YONGNUO 25mm 1: 1.7 STM ASPH Review (Model YN25mm F1.7M for Micro 4/3)

According provided by YONGNUO 25mm 1: 1.7 STM ASPH lens huge thanks directly company Yongnuo.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (model YN25mm F1.7M for Micro 4/3). increase.

Navigation

  1. In short
  2. History
  3. All lenses from Yongnuo
  4. Main Specifications
  5. Assembly
  6. Focusing
  7. Image quality
  8. Sample Photos
  9. My experience
  10. Similar lenses
  11. Price / where to buy
  12. Video review
  13. Results
  14. User Comments
  15. Add your review or question on the lens

In this review, I will refer to the YONGNUO 25mm 1: 1.7 STM ASPH lens for short. Yongnuo 25 / 1.7.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

In short

Yongnuo 25 / 1.7 is a fast auto focus prime lens for Micro 4/3 system. Primarily intended to serve as a standard lens for every day for a wide range of photographic tasks. It is suitable for Panasonic and Olympus Micro 4/3 system cameras, as well as other brands that create their photo and video cameras based on the Micro 4/3 (Kodak, Xiaoyi, Blackmagic, Yongnuo etc.)

In general, the lens is not bad. Of the obvious advantages: confident operation at F / 1.7, focusing stepper motor, light weight and very low cost.

First of all, Yongnuo 25 / 1.7 is an alternative for the original PANASONIC LUMIX G 1: 1.7 / 25 ASPH (about 250 $) и OLYMPUS M.ZUIKO DIGITAL 25mm 1: 1.8 MSC (about $ 400).

Of the obvious shortcomings: incompatibility with some cameras (mostly old models) and noisy operation of the diaphragm mechanism.

Important: reliably knownthat Yongnuo 25 / 1.7 will work correctly with Panasonic G100, GH5, G9, G95, G85, GX9, GX85, GF10, GF9, GF8 and Olympus E-M5 Mark II, E-M10 mark III, E-M10 IV cameras, E-PL9, E-PL10, PEN-F. How he will behave with other models is unknown.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

History

October 14 2019 year was officially announced YONGNUO 42.5mm 1: 1.7... It was the first lens from Yongnuo for the Micro 4/3 system.

В late summer 2020 the lens was officially introduced Yongnuo 42.5 / 1.7 II, which is an improved, modified version of the previous YONGNUO 42.5mm 1: 1.7.

Yongnuo 25 / 1.7 was officially presented в early February 2021 and became the third lens from Yongnuo for the Micro 4/3 system.

The company has 2 cameras with Micro 4/3 mount: YN450 M4 / 3 (introduced January 2021) and YN455 (Introduced July 2021).

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

All Yongnuo Lenses

Bayonet mount Sony FE (mirrorless full frame):

  1. Yongnuo 35 mm 1: 2 DF DSM S [review]
  2. Yongnuo 85 mm 1: 1.8 DF DSM S [review]

Bayonet mount Canon rf (mirrorless full frame):

  1. Yongnuo 35 mm 1: 2 DF DSM R [announce]
  2. Yongnuo 85 mm 1: 1.8 DF DSM R [announce]

Bayonet mount Sony E (mirrorless APS-C):

  1. Yongnuo 50 mm 1: 1.8 DA DSM S [review]

For the system Micro 4 / 3:

  1. Yongnuo 25 mm 1: 1.7 [review]
  2. Yongnuo 42.5 mm 1: 1.7 [review]
  3. Yongnuo 42.5 mm PM1:1.7 II [overview]
  4. camera Yongnuo YN455 Micro 4/3 systems [announce]
  5. camera Yongnuo YN450 Micro 4/3 systems [manufacturer's site]

Bayonet mount Nikon f (mirrored full frame):

  1. Yongnuo 14 mm 1: 2.8 [overview]
  2. Yongnuo 35 mm 1: 2 [overview]
  3. Yongnuo 40 mm 1: 2.8 [overview]
  4. Yongnuo 50 mm 1: 1.8 [review]
  5. Yongnuo 50 mm 1: 1.4 E [overview]
  6. Yongnuo 60 mm PM1:2 MACRO MF [overview]
  7. Yongnuo 85 mm 1: 1.8 [overview]
  8. Yongnuo 100 mm 1: 2 [overview]

Bayonet mount Canon EF (mirrored full frame):

  1. Yongnuo 14 mm 1: 2.8 [aliexpres]
  2. Yongnuo 35 mm 1: 2 [review]
  3. Yongnuo 35 mm 1: 1.4 [overview]
  4. Yongnuo 35 mm 1: 1.4C DF UWM [announce]
  5. Yongnuo 50 mm 1: 1.8 [overview]
  6. Yongnuo 50 mm PM1:1.8 II [overview]
  7. Yongnuo 50 mm 1: 1.4 [overview]
  8. Yongnuo 60 mm PM1:2 MACRO MF [aliexpres]
  9. Yongnuo 85 mm 1: 1.8 [review]
  10. Yongnuo 100 mm 1: 2 [review]

Lenses and cameras and many other products from Yongnuo can easily be found at Authorized Yongnuo Dealer / Store on Aliexpres.

My video on all Yongnuo lenses here.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Main Specifications YONGNUO 25 F1.7 STM ASPH

Review Instance Name On the body: YONGNUO 25F1.7 STM ASPH 0.2m / 0.66ft 0.2x STM ASPH

Near the front lens: Yongnuo Ø52mm

Mount side: serial number

Basic properties
  • M4 / 3 - lens designed for Micro 4/3 cameras
  • SMT / STM - focusing stepper motor
  • AF / MF - focus mode switch
  • FTM - continuous manual focus control
  • ASPH - aspherical elements in the optical scheme
  • Electronic focus ring
  • Internal focus
  • Multi-Enlightened Optics
  • Metal mount
  • Important: lens from a third-party manufacturer, which imposes some restrictions on its practical use
Front Filter Diameter 52 mm, plastic thread for filters
Focal length 25 mm, EGF is 50 mm
Zoom ratio 1 X (this is a fixed lens, it does not have a zoom)
Designed by for cameras of the Micro 4/3 system
Number of aperture blades 7 rounded petals
Labels Bayonet Mount Only
Diaphragm F / 1.7 to F / 22
MDF 0.20 meters, maximum magnification ratio 0.2X (ratio 1: 5)
The weight
  • in the instructions 150 grams (without caps)
  • according to my measurements 147 grams without caps
  • according to my measurements 168 grams with lids
Optical design 7 elements in 6 groups. The circuit includes 1 Yongnuo ED element and 2 aspherical elements

YONGNUO 25mm 1: 1.7 STM ASPH schematic (YN25mm F1.7M model for Micro 4/3)The optical scheme from a distance resembles PANASONIC LUMIX G 1: 1.7 / 25 ASPH

Lens hood Screws into the thread of the front filter, type unknown
Manufacturer country MADE IN CHINA (Made in China)
Period Since early 2021
Prices

Y0ngnuo classifies the Yongnuo 25 / 1.7 as a standard (in terms of focal length) lens ('STANDARD FIXED FOCAL LENS'). In terms of a full frame, the EGF of the lens is 50 mm, and the equivalent aperture in the understanding of depth of field is F / 3.4, as a result, in terms of the angle of view and depth of field, this lens is close to a full-frame 50 / 3.4.

Some Olympus models will have an in-camera stabilization system to make the Yongnuo 25 / 1.7 even easier to use.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Assembly

The lens came to the review completely new.

In a small box was a warranty card, instructions in Chinese and English, a certificate of quality control, a desiccant and the lens itself with a front and rear cover. The covers are made of thick plastic. In the box, the lens is mounted with two cardboard holders.

Yongnuo 25 / 1.7 has metal mount... The focusing ring is very wide, plastic.

The weight of the Yongnuo 25 / 1.7 lens is about 150 grams. Original PANASONIC LUMIX G 1: 1.7 / 25 ASPH. и OLYMPUS M.ZUIKO DIGITAL 25mm 1: 1.8 MSC... weigh a little less.

Diaphragm consists of 7 blades; on heavily covered apertures, the aperture has the shape of an irregular heptagon. During the closing / opening of the blades, the diaphragm is very noisy and has a small lag. Aperture noise on models Yongnuo 42.5mm 1: 1.7 и Yongnuo 42.5mm 1: 1.7 II much lower.

The hood is not a bayonet type and must be screwed into the thread of the front filter. The instructions do not indicate the marking of the original hood. It is not known which hood will fit this lens. The Yongnuo 25 / 1.7 has problems in the backlight, and therefore using a hood would be very desirable.

The design of the case is laconic, simple, pleasant in appearance, very similar to the design Yongnuo 42.5mm 1: 1.7 II.

It's important: During shooting under the scorching sun on a very hot day, the lens lost contact with the camera several times. Turning off the camera and reinstalling the lens fixed the problem.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Focusing

For focusing, Yongnuo 25 / 1.7 uses Yongnuo STM focusing stepper motor (the manual specifies a motor of the 'SMT' type). Auto focus should work with all Micro 4/3 cameras.

Focus speed average, quite comfortable for work, does not cause discomfort. On camera PANASONIC LUMIX DMC-GF2 I didn't have much focusing problems. The tenacity and focusing speed will most likely depend on the specific camera used.

Auto focus is very silent... The noise level during photo and video shooting is the same.

Lens uses electronic focus ring. The focus ring is plastic, wide, in manual focus mode it rotates approximately two to three full turns (depends on the rotation speed). When the extreme positions are reached, the ring does not rest, but continues to rotate. Focus manually very comfortably... I did not observe a delay when changing the direction of rotation. The focusing ring, during manual focusing, emits a perceptible and characteristic sound of two rubbing plastic parts.

There is a 'AF-MF' (auto focus / manual focus) mode switch on the lens body. During auto focus focus ring remains stationaryMoreover, it can be freely rotated 360 degrees without any effect on focus (if the corresponding function is enabled in the camera menu). Lens supports continuous manual focus controlbut only if allowed by the camera settings.

The lens has internal focusing, the front and rear lenses remain stationary during focusing. It is possible to use various filters without any problems.

The minimum focusing distance is only 20 cm, while you can get the maximum magnification for macro photography 1: 5, which is very, very good and better than similar PANASONIC 25 / 1.7 и OLYMPUS 25 / 1.8.

The Yongnuo 25 / 1.7 has a noticeable 'Focus Breathing' effect (changing the angle of view while focusing). When focusing towards the MDF, the angle of view decreases.

There are no useful marks on the focusing distance, depth of field, or anything else on the lens.

Interestingly: the lens has a huge infinity flight (sample shot with focusing to infinity turned all the way out).

Important: this is a third party lens. It may happen that it will not work on some cameras. For example, Yongnuo Yongnuo 25 / 1.7 may not be recognized by some cameras. Or, for example, on the camera PANASONIC LUMIX DMC-GF2 AF / MF switch does not work, lens always uses auto focus, even with switch set to 'MF' position. But you can enable manual focus through the camera menu. Due to the presence of constant manual focus control, this drawback does not spoil the overall impression of the lens.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Image quality

Yongnuo 25 / 1.7 easily handles 12MP CMOS camera sensor PANASONIC LUMIX DMC-GF2.

Sharpness

  • good sharpness at the open aperture in the center of the frame
  • in the corners of the frame, sharpness becomes acceptable after F / 2.8
  • in the corners of the frame, sharpness becomes good after F / 4 (there are no complaints at all about sharpness in the corners, which is very, very good)
  • good resolution in the center of the frame on covered apertures in the area of ​​F / 2.5
  • great resolution in the center of the frame on covered apertures in the area of ​​F / 4

Distortion

  • distortion is weak, barrel-shaped
  • the nature of distortion is unified, easily corrected in the editor

Vignetting

  • there is perceptible vignetting
  • vignetting is strongest at F / 1.7 and focusing at infinity (example)
  • vignetting decreases with focus towards MDF
  • vignetting almost disappears at f / 2.8-4
  • at closed apertures, the center of the frame becomes slightly darker than the periphery of the frame (abnormal vignetting behavior)
  • vignetting is easily fixable in the editor

Aberration

  • chromatic aberration fixed well
  • general level HA is on a par with similar quality lenses
  • there is a small friging (color of contrast zones of blur in green and purple)

Rest

  • the effect of the rays of the star is not pronounced (14 rays, example)
  • Blur disks are uneven on tightly covered diaphragms
  • the lens does not work well in backlight, in difficult conditions you can get an abundance of artifacts
  • at the edges and corners of the frame, the discs of confusion at F / 1.7 turn into lemons, the bokeh is slightly twisted (example)
  • concentric 'bulbous' grooves on discs of confusion due to the use of aspherical elements (example)

There is still no profile for this lens for popular RAW converters.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Sample Photos

Photos in the gallery below were taken with a camera. PANASONIC LUMIX DMC-GF2.Jpeg straight from the camera. A planar-like picture is felt. Some photos were taken using a polarizing filter. GREEN.L CPL 52mm.

Original JPEG '.JPG' photos can be view / download from this link (gallery on Goodle Drive, 130+ photos). Original photos in RAW format '.RW2' can be downloaded or viewed at this link (gallery on Goodle Drive). Per PANASONIC LUMIX DMC-GF2 many thanks to the store profotosale.com.ua.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

My experience

The release in 2021 of a lens for a Micro 4/3 system from a third-party manufacturer was a little surprised. Most likely the release of Yongnuo 25 / 1.7 is partially related to the release of its own camera. Yongnuo YN455 for Micro 4/3 system.

Yongnuo 25 / 1.7 is a simple, cheap and quite usable lens. Much like his older brothers Yongnuo 42.5mm 1: 1.7 и Yongnuo 42.5mm 1: 1.7 II.

Yongnuo 25 / 1.7 is a kind of affordable fifty dollars for the MFT system (Micro 4/3). It is optically better than inexpensive manual similar solutions, for example, 7Artisans 25 / 1.8 or PERGEAR 25 / 1.8.

In my opinion, Yongnuo 25 / 1.7 has only one serious problem - the original PANASONIC 25 / 1.7 on the secondary market it costs about $ 150, which is only slightly more expensive than the new Yongnuo 25 / 1.7.

Fun moment: on the box the inscription '0.19m / 0.6ft 0.2X' is sealed with a label of the corresponding color with the inscription '0.2m / 0.66ft 0.2x'. Apparently, the original design had slightly less MDF.

Yongnuo 25 / 1.7 can be conditionally attributed to the third generation of lenses from Yongnuo (watch this video). This generation includes fairly high-quality solutions.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Similar lenses

There are not so many such fast auto focus lenses for Micro 4/3:

  1. OLYMPUS M.ZUIKO DIGITAL 25mm 1: 1.2 PRO
  2. OLYMPUS M.ZUIKO DIGITAL 25mm 1: 1.8 MSC
  3. LEICA D SUMMILUZ 1: 1.4 / 25 ASPH.
  4. LEICA DG SUMMILUZ 1: 1.4 / 25 ASPH.
  5. PANASONIC LUMIX G 1: 1.7 / 25 ASPH.
  6. SIGMA 30mm 1: 1.4 DC DN | C (there is a version for Micro 4/3)
YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Price

Price for Yongnuo 25 / 1.7 is around 100-110 dollarswhich is a very attractive proposition. You can see prices for Yongnuo 25 / 1.7 on Aliexpress to Yongnuo Authorized Dealer at this link.

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

YONGNUO 25mm 1: 1.7 STM ASPH (Model YN25mm F1.7M for Micro 4/3)

Video by lens

/

Results

Yongnuo 25 / 1.7 is an inexpensive high-aperture standard fix for Micro 4/3. There are several childhood illnesses, but overall, the Yongnuo 25 / 1.7 has a very good value for money. Most importantly, the lens is good in the center of the frame at F / 1.7.

10 main advantages:

  1. low cost (about 110 $, for example, the price of the original OLYMPUS 25 / 1.8 is about 400 $)
  2. light weight, metal mount
  3. quiet focusing stepper motor
  4. internal focusing, fixed focus ring during auto focus
  5. there is a possibility of constant manual control
  6. small MDF, good ratio of maximum magnification for shooting at close range
  7. there is an AF / MF focusing mode switch (similar PANASONIC 25 / 1.7 и OLYMPUS 25 / 1.8 no switch)
  8. not bad aperture (the relative aperture is 12% larger than that of a similar OLYMPUS 25 / 1.8)
  9. one low-dispersion element and 2 aspherical elements in the optical scheme
  10. good optical performance. Moderate level of basic optical distortion (aberration, distortion etc.)

10 main disadvantages:

  1. there is a complete incompatibility with some old cameras (the lens is not recognized by the camera)
  2. AF / MF focus mode switch does not work with some cameras (lens always uses autofocus)
  3. no hood included; non-bayonet type hood
  4. the diaphragm control makes a noticeable noise
  5. there are no additional tags (depth of field, focusing distance, etc.)
  6. original lenses are more compact and with a smaller filter diameter (52 mm for Yongnuo 25 / 1.7, versus 46 mm for PANASONIC 25 / 1.7 и OLYMPUS 25 / 1.8)
  7. at high ambient temperatures, the lens may lose communication with the camera (may partially depend on the camera used)
  8. no USB port for firmware updates (many other lenses from Yongnuo have this option, for example, 50 / 1.8S DA DSM)
  9. the maintainability and endurance of the lens is unknown
  10. poor backlight resistance, noticeable vignetting at F / 1.7

Comments on this post do not require registration. Anyone can leave a comment. For the selection of a variety of photographic equipment, I recommend E-Catalog, Socket, M.videoand ebay и AliExpress.

Material prepared Arkady Shapoval... Look for me on Youtube | Facebook | VK | Instagram | Twitter | 500px.

Add a comment:

 

 

Comments: 11, on the topic: Review of YONGNUO 25mm 1: 1.7 STM ASPH (model YN25mm F1.7M for Micro 4/3)

  • Oleg

    It is immediately evident on the site that there are many owners of micra. Yagno tries to breathe a second wind into the world

    • Arkady Shapoval

      Relatively. IN group on FB news of the new Yongnuo 455 people clearly liked it,

      • Oleg

        Yes, I read, in principle, young people can enter a smartphone and a 2-in-1 camera, for instagram they don't need it anymore. You put some sort of snapseed for processing and do not bother with processing on your computer. Lacks a wide angle in the Yagno line or the stock zoom

  • Oleg

    In principle, there is not enough small dark 12-25, and so there is fifty dollars, 85 is

  • Oleg

    And all this is really cheap and compact to have 50 and 85mm in your pocket at a price of $ 200 for all this is cool. The grip is of course cut down, but for social networks there is enough blur

  • Ilyas

    will not work on the E-M10 mark II? ((

    • Arkady Shapoval

      Unknown :)

  • Denis

    To anyone interested, I can confirm that this lens is compatible with at least the Olympus Pen E-PL5 and I assume that the above will also be compatible with newer models ..

    • Arkady Shapoval

      Thank you

    • Denis

      More Compatibility Information:
      Olympus Pen E-PL1 - not compatible, the camera cannot see the lens.
      Panasonic Lumix G2 - compatible !!!, the glass is fully working (despite the fact that Yong 42,5mm is not compatible with this camera, 25 has surprisingly worked with a bang!)

  • Rostislav

    Does Olympus focus bracketing work?

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English-version of this article https://radojuva.com/en/2021/07/yongnuo-25mm-1-7-stm-asph-mft-micro-43-yn25mm/