Pentax K100D SLR Review
By Movable Type Admin
Shake Reduction, Lens Mount, AF System and Lenses
The new PENTAX K100D digital SLR incorporates a unique high-tech feature that helps deliver
sharp, blur-free handheld shots with any Pentax lens. This is particularly helpful in
situations where camera shake is an issue, such as with telephoto lenses, indoors without a
flash, or other low light conditions at dawn, dusk or at night.
The PENTAX Shake Reduction (SR) feature is an electromagnetically controlled system built into the body to detect handheld camera shake and compensates by moving a free floating image sensor. Unlike other DSLR optical anti-shake systems, this SR system delivers shake reduction with all PENTAX lenses ever manufactured without requiring a special series of bulky, expensive optics.
Based on a free-floating sensor design, PENTAX SR is superior to other sensor-moving
systems because it uses no guide rails, allowing the sensor to oscillate in three
directions--horizontally, vertically, and rotationally.
Over 30 patents have been filed for this SR system, which uses a ball-bearing-mounted oscillator unit with four electromagnets that hold the free-floating image sensor. Angular velocity sensors detect camera movement and relay the amount of compensation necessary to the electromagnets that move the sensor to compensate for any shake.
As a result, photographers can capture sharp images at a shutter speed that is 2 - 3.5 stops slower (e.g. 1/15 sec instead of 1/60 sec with a standard lens) than would otherwise be possible. The SR system provides a crucial advantage when shooting handheld with telephoto or tele-zoom lenses, at macro distances, or any other situation that magnifies the effects of camera shake. The SR system also helps considerably when taking non-flash pictures indoors or at dusk or other low light situations without using a tripod.
The K100D can not distinguish between panning movement and regular shake. Panning the camera with the Shake Reduction on may cause the shake reduction system to overcompensate during the exposure, thus causing blur. PENTAX therefore recommends turning SR off during a panning shot.
To provide optimal shake reduction, the camera must "know" the focal length of the lens in use.
Pentax F, FA, D-FA, and DA series lenses automatically relay focal length information to the camera.
With older lenses, the Pentax K100D allows users to manually input focal length information via the
Shake Reduction menu which allows focal lengths all the way from 8mm to 800mm.
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.
Aperture Ring Use
The K100D 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 K100D 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 K100D'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 50-200mm zoom becomes a 75-300mm lens!
11-Point TTL AF System
Featuring the advanced SAFOX VIII AF system incorporating eleven AF points,
the K100D automatically selects the most appropriate sensor for a given subject.
It also lets the user fix the sensor point on the middle sensor or choose
from any of the eleven for specific applications.
Using the menu screen, the user can select the preferred focus mode between Single AF,
which locks the focus when the shutter release button is half-depressed, and Continuous
AF, which adjusts the focus to the subject's movement. In Single AF the K100D operates in
focus priority, meaning that the shutter will not release until the subject is in-focus.
In Continuous AF the camera operates in release priority, meaning that the shutter will
release even if the subject is not in-focus
The working range of the
AF system is EV1 to EV19 at ISO 200 with 50mm f/1.4 lens.
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
This lens offers 4X zoom coverage in the telephoto range with 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
The smc P-FA J 18-35mm F4.0-5.6 AL wide angle zoom lens features 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 K100D 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 K100D 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 K100D 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 K100D 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)
Pentax-DA Fisheye 10mm-17mm F3.5-4.5 ED [IF]
Mounted on the PENTAX *ist D series of digital SLRs, the DA Fish-Eye
10-17mm lens will capture fish-eye imagery with a 180 degree angle of
view and a focal length of 10mm as well as super wide-angle performance.
Capture images with an expanded perspective including creative
deformation of subjects and sharp pan focus that extends throughout the
entire frame. 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 DA 21mm F3.2 AL Limited
This lens features a versatile angle of view and an ultra-thin, pancake design that offers go-anywhere portability that is ideal for casual, day-to-day snapshot photography. The latest lens inherits all the attributes of the acclaimed PENTAX Limited lens series including high-quality image reproduction, distinctive visual description, and high-grade lens-barrel finish.
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