Archive for June, 2015

PostHeaderIcon A New Kind of Package Lens

One of the truisms of our profession has long been a camera system is only as good as its optics. While computational non-optical lenses in devices like the iPhone have obviated the need in some applications for finely crafted optics, the demand persists for high-performance glass at the high end of our business, especially in light of the latest 4K and higher resolution cameras.

The new Sony PXW-FS7 4K camcorder is well-balanced and robust, with superb ergonomics. Particularly notable, however, is Sony’s own 28-135mm F4 lens that comes with it.  It is not the typical crappy package lens that usually accompanies new mid-range cameras.

Employing precisely sculpted aspheric elements and low-dispersion glass the FS7 4K zoom represents a real breakthrough in economical s35mm lens technology. Remarkably free of chromatic aberrations – the main reason cheap lenses look cheap – the lens compares favorably with much pricier optics; its relatively slow F4 maximum aperture posing less of a challenge these days for shooters employing cameras like the FS7 that shoot virtually noise-free at ISO 2000 and higher.

Sony’s lens uses precise servo control of zoom and focus to enable a constant F-stop throughout the zoom range. Some shooters will object to the limited 5:1 zoom for documentary work but keep in mind the lens is a large format zoom.  If you’re looking for a 23x capability you should consider a 2/3-inch camera like the Varicam HS, which is ideal for travel and sports, and certain wildlife titles, that tend to employ long zoom telephoto lenses.

Sony's new 28-135mm E-mount zoom offers very high performance in an economical S35mm format lens.

Sony’s new 28-135mm E-mount zoom offers very high performance in an economical S35mm format lens.

Sony's new 28-135mm F4 zoom is remarkably free of chromatic aberrations.

The zoom even at maximum magnification  is remarkably free of chromatic aberrations.