Sony fe 90mm f 2.8 macro7/22/2023 ![]() The DDSSM drive system is remarkably quiet, making it ideal for animal and insect photography, as well as for movies. In this case two floating focus groups are driven by independent DDSSM systems for precision positioning of the relatively heavy lenses required for macro photography. Quiet, precise DDSSM (Direct Drive SSM) focus drive - employs piezoelectric elements oscillating at ultrasonic frequencies to drive the focus lens groups. The use of precision, quiet linear motors and technology inherited from high-end Sony professional camcorders results in exceptionally quiet, effective image stabilization that contributes to high-quality movies as well as stills.ĭirect Drive SSM (DDSSM) for quiet, precise focusing ![]() Gyro sensors built into the lens detect even the slightest movement, and the stabilization lens is precisely shifted to counteract any image blur that might occur. Minimal focus breathing and quiet operation are also advantageous for shooting movies. The focus ring slides back and forth to select manual or auto focus which together with a focus hold button, inner focus, and a focus range limiter provide optimum control for macro photography making it easier to shoot insects and other subjects that cannot be approached too closely. In the SEL90M28G, the limit is set on far ranges only. In macro lenses, this limit can be on either the near or far range (as pictured). This function allows you to set a limit on the focusing range which can save you time during AF operation as the lens will not 'hunt' through the entire focusing range. ![]() The preview function can also be assigned to this button through the camera's custom settings. Once you've adjusted focus to where you want it, pressing this button on the lens barrel will keep the lens locked to that focusing distance. Also, the filter thread at the front of the lens does not rotate, which is convenient if you're using a polarizing filter. Other important benefits include fast autofocusing and a short minimum focusing distance. Only the middle groups of the optical system move to achieve focus, so the overall length of the lens does not change. Well-designed aspherical elements can reduce the total number of elements required in the lens, thus reducing overall size and weight. Specially shaped "aspherical" elements near the diaphragm restore alignment of light rays at the image plane, maintaining high sharpness and contrast even at maximum aperture and can also be used at other points in the optical path to reduce distortion. This is caused by differences in refraction at different points on conventional spherical lenses which degrade image quality in large-aperture lenses. Spherical aberration is a slight misalignment of the light rays projected on the image plane. Smoother, more natural defocusing can be obtained as a result.Īspherical lens design dramatically reduces spherical aberration while also reducing lens size and weight. alpha lenses overcome this problem through a unique design that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed by 2 stops. Conventional aperture blades have flat sides creating unappealing polygonal shaped defocused points of light. This 'bokeh' effect of the blurred background can be enhanced with circular aperture blades used in this lens. When changing your aperture to defocus the background, the light sources appear blurred. The reflection suppression characteristic of the Nano AR Coating is superior to conventional anti-reflective coatings, providing a notable improvement in clarity, contrast, and overall image quality. This precisely defined regular nano-structure allows accurate light transmission, contributing to high-quality images, even more so than lenses with coatings that use an irregular nano-structure. Other advanced technologies, such as the Nano AR Coating and Super ED (extra-low dispersion) glass, elevate overall performance to an extremely high standard.Įffectively suppress reflections that can cause flare and ghosting with Sony's original Nano AR Coating technology. Sharp in-focus rendering is achieved with a floating focus mechanism that suppresses aberration equally at all focusing distances, whether the subject is far away or extremely close. Advanced optics and coatings with a 9-blade circular aperture deliver exceptionally smooth bokeh that G Lenses are renowned for. The full-frame 90mm medium telephoto macro E-mount lens features built in image stabilization for sharp, clear images at up to 1:1 magnification, even when shooting handheld.
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