Sigma Tele Converters
- Brand: Sigma
- Subject: SLR Lenses
- Category: Converters
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Photokina report
Sigma announces the new APO Tele Converter 1.4x EX DG and APO Tele Converter 2x EX DG for Sony mount. The new tele converters are capable of maintaining the HSM function of such telephoto lenses as Sigma’s APO 70-200mm F2.8 II EX DG MACRO HSM and APO 50-150mm F2.8 II EX DC HSM whilst increasing the focal length by a factor of 1.4x or 2x. Of course, the HSM AF compatibility depends on the capability of the Sony SLR camera to support this function and on the maximum F number of the attached lens. The Super Multi Layer Coating reduces flare and ghosting and the exclusive design maintains the master lens’ high level performance while extending its focal length. Compact and lightweight, these tele converters are a convenient way of increasing the focal length of HSM telephoto lenses.
Nikon Telephoto Converter TC-E3PF
- Brand: Nikon
- Subject: SLR Lenses
- Category: Converters
Nikon Corporation is pleased to announce the introduction of the TC-E3PF - an advanced new 3x telephoto converter born of unique Nikon technology for use with the new 8-megapixel Coolpix 8400. Smaller and lighter, the TC-E3PF illustrates how Nikon is taking existing lenses and redesigning them for "on-the-go" convenience. Furthermore, the widely acclaimed TC-E3ED is also compatible with the Coolpix 8400. In conventional telephoto converters, a lens with a pronounced convex shape is used to refract the light received through the first element to a greater degree. This results in the desired reproduction ratio, however chromatic aberration can occur. In the event that a convex ED lens is used, such chromatic aberration is corrected, however the refractive limitations of such a lens make it difficult to reduce overall dimensions.
