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Pentax smc HD DA 21mm f/3.2 AL Limited

Pentax smc HD DA 21mm f/3.2 AL Limited lens
 

APS-C sized image

Lenses that create APS-C sized image are designed for digital only. They cannot be used on cameras that have image sensor larger than the APS-C format. These lenses are not suitable for film cameras either.

 

No Ultrasonic AF

Lenses with ultrasonic focusing mechanism tend to be quiter and faster than traditionally focusing lenses.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

No Low Dispersion lens element is used

Low Dispersion lens elements help to reduce chromatic aberration.

 

Not stabilized

Image stabilization helps to reduce blur caused by hand shake, especially at high focal length or in low light situations. Image stabilization can give 1 to 3 stop advantage over none stabilized lens, based on the reciprocal rule.

Pentax smc HD DA 21mm f/3.2 AL Limited Specification

Available mount(s) Pentax K
Application(s) Landscape, Interiors, Architecture
Category(s) Wide angle prime
Multiplier 1.5×
Stabilizer no
Focal length 21 mm (prime)
Lens construction 8 elements in 5 groups
Angle of view 35mm: N/A
digital: N/A
Number of blades 7
Maximum aperture f/3.2
Minimum aperture f/22
Minimum focusing distance 20 cm
Magnification 0.17×
Filter size 49 mm
Size ∅ 63 × 25 mm
Weight 134 g
Notes
AF speed N/A
AF sound
Internal focusing N/A
Internal zoom N/A
Fix front lens N/A
Mount type N/A
Weather sealed N/A
Drop in filter N/A
Ultrasonic AF no
Stepping motor AF no
APS-C sized circle yes
Low dispersion lens element no
Hard case N/A
Soft case N/A
Lens hood MH-RBB43 (not included)
Tripod adapter N/A
Pentax smc HD DA 21mm f/3.2 AL Limited Specification

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