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hen selecting lenses for your Sony camera, keep teleconverters in mind. 2X teleconverters are more popular and powerful. 1.4X teleconverters are more useful and often have less distortion too. 3X teleconverters are rarely used
anymore, as they have so much image degrading effect as to be worse than simply enlarging a smaller image. Teleconverters work much better on
telephoto lenses (200mm and up) than on shorter focal length lenses and typically work better on
prime lenses than on
zoom lenses.
With a 1.4X teleconverter, you lose a stop of light. So an 135 f/2.8 lens becomes the
equivalent of a 190mm f/4. A 200mm f/4 becomes a 280mm f/5.6 equivalent. With a 2X teleconverter, your 135mm f/2.8 becomes 270mm f/5.6 and your 200mm f/4 is a rather slow 400mm f/8 equivalent. You can also convert your 50mm f/1.8 into a 100mm f/3.5 using a 2X.
teleconverter |
| Teleconverters for Konica, Minolta, Sony DSLR Cameras |
  Kenko Teleplus
Teleconverter Pro DG 300 1.4x for Konica Minolta Maxxum Dynax. KENKO Teleplus Pro 300 converters are made with high quality
multicoated optical glass supplied by Hoya corporation, the worlds largest manufacturer of optical glass. This glass will match the optical quality of the
prime lens (even at the edges, unlike many teleconverters on the market today). The optical design of the elements and light path is wide enough not to cause any
vignetting.
Designed specifically to be use with telephoto lenses of 100mm or above, and work best with telephoto lenses of 200mm to 500mm. The PRO 300's can be used with telephoto
zoom lenses as well as prime lenses, but, due to their design, Kenko does not recommend them for lenses that have a zoom range that starts under 50 mm.
Kenko PRO 300 converters are intended to be used with expensive telephoto lenses and
larger camera bodies.
They have all metal lens mounts in both front and rear, as well as a metal core,
to support today's heavy professional camera bodies.
Construction: 2 Groups/ 5 Elements
Dimensions: (Length x Diameter) 19.4 x 67mm (.75 x 2.6")
Weight: 132g (4.7oz)
Notes MultiCoated, Depth of Field: 1/1.4 of prime lens/Exposure Magnification: Approx. 1 stops.
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  Sigma APO Teleconverter
1.4x EX DG for Minolta and Sony Mount Lenses. The Sigma APO Teleconverter 1.4x EX DG for Minolta Digital SLR Cameras is a dedicated APO teleconverter that can be mounted between select lenses and the camera body to increase the
focal length by the power of 1.4. The
multi-layer coating reduces
flare and ghosting, which is a common problem with
digital cameras. The lens also offers maximum magnification without any variation in the minimum focusing distance. Compact and lightweight, this teleconverter can convert your
lenses into longer
focal-length lenses, so you don't have to do a lot of unnecessary footwork. A case for the lens is included.
Specifications:
Lens construction: 5 elements in 3 groups Focal length: 1.4x that of a master
lens Aperture coupling range: F2.8 - F32 Reproduction ratio: 1.4x that of a
master lens Dimensions: 68.5 × 19.5mm (2.7in. × 0.75in.) Weight: 143g (5oz.
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  Tamron Autofocus 2x
Teleconverter Lens for Konica Minolta SLR Cameras. Teleconverters, either 1.4X or 2X, are efficient tools to add focal length to the
photographer's arsenal. The 2X doubles the focal length of the master lens and makes the lens two
f-stops slower. In addition to increasing focal length, this teleconverter allows greater magnification in
macro since the Minimum Object Distance (MOD) of the master lens does not change when used with the teleconverters.
AF will be retained with the 2X teleconverter
if the master lens is F/4.0 or faster.
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See also
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