![]() ![]() ![]() Image Quality I used Imatest to check the sharpness of the lens when paired with the 50-megapixel 645Z. ![]() It's not surprising that the 90mm is a 1:2 lens-its field of view on the 645Z matches a 70mm lens on a full-frame camera, and, with some exceptions, 1:1 macro lenses typically have tighter fields of view. The FA 120mm F4 Macro focuses closer and a has a longer focal length, making it the only 1:1 magnification option in the Pentax medium format system. When working that close the lens projects objects onto the sensor at one-half (1:2 magnification). The minimum focus distance is 1.4 feet (41cm). The switch limits focus from about 2 feet (0.6-meter) to infinity, or from the minimum focus distance to 2 feet, depending on where the focus point is set when it's enabled. There is a focus limiter switch, a useful tool to prevent the lens from hunting for focus across its entire range. If there's anything to complain about, it's that the motor that drives lens elements during focus is on the slow side. The focus control occupies a good portion of the lens, and supports the Pentax Quick Shift focus system, which allows you to manually override autofocus after it's been locked, without the need to change the focus mode. The outer barrel is composite, but the inner barrel that extends as you focus closer and the manual focus ring are metal. An AF/MF switch changes the focus mode, and there's a toggle to turn the stabilization system on or off. There are a few toggle switches on the lens barrel. Like the 645D and 645Z, it is fully sealed against the weather, so capturing objects such as insects in their natural habitat is possible-even in inclement conditions. It supports 67mm lens filters and ships with a petal lens hood that can be reversed when not in use. Best Hosted Endpoint Protection and Security SoftwareÄesignThe 645 Macro 90mm is bigger than most 35mm SLR lenses, but isn't out of line for medium format, measuring 2.5 by 1.5 inches (HD) and 2.3 pounds. ![]()
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