This coating reduces the reflection rate up to 50% more than the conventional coating (compared to PENTAX multicoating) for reduced flare and ghosting even under backlighting and other adverse conditions where strong point light sources can enter the lens.
Round iris diaphragm
A 9-blade, round iris diaphragm is used. This enables natural reproduction of illumination and other scenes and softer out-of-focus (bokeh) effects for making the subject stand out more prominently from the background.
ED (Extra-low Dispersion) Glass/Anomalous Dispersion Glass
ED (Extra-low Dispersion) Glass and Anomalous Dispersion Glass are used to minimize color blurring over the entire zoom range and even at the edges of the image for providing superior resolution.
Internal lens motor AF
For the first time, the Limited series now uses a DC motor inside the lens barrel for providing a focusing mechanism. Compared to body AF, this focusing mechanism provides a quieter drive sound and smoother AF operation.
Photography when exposed to water or sudden rainfalls A weather-resistant construction is used for overcoming adverse conditions. The focus ring and zoom ring also have a weather-resistant design for preventing the entry of water.
Machined Aluminum Material
The lens barrel, cap, and hood use a machined aluminum material. You will feel the presence and elegance of the Limited series whenever you look at or touch this lens.
– Type: Normal Zoom
– Focal length (Equivalent to 35mm format): 20-40mm(30.5-61.5mm)
– Maximum aperture: f/2.8-4
– Minimum aperture: f/22-32
– Angle of View: 70°-39°
– Lens construction: 9 elements / 8 groups
– Number of diaphragm blades: 9
– Closest focusing distance: 0.28m
– Maximum reproduction ratio: 0.20x
– Filter size: 55mm
PENTAX Pentax / Ricoh RICOH HD DA 20-40mm f/2.8-4 DC WR Limited w/c Black Lens