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The HD Pentax D FA 645 Macro 90mm F2.8 ED AR SR is an image-stabilized 71mm-equivalent macro lens for its 645D medium-format DSLR. The lens offers maximum magnification of 0.5x, when focused at its 41cm (1.36") minimum focusing distance. It features the company's HD and nano-scale Aero Bright coatings to maximise light transmission while reducing internal reflection. The design features 11 elements in 9 groups and the Quick-shift system for switching between autofocus and MF modes.
| Lens type | Prime lens |
| Image stab. | Yes |
| Lens mount | Pentax KAF2, Pentax 645AF2 |
| Max aperture | F2.8 |
| Min aperture | F22.0 |
| Min focus | 0.41 m (16.26″) |
| Max magnification | 0.5 x |
| Weight | 1040 g (2.29 lb) |
| Length | 117 mm (4.61″) |
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 | 24.1 megapixels 3.2″ screen APS-C sensor |
