apochromatic

The Foldable Tube f170/f260 combines brilliant apochromatic optics and a revolutionary design for maximum visualization flexibility, magnification potential and positioning ergonomics.

Vortex's (www.vortexoptics.com; 800-426-0048) Razor HD 20-60x85mm Spotting Scope (65.7 ounces) is constructed using a sophisticated triple apochromatic objective lens ground from high-definition, XD optical glass to almost completely eliminate chromatic aberration.

* Apochromatic Lens: Lens in which red, blue and green colors are brought to a common focus by three lens components (also, apochromat, ED or APO lens).

Minolta Corp., Ramsey, N.J., introduced the $1,299 advanced 5-megapixel Minolta DiMAGE 7Hi, an SLR digital camera with an equivalent 28-200mm (f/2.8-f/3.5) apochromatic Minolta GT zoom lens.

The S8 APO stereomicroscope offers a fully apochromatic corrected optics system.

Minox's 15x58 ED BR binocular features ED/fluoride glass with apochromatic color correction, a rugged nitrogen-charged macrolon body and large, soft eyecups.

The Vieew system consists of a solid temperature-resistant and shock-resistant cabinet, an integrated black and white CCD camera and high-end apochromatic lenses.

DETAILS: Astro-Tech AT90EDT apochromatic refractor with SBIG ST-8300M CCD camera.

It also features a triple apochromatic lens system that reduces fringing, dilution of color fidelity and degradation of resolution.

If you can afford to spend more, steer toward objectives that are "apochromatic" or "semi-apochromatic."

The latter, with an aperture of 150mm, will perform as well as many modern expensive short focus apochromatic triplet telescopes.

The Leica M320 F12 bundles apochromatic optical quality with LED illumination and high-definition imaging technology, providing ease of use and flexible, smooth maneuverability.