Development of the LEICA DG 25-50mm F1.7 Micro Four Thirds lens was announced at the same time as the Lumix GH5 II and GH6 back in May 2021, but Panasonic gave no indication of its specifications beyond its headline features: a focal range of 25-50mm (50-100mm equivalent) and an unprecedented constant F1.7 maximum aperture.
It's a lens likely to appeal to both stills photographers and videographers who need the ultimate in bokeh and low light shooting capabilities, and don't might the weight and likely expense of such a fast lens. Its 50-100mm equivalent focal length makes it a short telephoto zoom with an extremely wide maximum aperture. The only comparison we can think of are the Sigma 18-35mm f/1.8 and 50-100mm f/1.8 APS-C DSLR lenses.
Leaked Leica DG 25-50mm F1.7 specifications
Panasonic may be saying nothing about the new lens's specifications, but these details have been leaked by respected rumor source Nokishita:
• Optical configuration: 16 elements in 11 groups (1 aspherical lens, 3 ED lenses, 1 UHR lens)
• Minimum focus distance: 0.28m ( at25mm)/0.31m (at 50mm)
• Maximum magnification: 0.21x (35mm format equivalent 0.42x)
• Filter size: 77mm
• Dimensions: 87.6 x 127.6mm
• Weight: 654g
These specifications don’t expand greatly on what Panasonic has already revealed about this lens, except to confirm that it will be a substantial optic definitely designed for light-gathering power rather than compactness.
It’s not the first F1.7 constant aperture zoom from Panasonic. The new lens will join the existing LEICA DG VARIO-SUMMILUX 10-25mm F1.7 ASPH launched in 2019. As Panasonic points out, photographers and videographers will soon be able to span a focal range of 20-100mm (full frame equivalent) at a constant F1.7 aperture with just two lenses.
Panasonic has made it clear all along that it will continue to support the Micro Four Thirds format, even though it has put so much development into its full frame Lumix S system. The company sees the Lumix G and Lumix S systems as distinctly different, each with its own strengths and with its own user base.