Four different Sigma macro lenses? Are the designers crazy?

Article Abstract:

Sigma offers four different macro lenses with both autofocus and manual mounts. They are the 50mm f/2.8, 90mm f/2.8, 180mm f/5.6 and 180mm f/2.8. The choice of focal lengths is an option to working with the inferior quality of most macro zoom lenses. The advantages and disadvantages of these lenses are examined.

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Tamron breaks the 28-200mm close-focusing barrier

Article Abstract:

The new Tamron 28-200m f/3.8-5.6 LD (IF) AF zoom lens reduces the minimum close-focus distances possible on previous models. The standard 8-ft focusing limit at 28mm is down to 37.375 in, 200mm close focusing is reduced to 31.5 in, and 135mm provides 20.5-in close-ups.

Evaluation, Product/Service Evaluation, Zoom lenses, Tamron 28-200m f/3.8-5.6 LD (Lens)

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Can't focus close? Try high-quality close-up lenses

Article Abstract:

Close-up supplementary lenses attach like filters to zoom lenses and make it possible to focus at close range in the tele-zoom position. Two of the best double-element lenses are the 5T and 6T made by Nikon but they come only in the 52mm and 62mm thread sizes.

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