As an Amazon Associate I earn from qualifying purchases from

Panasonic Leica 25-50mm F1.7 ASPH discipline overview: Digital Pictures Assessment


Panasonic’s Leica DG Vario-Summilux 25-50mm F1.7 ASPH is a shiny zoom lens aimed toward photographers utilizing Micro 4 Thirds digicam our bodies.

With a 35mm-equivalent focal vary of fifty to 100mm, the 25-50mm F1.7 might make for a horny – if considerably uncommon – portrait lens for nonetheless photographers. However it’s clearly been designed firstly for video seize, the place it makes a very nice companion for Panasonic’s present 10-25mm F1.7 lens.

Accessible from August 2021, checklist pricing is ready at $1799.99.

All pictures edited in Adobe Digicam Uncooked 13 with changes restricted to white stability, publicity, highlights, shadows, white and black ranges. Sharpening and noise discount at ACR defaults. Photos have been captured utilizing lenses that have been bodily pre-production, however ultimate optically.

Key specs:

  • Focal size: 25-50mm (35mm-equivalent: 50-100mm)
  • Aperture vary: F1.7 – F16
  • Stabilization: No
  • Filter thread: 77mm
  • Shut focus: 0.28m (11.0″)
  • Most magnification: 0.21x (35mm-equivalent 0.42x)
  • Diaphragm blades: 9
  • Hood: Included
  • Weight: 654g (1.44 lb)
  • Optical development: 16 parts in 11 teams (1 aspherical, 3 ED, 1 UHR)

With 35mm-equivalent focal lengths starting from 50 to 100mm, the Leica 25-50mm F1.7 stands out from extra widespread focal lengths like the broader 24-70mm or extra telephoto 70-200mm zooms provided by many producers. It is most likely not too shocking, then, that there aren’t actually any direct opponents.

The closest we might discover for the Micro 4 Thirds mount is the Olympus M.Zuiko Digital ED 12-40mm F2.8 Professional, which is successfully a 24-80mm, however that is nonetheless a very good deal wider than Panasonic’s lens. And whereas it carries Olympus’ Professional designation, it is nonetheless solely slightly greater than half the value of the slightly extra area of interest 25-50mm F1.7, regardless of providing related ranges of weather-sealing and the identical autofocus drive sort.

ISO 400 | 1/1600 sec | F1.7 | 100mm equiv. | Panasonic GH5
Photograph by Jordan Drake

Olympus’ lens can also be way more compact and light-weight as you’d count on given its considerably less-bright most aperture, and it could focus even nearer to ship a greater most magnification. The Panasonic / Leica lens has a nine-bladed aperture, versus the seven-bladed iris of the Olympus, although.

With no actually shut opponents, it most likely makes extra sense to focus as a substitute on which lens the 25-50mm F1.7 will pair finest with, and right here there is a very clear decide. With near-identical dealing with, to not point out related value tags and the identical videocentric design objectives, this optic is clearly meant for use alongside the Panasonic Leica DG Vario-Summilux 10-25mm F1.7 ASPH lens.

ISO 200 | 1/5000 sec | F2.8 | 50mm equiv. | Panasonic GH5 II
Photograph by Dan Bracaglia

The obvious signal of Panasonic’s intent will be inferred from the truth that each lenses, regardless of their differing focal lengths, share primarily the identical physique design, proper all the way down to the scale and placement of their management rings. That not solely offers for muscle-memory familiarity when switching between the pair, however for videographers particularly, additionally makes them better-suited to make use of with the identical follow-focus system setup as you swap backwards and forwards between lenses.

Each lenses are additionally very closely-related when it comes to their weight and stability, which ought to make sure that gimbals can settle for both lens with out want for changes to compensate for the optic in use. And at their shared 25mm focal size, each lenses additionally present near-identical shade and distinction, making it simpler to match your photographs.

ISO 320 | 1/80 sec | F5.6 | 74mm equiv. | Panasonic GH5 II
Photograph by Richard Butler

And naturally, since they share the identical total physique design, each lenses additionally settle for the identical 77mm filter sizes. They’re additionally each weather-sealed and share nine-bladed apertures. The largest distinction is in the usage of a linear motor-driving AF system for the 25-50mm slightly than a stepper motor-based system within the 10-25mm, giving larger AF efficiency to the extra telephoto lens of the pair, the place it is extra prone to be wanted.

In comparison with…

Panasonic Leica 25-50mm F1.7 Olympus 12-40mm F2.8 Professional Panasonic Leica 10-25mm F1.7

Worth (MSRP)

$1799.99 $999.99 $1799.99
Optical development 16 parts, 11 teams 14 parts, 9 teams 17 parts, 12 teams
Aperture blades 9 7 9
Climate sealed Sure Sure Sure
AF drive Linear motor Linear motor Stepper motor
Minimal focus distance / max magnification 0.28 m (11.0″) / 0.21x 0.20 m (7.9″) / 0.30x 0.28 m (11.0″) / 0.14x
Filter measurement 77mm 62mm 77mm
Diameter x Size
(no hood)

87.6mm x 127.6mm (3.5″ x 5.0″)

69.9mm x 84mm (2.8″ x 3.3″) 87.6mm x 127.6mm (3.5″ x 5.0″)

654g (23.1oz)

382g (13.5oz)

690g (24.3oz)

Dealing with

The Leica 25-50mm F1.7 is a reasonably chunky lens, with a barrel diameter of 87.6mm (3.5″) and a size of 127.6mm (5.0″), however that is to be anticipated given its shiny most aperture. And its development actually befits its price ticket, with a stable all-metal design together with metallic management rings.

However regardless of its measurement, stable construct and the sheer variety of glass parts inside, it is pretty light-weight for a lens of its sort, tipping the scales at round 654g (23.1oz). And we discovered it to stability properly on cameras with a decently-sized handgrip just like the Panasonic GH5 and GH5 II with which we shot our pattern galleries.

These three rings present for management of zoom, guide focus and aperture. The guide focus ring features a clutch mechanism, permitting you to rapidly shift focus modes just by sliding the ring backwards and forwards.In all, there are three nicely-knurled rings encircling the physique of the lens, and these function the one bodily controls. All three flip very easily and provide simply sufficient resistance to permit for straightforward operation both with a fingertip alone, or with motorized equipment and the like.

The aperture ring, in the meantime, has a near-stepless design that is ideally fitted to cinematography, permitting for easy and gradual aperture modifications throughout video seize. It isn’t fairly solely stepless, as that is nonetheless a fly-by-wire system, however Panasonic’s micro-step aperture drive has enough accuracy to make the person steps all however invisible.When it is pulled backwards a scale indicating the focal distance is uncovered. The conduct of the ring concurrently modifications from its default speed-sensitive management to as a substitute present linear management, permitting for exact, predictable and repeatable focus changes.

Sadly, there isn’t any approach to allow click on detents for the aperture ring, however there’s a easy answer in case you want extra exact aperture management. You possibly can merely place the ring in its Auto place, as denoted by a crimson letter A, after which use the controls in your digicam physique to set the aperture worth as a substitute.The aperture drive can also be silent, and with no clicks from the aperture ring itself, you needn’t worry aperture modifications being picked up in your audio observe both. And the ring has enough throw to reduce the chance of considerably altering the aperture worth by mistake.

No optical picture stabilization is offered, though you may in fact depend on the in-body picture stabilization of your digicam, if accessible. It is nonetheless a little bit of a disgrace, although, because it means you may miss out on the even higher corrective energy provided by the Twin I.S. techniques that make the most of in-body stabilizers in tandem with lens stabilizers that is accessible on some our bodies.The lens can also be comprehensively weather-sealed, not simply with a gasket on the interface between the lens and physique, but in addition on the particular person controls and seams between the lens’ element components. Panasonic describes the 25-50mm F1.7 as each splash and dustproof, and says it’s also freezeproof to -10ºC (14ºF).

Up entrance, you may discover 77mm threads with which to connect your alternative of filters, and a locking hood (proven above) is included with the lens.

Again to high

Autofocus and focus respiration

Though guide focus was clearly a precedence for the Leica 25-50mm F1.7, Panasonic hasn’t uncared for autofocus within the least. A linear autofocus motor offers for each very swift and silent autofocus, taking advantage of the corporate’s quickest AF techniques which may pattern focus distance info a whopping 240 instances per second (when taking pictures stills).

The result’s a lens that may rack from its minimal to most focus distance in underneath half a second – as a way to be assured of maintaining with the motion for typical topics like avenue pictures, even allowing for the lens’ shallow depth of discipline.

ISO 200 | 1/800 sec | F2 | 80mm equiv. | Panasonic GH5 II
Photograph by Dan Bracaglia

Handbook focus operation, too, is easy, silent and correct. As with most mirrorless lenses, it does not function mechanically, however though it is a fly-by-wire system it operates precisely as if it have been mechanically coupled when the focusing ring is within the guide place, offering good repeatability.

And in case you favor swifter shifts in guide focus distance, switching the main focus clutch again out of guide mode and deciding on guide deal with the digicam offers you speed-sensitive management as a substitute.

ISO 200 | 1/60 sec | F1.7 | 100mm equiv. | Panasonic GH5
Photograph by Jordan Drake

This is not by any means a macro lens, however the 25-50mm F1.7 affords good close-up functionality. The minimal focusing distance varies solely barely from 28cm (11″) on the vast finish of the vary to 31cm (12.2″) at telephoto. The latter interprets to a most magnification of round 0.21x, which equates to 0.42x magnification on a full-frame digicam.

We have already mentioned the 25-50mm’s bodily design, stepless aperture management and focus clutch, all of that are boons for videographers, however the excellent news does not finish there. Additionally it is extraordinarily nicely managed in relation to focus respiration, that means that you could refocus with out noticeably altering your framing, no matter whether or not you are taking pictures on the vast or telephoto ends of the zoom vary.

ISO 200 | 1/3200 sec | F1.7 | 100mm equiv. | Panasonic GH5
Photograph by Chris Niccolls

Actually, the one downsides for video use are the dearth of in-lens stabilization and the truth that this is not a parfocal lens. What which means is that in case you alter the focal size, it would additionally change the focal distance. Because of this, zooming in or out will necessitate an adjustment to focus.

Again to high

Picture high quality

At this value level and given its measurement, you’d count on picture high quality to be good to nice, and Panasonic’s Leica 25-50mm delivers. The bokeh is not excellent when specular highlights are current, however is however good total, and detail-gathering is excellent even when taking pictures wide-open.

ISO 200 | 1/1250 sec | F3.2 | 60mm equiv. | Panasonic GH5
Photograph by Chris Niccolls


The 25-50mm F1.7 does an awesome job in relation to central sharpness. Even when taking pictures wide-open, picture facilities are very, very sharp throughout the zoom vary, and stopping down slightly can ship no enchancment on that sharpness. We did see slightly enchancment within the corners when stopping all the way down to F2.8, nevertheless, particularly in the direction of the longer finish of the zoom vary.

ISO 200 | 1/50 sec | F2.8 | 100mm equiv. | Panasonic GH5
Photograph by Jordan Drake


This lens can even ship good ends in the bokeh division, giving nice alternatives for topic isolation when taking pictures wide-open, particularly at nearer focal distances. The one actual draw back is with specular highlights, which could be a bit busy as a result of noticeable onion ring impact. There’s additionally some noticeable cats-eye impact, seen within the picture under, but it surely’s not too excessive and due to this fact not too distracting.

ISO 200 | 1/1000 sec | F1.7 | 100mm equiv. | Panasonic GH5
Photograph by Chris Niccolls

Flare, ghosting and sunstars

Panasonic features a fairly deep, tube-style lens hood within the product bundle, which attaches to the entrance of the lens with a button-released catch that properly prevents unintended disconnections.

The lens reveals a formidable resistance to each flare and ghosting when taking pictures into shiny gentle sources, although you may get some ghosting to look in case you strive arduous sufficient. However more often than not, as you may see under, ghosting simply is not an issue. Sunstars are of the 18-pointed selection, courtesy of the 9 aperture blades the lens makes use of, they usually’re of excellent high quality if not one of the best we have seen. The spikes could be a little uneven in size and have a tendency to diffuse slightly rapidly.

ISO 200 | 1/400 sec | F16 | 50mm equiv. | Panasonic GH5 II
Photograph by Dan Bracaglia

Longitudinal / lateral chromatic aberration (fringing)

Though we did see slightly little bit of longitudinal chromatic aberration or LoCA, which causes shade fringing within the foreground and background and will be arduous to right post-capture, it was fairly common and manageable, and never one thing we would be involved about.

As for lateral chromatic aberration or LaCA, we did not discover this to be a difficulty.

Colour fringing in areas in entrance of and behind the aircraft of focus is very well managed.
ISO 200 | 1/ 2500 sec | F1.7 | Panasonic GH5
Photograph by Chris Niccolls

Again to high


What we like What we do not
  • Strong, high-quality development
  • Comprehensively weather-sealed
  • Very shiny F1.7 most aperture
  • Very sharp even when wide-open
  • Stepless aperture management
  • Quick and silent autofocus drive
  • Helpful focus clutch and exact guide focus management
  • A wonderful complement to the Leica 10-25mm F1.7 lens
  • Fairly dear
  • Pretty chunky design
  • No in-lens stabilization
  • No on-demand click on detents for aperture management from the lens itself
  • Bokeh reveals some onion-ring in specular highlights

With the Leica DG Vario-Summilux 25-50mm F1.7 ASPH, Panasonic has clearly targeted on an unanswered hole within the Micro 4 Thirds lens market. That is no dangerous factor, but it surely does imply that this is not a lens for everybody, as its slightly uncommon focal vary would possibly recommend.

But when you end up in that area of interest – maybe already proudly owning the externally related 10-25mm F1.7 and craving a bit extra telephoto attain for video taking pictures or portrait stills – then this lens has so much to supply.

ISO 200 | 1/1600 sec | F2.8 | 100mm equiv. | Panasonic GH5 II
Photograph by Dan Bracaglia

Panasonic’s consideration to element in designing these two lenses to work hand-in-hand is each spectacular and considerate. Not solely has it given each optics the very same physique and management format, but it surely has additionally matched the look of each lenses nicely the place their focal ranges meet. That can imply much less work for videographers each within the discipline, and when it comes time to get all the way down to modifying.

We already beloved the sooner 10-25mm F1.7, and this lens is an extension of every part we beloved concerning the earlier one. Like that optic, it is a pleasure to shoot with whether or not utilizing autofocus or pulling focus manually, and it delivers nice picture high quality in most respects as nicely.

ISO 200 | 1/400 sec | F2 | 76mm equiv. | Panasonic GH5 II
Photograph by Dan Bracaglia

Sure, it’s fairly dear, however that is to be anticipated in a distinct segment product, and doubly so in a videocentric lens like this one. And even for photographers who’ll by no means shoot video, it’s just about the one recreation on the town if you’d like a very quick, native portrait zoom.

Can it justify that price ticket? That can rely upon what you are taking pictures, however for videographers particularly, we expect you may be thrilled with it.

Again to high


Again to high

DPReview TV overview

See what our staff at DPReview TV has to say concerning the Panasonic Leica 25-50mm F1.7 ASPH.

Again to high

Pattern galleries

Please don’t reproduce any of those pictures with out prior permission (see our copyright web page).

Panasonic GH5 II (DPReview HQ gallery, pre-production however optically ultimate lens)

Panasonic GH5 (DPReview TV gallery, pre-production however optically ultimate lens)

Again to high

We will be happy to hear your thoughts

Leave a reply

Product Must Haves
Enable registration in settings - general
Compare items
  • Total (0)