Pentax *ist DS2 SLR Review
Lens Mount, AF System and Lenses
Only DA and FA J lenses and D FA/FA/F/A lenses having an "A" position on the
aperture ring can be used with this camera.
Using the Aperture
The *ist DS2 accepts a large number of existing 35mm-format interchangeable zoom and
special-application lenses and accessories to help accommodate diversified
photographic requirements and maximize creativity and image quality.
See below for information about Pentax's DA series of digital lenses.
APS-Sized CCD Image Sensor
The "heart" of the *ist DS2 is an APS-sized CCD image sensor with an effective 6.1 million pixels. The effective sensor size is 23.5 x 15.7 mm with the same 3:2 aspect ratio of 35mm film. The *ist DS2's CCD (on the right) is compared in size to a "large" 5-megapixel 2/3-inch CCD imager.
Because the imager is physically smaller than 35mm film
the angle of view is 1.5x the normal lens focal length. This makes going ultra-wide a
challenge but it yields longer telephoto focal lengths with no reduction of maximum
aperture. The 75-300mm zoom becomes a 120-480mm lens!
11-Point TTL AF System
The *ist DS2 employs the SAFOX VIII TTL phase-matching autofocus system, the camera's 11-point AF sensor covers a wide area of both horizontal and vertical image fields with exceptional speed and precision even under poor lighting conditions. Nine of the 11 AF sensors are a horizontally extended, cross-shaped type, improving focusing accuracy and aligned to effectively cover the middle section, while two additional sensors are positioned at each side of this section. The selected AF sensor point is highlighted in red in the viewfinder for easy visual confirmation.
In addition to the
versatile "Auto" mode and the pinpoint "SPOT" mode, the *ist DS2 offers the innovative
"SELECT" mode, which allows the photographer to select one of the 11 AF sensor points
using the four-way controller on the back panel. The user-selected sensor point is
superimposed in the viewfinder with a red LED indicator. Focus modes available are
AF-Single, AF-Continuous and Manual. Focus lock available. The working range of the
AF system is from EV0 to EV19 at ISO 200.
PENTAX DA Series
|Lens mount:||PENTAX KAF mount|
|Lens construction:||12 elements in 9 groups|
|Angle of view:||76° - 29°|
|Number of diaphragm blades:||6|
|Minimum aperture:||F22 at 18mm; F38 at 55mm|
|Metering system:||TTL open-aperture metering|
|Minimum focusing distance:||0.25m (0.82 ft.)|
|Dimensions (diameter x length):||2.7" x 2.7" (68mm x 67.5mm)|
|Weight:||7.9 oz. (225 grams)|
PENTAX-DA Zoom 50mm-200mm F4-F5.6 ED
Designed for exclusive use with PENTAX KAF-mount digital SLR cameras, the new lens offers 4X zoom coverage in the telephoto range. Further, the lens features an angle of view from 31.5 degrees to 8.1 degrees (equivalent in focal length from 76.5mm to 306mm in the 35mm format). As with all DA-Series lenses, this DA 50mm-200mm features a responsive "Quick-Shift Focus System" that allows photographers to instantly switch the focus mode from auto to manual with a slight twist of the focus ring. Coupled with a simple, functional design and the elimination of an aperture ring, this new mechanism considerably improves operability.
The lens also incorporates an Extra-low
Dispersion (ED) glass lens element and two aspherical lens elements for true-to-life
image reproduction and overall size reduction. The image circle in DA-series lenses is
designed to perfectly match the 23.5mm x 15.7mm size of the CCD used in PENTAX digital
SLRs to optimize camera performance. The new design also contributes to a drastic
reduction in size, weight and production cost, compared to 35mm-format counterparts
with similar specifications.
PENTAX P-FA J 18-35mm F4-5.6 AL
Announced last year is the smc P-FA J 18-35mm F4.0-5.6 AL wide angle zoom lens for use with PENTAX 35mm-format autofocus SLR cameras. Featuring an ultra-wide 100-degree angle of view at the 18mm focal length, this compact interchangeable zoom lens produces high-quality images with minimal aberration, thanks to the incorporation of an aspherical lens element.
Featuring a simple, functional design without an aperture ring, this compact, high- performance zoom lens measures only 72 millimeters (2.8 inches) in diameter and 68.5 millimeters (2.7 inches) in length and weighs a mere 190 grams (6.7 ounces). It also features an angle-of-view coverage between 63 and 100 degrees and a minimum focusing distance of 0.28 meters (0.92 feet) for a maximum magnification of 0.18 times. It comes equipped with a lens hood to cut off excessive light and minimize flare and ghost images.
When mounted on the new PENTAX *ist DS2 digital SLR camera, this zoom lens offers focal
lengths equivalent to 27.5mm~53.5mm in the 35mm format to cover wide-angle to standard
|Lens Construction:||12 elements in 10 groups|
|Angle of View:||100 - 63 Degrees|
|Minimum Aperture:||F22 at 18mm, F32 at 35mm|
|Minimum Focusing Distance:||0.92 ft.|
|Size:||2.8" x 2.7"|
|Weight:||6.7 oz. w/o hood|
|Catalog No.:||27727 smc P-FA J 18-35mm F4.0-5.6 AL|
PENTAX-DA Zoom 16mm-45mm F4 ED AL
The compact, high-performance, interchangeable smc PENTAX-DA 16mm-45mm F4 ED AL lens features a 3X zoom ratio with focal lengths covering ultra-wide to moderate-telephoto ranges for the angle of view equivalent to 24.5mm-69mm in the 35mm format.
The DA-Series features a responsive "Quick-Shift Focus System" that allows photographers
to instantly switch the focus mode from auto to manual with a slight twist of the focus
ring. Coupled with a simple, functional design and the elimination of an aperture ring,
this new mechanism considerably improves the camera's operability. The lens also
incorporates an Extra-low Dispersion (ED) glass lens element and two aspherical lens
elements for true-to-life image reproduction and overall size reduction. The image circle
in DA-series lenses, including the smc PENTAX-DA 16mm-45mm F4 ED AL, is designed to
perfectly match the 23.5mm x 15.7mm size of the CCD used in PENTAX digital SLRs to optimize
camera performance. The new design also contributes to a drastic reduction in size, weight
and production cost, compared to 35mm-format counterparts with similar specifications.
|Lens Construction:||13 elements in 10 groups (two aspherical elements)|
|Angle of View:||83°-35° (with *istD body)|
|Minimum Aperture:||F22 (no aperture ring)|
|Minimum Focusing Distance:||0.92 ft (0.28m)|
|Size:||2.8" x 3.6" (72 x 92mm)|
|Weight:||12.9 oz. (365g) w/o hood|
smc PENTAX DA 40mm F2.8 Limited
The smc PENTAX DA 40mm F2.8 Limited lens. Designed for exclusive use with PENTAX digital SLR cameras, the unique pancake style standard lens measures a mere .59 inches in length and weighs just 3.17 ounces. Combined with the popular PENTAX *ist DS2 digital SLR, the PENTAX DA 40mm F2.8 Limited lens will offer the smallest and lightest digital SLR combination available from any manufacturer.
Featuring a sophisticated appearance that incorporates an aluminum lens barrel, hood and cap, the lens offers a perspective similar to the naked eye with its 40mm focal length (equivalent to 61mm in the 35mm format), a large maximum aperture of F2.8, and a minimum focusing distance of 40 centimeters.
The PENTAX DA 40mm also features the PENTAX Quick Shift Focus System for instant switching to manual focus operation, a nine blade diaphragm to assure true-to-life reproduction of out-of-focus areas, and filter attachment versatility (a 49mm-size filter on the lens or a 30.5mm-size filter on the lens hood).
|Lens mount:||PENTAX KAF mount|
|Lens construction:||5 elements in 4 groups|
|Angle of view:||39° ( when used with *istD, *istDS)|
|Number of diaphragm blades:||9|
|Metering system:||TTL open-aperture metering|
|Minimum focusing distance:||15.7 inches|
|Dimensions (diameter x length):||1.24 x 0.59 inches|
|Weight:||3.17 ounces (w/o hood)|
Pentax-DA 12mm-24mm F4 ED AL [IF]
PENTAX Imaging Company has announced yet another compact, lightweight, interchangeable zoom lens for exclusive use with PENTAX digital SLR cameras including the *ist D and the *ist DS2 series digital SLRs. The smc PENTAX-DA 12mm-24mm F4 ED AL [IF] is the sixth DA- series lens offered by the photo manufacturer. The PENTAX-DA 12mm-24mm F4 ED AL [IF] features:
- 2X zoom coverage in the ultra-wide angle range with an angle of view from 99 degrees to 61 degrees (equivalent in focal length from 18.5mm to 37mm in the 35mm format) when mounted on the PENTAX *ist D or *ist DS2 digital SLR camera body
- 13-element/11-group optical construction incorporating ED (Extra-low Dispersion) and aspherical optical elements
- The compact dimensions (diameter x length) of 3.3" x 3.4" (83.5mm x 87.5mm)
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