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Panasonic LEICA DG VARIO-SUMMILUX 25-50mm F1.7 ASPH. is a high-end standard-mid-telephoto zoom lens designed for the micro-four-thirds system. Panasonic boasts the lens' f/1.7 maximum aperture as the first in telephoto zoom lenses in the world, though the fact that the MFT system has a 2x crop factor makes this an easier feat to achieve.
The LEICA DG VARIO-SUMMULUX 25-50mm is designed to pair with the 10-25mm F1.7 to cover most common focal lengths, with it covering the 35mm full-frame equivalent focal lengths of 50-100mm.
As the Leica name attests, this lens emphasizes optical performance above all. Hence, it is relatively bulky at 654 grams and requires 77mm filters. For this price, the photographer gets a highly-corrected lens with minimal optical aberrations and best-in-class resolution.
Another highlight is the lens' focus ring, which also acts as an AF-MF switch.
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Specifications
Construction
Aperture Blades
9 circular aperture diaphragms
Image Size
Full-frame
Lens Mount
Micro Four Thirds mount
Optical Formula | Elements
16 elements
Optical Formula | Groups
11 groups
Optical Formula | Special Glass
1 aspherical lens, 3 ED lenses, 1 UHR lens groups
Dimensions
Filter Diameter
77 mm
Size | Diameter
87.6 mm
Size | Length
127.6 mm
Weight
654 g
Function
Angle Of View
47° ~ 24°
Aperture
F/1.7 ~ f/16
Focal Length
0.28 m / 0.92 ft @ 25mm, 0.31 m / 1.02 ft @ 50mm
Focal Length (35mm Equivalent)
50-100 mm
Operating Temperature
-10°C ~ 40°C
Weather Resistance
Dust, moisture
Zoom Type
External zoom
Performance
Max Magnification
0.21x @ 50mm
Min Focus Distance
0.37 m
Production
Debut
2021-07-08
Model Name
H-X2550
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