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The specifications (Based on Sigma Mount)

APO TELE CONVERTER 1.4x EX DG

Lens Construction: 3 Groups - 5 Elements
Focal Length: 1.4 times of master lens
Aperture Range: F2.8-32
Magnification: 1.4 times of master lens
Dimensions: φ 68.5mm×19.5mm
Weight: 160g

APO TELE CONVERTER 2x EX DG

Lens Construction: 5 Groups - 6 Elements
Focal Length: 2 times of master lens
Aperture Range: F2.8-32
Magnification: 2 times of master lens
Dimensions: φ 68.5mm×52mm
Weight: 235g