, I was initially struck by Zhumell’s care in packaging. A foam-lined hard case cradles the binoculars and holds them snugly during transport. I later learned that Zhumell’s careful packaging keeps the binoculars in perfect collimation.

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