Sigma SD10 SLR Review
Lenses, Image Sensor, Viewfinder, Flash
The SD10 employs a SA bayonet lens mount for Sigma SA series lenses. Because the image sensor is smaller than a 35mm film frame you must use a factor of 1.7x to determine the equivalent angle of view for the lens being used. A normal 50mm lens is the same as an 85mm lens.
The SD10 offers Single AF and Continuous AF with Predict Function (it "predicts" where the subject will move to next based on movement). The auto focus speed varies depending on the lens being used, Sigma claims the SD10's AF is "enhanced" over what was used in the SD9.
(Above and to the right of the lens is the infrared remote receiver port for the optional
RS-21 remote control, it's not an AF-assist lamp.)
This is the SD10's "dust protector" it prevents dust and other
contaminants from getting on the image sensor. When dust gets on the dust protector it
won't influence the image quality because it's located away from the image sensor.
New Sigma DC (Digital Camera) Lenses
Sigma 18-50mm F3.5-5.6 DC
Sigma Corporation announces the new 18-50mm F3.5-5.6 DC. This zoom lens was exclusively designed to suit the characteristics of digital SLR cameras. The image circle was designed to match the size of the image sensors of digital SLR cameras, and this produced a compact lens with a maximum diameter of 60mm (2.3"), overall length of 67.5mm (2.6") and weight of only 245g (8.6 ounces). It has a variable angle of view of 76.5°~31.7°.
On the SD9 or SD10 the angle of view is equal to 30-85mm focal length. The use of aspherical lenses provides correction for various aberrations throughout the entire zoom range and produce high level of optical performance. 18-50mm F3.5-5.6 DC lens has a minimum focusing distance of 25cm (9.8") at all focal lengths and is capable of macro photography with a maximum magnification ratio of 1:3.5.
Sigma 55-200mm F4-5.6 DC
This compact telephoto zoom lens was exclusively designed for use with digital SLR cameras. The image circle was designed to match the size of the image sensors of digital SLR cameras that also allows compact body and lightweight with overall length of 84.6mm (3.3"), and weight of only 310g/10.9 ounces.
On the SD9 or SD10 the angle is equal to 93-340mm focal length.
It has a filter size of 55mm, maximum diameter of 70mm
(2.7"). This remarkably compact high performance zoom lens is ideally suited to a wide range
of subjects. This lens has a minimum focusing distance of 110cm (43.3") and maximum
magnification of 1:4.
The Foveon X3 sensor
features the powerful VPS™ (Variable Pixel Size) technology. VPS provides the
on-chip capability of grouping neighboring pixels together to form larger pixels that are
optimal for reduced resolution, high frame rate or dual mode still/video applications.
Other advanced features include: low fixed pattern noise and ultra-low power consumption.
The eye level pentaprism finder shows 98% of the captured frame. It has dioptric
adjustment (-3 to +1dpt) and a comfortable eye relief with a fairly wide viewing angle.
The viewfinder display - in the center are AF focus zones and the center-area
metering circle. Across the bottom is the digital readout area that indicates flash ready,
autofocus status, shutter speed, AE Lock, aperture value and Auto Bracketing value
(doubles as exposure meter in Manual mode.)
Because the image sensor is smaller than 35mm film, the image capture area is also
smaller (indicated by the "1" above.) Sigma calls this a "sports finder" and
masks out the area not captured by the image sensor. It gives you the advantage of
seeing your subject before it enters the active capture area.
The SD10 does not have a built-in flash. The flash hot shoe allows the connection of the Sigma EF-500 DG Super SA or the EF-500 DG ST SA external flash units. Flash X-sync shutter speed is 1/180 sec or slower. The optional ST-11 PC Synchro Terminal Adapter allows you to connect other types of flash units or studio lighting.
The Sigma speedlights also give the SD10 the ability to focus in the dark with their AF
Auxilliary Lamps. And S-TTL Wireless Flash, if two optional electronic EF-500 DG SUPER
flashguns are used. In the "Wireless Flash" mode, the camera will control the flash power
For bounce flash it can be tilted 90° upwards and 7° downward for close-ups. Also, it can be swiveled 180° to the left and 90° to the right. In addition manual flash can be set to full and 1/16 output levels in 2 steps. Covering focal length of the flashlight can be seen on the LED panel and the flash ready signal can be seen in the viewfinder. EF-500 DG ST incorporates auto power off system.
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