We recommend a domestic medium format lens: Lao Frog GF 17mm F4 D-Dreamer ZERO-D lens

  The medium format camera has a larger sensor size, so it has better picture quality performance in commercial photography and landscape photography; but for the medium format system, the number of lenses that can be selected is much less than that of the 135 camera. Today we recommend a domestic medium format lens: Lao Frog GF 17mm F4 D-Dreamer ZERO-D lens. This lens is a high-quality ultra-wide-angle lens, which can make up for the gap in the ultra-wide-angle Fujifilm system.

01 lens overview

  Among the domestically produced lenses in China in the past two years, Laohua focuses on wide-angle, shift-shift, and macro lenses, and has a high reputation among users. The GF 17mm F4 lens is an ultra-wide-angle lens used in the Fuji medium format system. On the Fuji GFX system, the equivalent focal length is about 13.5mm and the angle of view reaches 113 degrees. It is an out-and-out ultra-wide lens.

Old Frog 17mm F4 is a medium format with a viewing angle of 113 degrees Ultra-wide-angle lensLao Frog 17mm F4 is a medium-format ultra-wide-angle lens with an angle of view of 113 degrees

   For medium-format systems, F4 also belongs to the category of large aperture, so the lens positioning is relatively high. The lens has been officially released and is expected to be available at the end of this month. From the price point of view, the overseas price of the lens is 1,249 US dollars, which is equivalent to 8,600 yuan, while the domestic price is 7,980 yuan, which is lower than abroad. For the current domestic lenses, 8,000 yuan is considered the most expensive type of domestic lenses, but considering that this is a medium format lens and the widest and wide-angle of the GF mount, this lens is still worth the money.

  The biggest advantage of this lens is the ultra-wide angle, which is currently the widest focal length lens with GF mount. The Fuji original factory has an ultra-wide angle of 23mm f/4, and the equivalent focal length is actually only about 18mm. Of course, the old frog lens also has the Zero-D logo, which is the so-called “zero distortion” lens, so the distortion control is also a highlight.

D-Dreamer logo, this lens is a high-end lensD-Dreamer logo, this lens is a high-end lens

  In actual use, the sharpness of the lens left a deep impression on the author. This lens has good sharpness starting from f/4. With the medium format body resolution is very powerful. At f/4-f/22, the sharpness is in the usable range, which greatly improves the usability of the lens.

   For the old frog lens, I think this is a very good wide-angle lens with large aperture. Lens positioning and scenery shooting, starting from this positioning, the quality of all aspects of the lens is not only qualified, but also excellent. What are the advantages of this lens and what needs to be improved, let us continue to look down.

02 Appearance and Design

   This lens is not like our common wide-angle lens, which has a large aperture and short and thick body, but a relatively slender lens design, which should be Consider the factor of image field coverage. The overall workmanship of this lens is fine, especially the tightness design of the seams is relatively good, which can be regarded as a high-end design. In terms of size, the lens length is 124.5mm and the weight reaches 829g. Of course, as a medium format lens, this weight is completely acceptable.

The design of the old frog 17mm F4 lens is not like the traditional wide-angle, but Slender The design of the old Frog 17mm F4 lens is not like the traditional wide-angle lens, but rather slender.

  Although the lens looks slender, the lens filter diameter is still 86mm. Using a large diameter can improve the edge image quality and reduce the use The dark corners caused by the filter. The coating color of the lens foreground group is very gorgeous, showing orange + purple red. In actual use, the coating quality of this lens is not bad.

Although it looks slender, the lens diameter has reached 86mmAlthough It looks slender, but the lens has a diameter of 86mm

  Lao Frog. This lens uses a manual focus design. The lens has a detailed focus scale that can be used for fast focusing. It is worth noting that the closest focusing distance of the lens has reached 0.18m, and the maximum magnification is 0.28 times, which is in line with Lao Frog’s technical characteristics of macro. The lens aperture range is f/4-f/32, the aperture ring is moderately tight and feels good.

The lens has a fine focus scale, the recent focus is 0.18m The lens has a fine focus scale, and the recent focus has reached 0.18m

  . It is a pity that this lens does not have any electronic contacts, which means that it cannot directly record lens information and needs to be set manually.

The rear lens group, unfortunately the lens has no electronic chip The rear lens group, unfortunately, the lens does not have an electronic chip

  The old frog lens, from the workmanship to the hand feel is quite good, especially the focus experience. The focus scale of the lens is highly accurate, which can help to focus quickly, or directly use hyperfocal focus when the light is bad. Since the main purpose of this lens is landscape photography, we are most concerned about the quality of the lens. Let’s take a look at the objective test of this lens.

03 Lens objective test

Lens resolution test

   First, let’s take a look at the lens resolution test. In the test, I used Fuji GFX 50S as the test camera, and used the outdoor shooting environment to shoot.

   In the test, we intercepted the center area and the edge area to compare it to see how the lens actually performs.

lens resolution testlens resolution test

   in In the actual test, the center of the lens showed good image quality at f/4-f/22, and the image quality dropped significantly at f/32. The central part of the lens has better sharpness performance at f/4, f/8-11 is the best sharpness, but it is highly usable until f/22, which is very valuable for landscape shooting.

  In terms of edge sharpness, the image quality at f/4 has slightly decreased. Starting from f/5.6, the edge sharpness has increased, and the edge has reached a good level at f/8.

   Obviously, the main purpose of this lens is scenery shooting, so a good resolution is the first competitiveness of the lens. The author believes that the actual sharpness of the lens is very satisfactory, especially the excellent center sharpness under f/8-f/16, which provides more possibilities for landscape long exposure.

Lens distortion test

   The distortion performance of this lens is satisfactory. The lens is called Zero-D lens, that is, zero distortion lens, so the official is quite confident about distortion control.

lens distortion testlens distortion test

   in actual shooting At that time, the distortion control effect of this lens was pretty good. For a wide-angle lens, 0 distortion is more caused by the shooting angle. This lens has a good viewing angle under various angles and can provide a more realistic architectural restoration, so it is a good architectural photography lens.

Anti-glare ghost test

   Now let’s take a look at the lens’ anti-glare ability and dispersion test. In the previous tests of the old frog lens, the glare problem was a technical difficulty of the domestic lens. The coating of the old frog lens looked very gorgeous. Let’s take a look at the anti-glare performance of the lens with actual tests.

Forest environment anti-glare testForest environment anti-glare testDirect anti-glare testDirect anti-glare test

  In the woods environment, the old frog This lens performs well in both large aperture and small aperture glare. But when facing the sun directly, a certain amount of glare and ghosting appeared. The author thinks that the overall coating performance of this lens is acceptable, but there is still a certain amount of reflection inside, so ghost flare is prone to appear under direct light. The author believes that the coating technology of this lens is at a better level among domestic wide-angle lenses, and it is a passing performance among the original lenses.

Dispersion test

   is different from glare. The dispersion mainly depends on the optical design and lens technology of the lens. Lao Frog’s dispersion performance has always been good, and this 17mm wide-angle lens is the same.

High-light area dispersion performanceHigh-light area dispersion performanceBacklighting leaf dispersion performanceBacklighting leaf dispersion performance

   Dispersion generally appears most often at the edge of backlighting , Or the out-of-focus area of ​​the highlight. There is no obvious purple fringing on the old frog lens in these two areas, but a certain amount of red dispersion can be seen. Overall, the dispersion control of this lens is quite excellent, and there is basically no interference to the picture.

Vignette test

   In the actual test, the vignetting of the old frog 17mm f/4 is more serious, especially the vignetting under f/4 is more obvious, until f/11 It has eased. However, the vignetting of the medium format lens is generally heavier, not to mention that this is an ultra-wide-angle lens equivalent to 13.5mm. Such vignetting performance is acceptable.

Vignette test, only relieved under f/11 Vignetting test, f/11 only relieved

Blur and out-of-focus performance

   For this lens, out-of-focus performance is not an advantage. Since this lens has only 5 aperture blades, the out-of-focus light plate is not round from the beginning, and the pentagonal light spot can be clearly seen after the aperture is reduced. However, the main purpose of this lens is not to blur at a large aperture, so out-of-focus aberration is not a problem.

Out-of-focus performance, you can see a more obvious pentagonal spot Out-of-focus performance, you can see a more obvious pentagonal spot

   But it is worth mentioning that this lens has a close focus of 0.18m, so the blur under close-up is quite good. Take some impactful photos. In addition, the starburst of the lens is not serious, so there is no need to worry about the starburst under the small aperture affecting the overall effect of the picture.

04 test summary

   For the old frog 17mm F4 lens, the overall quality of the lens is satisfactory, especially from the high sharpness of f/4-f/22 Performance, this can fully demonstrate the resolution advantage of medium format cameras. The lens distortion control and dispersion control can reduce the unfavorable factors in landscape photography and improve the overall usability of the picture.

Old Frog 17mm F4 is an excellent medium format lens Lao Frog 17mm F4 is an excellent medium format lens

   For this lens, it belongs to a higher level of design among domestic lenses, and the level of workmanship is also quite good. It can be called a professional lens. However, this lens also has certain shortcomings. For example, the coating technology still has room for improvement, and the fewer aperture blades cause the out-of-focus spot to be not round enough.

   Overall, the advantages of this lens are quite obvious, and a few shortcomings do not affect the lens to become a high-quality large-aperture wide-angle lens. What’s more, this lens is a medium format image field. In a medium format system, such a specification is quite rare.

05 real shot samples

   Finally, let’s take a look at the real shot samples of this lens.

Old frog 17mm F4 real shot sampleOld frog 17mm F4 real Taking samplesLao Frog 17mm F4 real samplesLao Frog 17mm F4 real samples Old frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleLao frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleOld frog 17mm F4 real shot sampleLaowa 17mm F4 real shot sampleLaowa 17mm F4 real shot sampleLaowa 17mm F4 real shot sampleLaowa 17mm F4 real shot sampleLaowa 17mm F4 real shot samplesLaowa 17mm F4 real shot samples

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