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Pictures were taken using Zeiss Plan Apochromat 20x or 40x objectives.

Key Role of STAT4 Deficiency in the Hematopoietic Compartment in Insulin Resistance and Adipose Tissue Inflammation

Part of TMB's Signature Series, this 92-mm apochromat is a fast f/5.5 triplet-lens design, making for a stubby, ultra-compact tube assembly.

Short and sweet: does TMB's new 92-mm refractor live up to the claim that it's a replacement for the legendary Astro-Physics Stowaway?

While not unique, its striking carbon-fiber tube certainly helps set this 80-mm f/7 apochromat apart.

Astro-Tech AT80EDT refractor

$395 mount) $1,220 Mount Tele Vue Tele-Pod included Optics type apochromat achromat Aperture 60 mm 100 mm Focal length f/ratio 360 mm f/6 640 mm f/6.4 Finder none built-in Mount type altazimuth equatorial (fork) Motor drive no no Computerized "Go To" no no Shown with optional star diagonal and eyepiece.

101 scopes priced from $1,000 to $5,000

STELLAR APO Stellarvue adds a new affordable 4-inch apochromat to its line of premium-quality refractors.

Stellar APO

One way to reduce the problem of chromatic aberration to negligible levels--and to keep the tube length manageable in larger scopes--is to introduce a third glass element to the objective, producing a triplet, or apochromat. Alternatively, exotic substances such as fluorite may be substituted for one or more of the lens elements, resulting in an apochromatic doublet.

Be scope savvy: looking for that first telescope, or thinking of moving up to a better one? Here's what you need to know as you ponder the vast selection available to you

It's the only 90-millimeter apochromat made with a three-element objective, which offers a level of color correction not possible with two-element designs.

Hot new products for 2007: it's time for us to make our annual selection of the most intriguing new products entering the market