31 January 2008 16:00 GMT / By Katie Scott
The Sigma 70-300mm f/4-5.6 APO DG Macro and 70-300mm f/4-5.6 DG Macro both incorporate a built-in motor, which allows autofocus with all Nikon cameras.Sigma explains: "The Nikon D40, D40x and D60 cameras cannot fully support the original Nikon lenses, as there is no AF motor built into these cameras, therefore they require a motor built into the lens to achieve autofocus.
"Many people are unaware of this until they have purchased their new Nikon DSLRs. The inclusion of the built-in motor in these two new lenses allows autofocus with all Nikon cameras."
As well as this key feature, these lens also incorporate a macro feature with maximum magnification 1:2 at the 300mm focal length.
The APO lens has been designed to provide extra provision against colour aberration but both lenses use a new multi layer lens coating, which reduces flare and ghosting.
A magnification scale showing focusing distances and reproduction ratios is engraved on the lens barrel of both of the new models.
The 70-300mm f/4-5.6 APO DG Macro is priced £199.99 while the 70-300mm f/4-5.6 DG Macro is cheaper at £149.99.
Key features at a glance:
- Minimum aperture: f/22
- Minimum focusing distance: 150cm
- Lens construction: 14 elements in 10 groups
- Maximum magnification: 1:4.2
- Angle of view: 22.9°- 5.4°
- Weight: 545g
- Dimensions: 76.5mm(D)x119.5mm(L)
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