Equipment Challenge Stage 05 Longteng 90 Micro Lens on Canon Budweiser

Budweiser? Lenses, that is, macro lenses with a focal length of 100mm (sometimes including 100mm or so), are very frequently used in macro photography. Because of the long focal length of this lens, a large proportion of images can be obtained from a long distance, which reserves flexible space for lighting and composition. At the same time, a longer focal length is also conducive to creating a soft Jiao Wai effect.

Longteng SP DIAF 90 mm 1: 2.8 macro 1: 1 and Canon EF 100mm 1:2.8 USM (click here to view larger image.

)

In addition to the original 100 micron lens, the three major factories have also introduced macro lenses with similar focal lengths, which can also reach the maximum magnification of 1: 1. Moreover, the price of these lenses often has obvious advantages over the original lenses. So what about the performance of these lenses? How many issues will we pass? Equip the ring? Compare one by one, and find out what this kind of lens is. Lord lei? .

Jiao Wai's gentle photo taken by Longteng SP DIAF is 90 mm1:2.8macro1:1.

Among the three sub-factories, Longteng SPDIAF 90mm1:2.8macro1:1lens is a macro lens that attracts wide attention. This paper will make a detailed performance comparison with Canon's EF 100mm 1:2.8 USM macro lens. Quan Huafu EOS 5D Mark II fuselage was used as the test platform.

Compared with Canon EF 100mm 1:2.8 USM, Longteng's lens structure is simpler, and the filter aperture and the whole lens are smaller and lighter. Spdiaf 90mm1:2.8macro1:1adopts more 9 diaphragm blades to obtain a more regular and smooth diaphragm shape, thus achieving a soft Jiao Wai image effect. In addition, from the lens logo, we can know that Canon EF/KOOC-0/00 mm/KOOC-0/:2.8 USM lens uses ultrasonic focusing drive motor, while Longteng SPDIAF 90 mm/KOOC-0/:2.8 macro/KOOC-0/only uses ordinary drive motor. The following is a detailed specification comparison between the two:

"Longteng 90mm 1:2.8

"Canon 100 mm 1:2.8

"lens structure

10 tablets /9 groups

12 tablets /8 groups

"shooting perspective

27?

24?

"Aperture blade number

nine

eight

"The nearest focal length.

0.29 m

0.3 1 m

"The maximum picture magnification.

1: 1

1: 1

"Filter aperture

55 mm

58 mm

"weight

405 grams

580 grams

"diameter x length

7 1.5x97

78.6 x 1 18.6 mm

"attachment

Hood, lens bag

"bayonet

Canon Nikon Pentax Sony

General regulations

As a member of Longteng SP series, SPDIAF 90mm1:2.8macro1:1lens performs quite well in product technology, and the components are tightly assembled, even the outer texture of the lens barrel is fine and uniform.

Longteng SP DIAF 90 mm 1: 2.8 macro 1: 1 and Canon EF 100mm 1:2.8 USM (click here to view larger image.

)

Longteng SP DIAF 90 mm 1: 2.8 macro 1: 1 and Canon EF 100mm 1:2.8 USM (click here to view larger image.

)

Compared with Canon EF 100mm 1:2.8 USM, the lens appearance of Longteng SP DIAF 90 mm 1: 2.8 macro 1 is shorter. However, Canon EF 100mm 1:2.8 USM adopts internal focus design, and the overall length of the lens does not change with the focus state; When Longteng SPDIAF is 90mm1:2.8macro1:kloc-0/focusing at close range, the front lens barrel will be extended by about 50mm, which is longer than Canon EF 100mm 1:2.8 USM lens. Since the closest focusing distance of Longteng SPDIAF 90 mm1:2.8 macro1:kloc-0/is already slightly smaller than Canon EF 100mm 1:2.8 USM, the subject will be very close to Longteng SPDIAF 90 mm/kloc in the recent focusing state.

Longteng spdiaf 90mm1:2.8macro1:1lens (click here to view larger image.

)

Longteng spdiaf 90mm1:2.8macro1:1The lens adopts push-pull design, and the photographer can switch the focus mode by pushing and pulling the focus ring, which is very convenient. But what about this? Clutch? Occasionally, the mechanism is not completely matched, resulting in occasional manual focusing operation. Hang your teeth? problem Compared with canon EF 100mm 1:2.8 USM, SP DIAF 90 mm 1: 2.8 macro 1 has more obvious vibration and noise when focusing. The working resistance feedback of spdiaf 90mm1:2.8macro1:1focusing ring is hard, but it is uniform as a whole. Longteng SPDIAF 90 mm1:2.8 macro1:1has a large operating stroke, about 270 degrees, which is suitable for detailed focusing adjustment, while Canon Budweiser's focusing ring operation is only about 150 degrees.

Longteng spdiaf 90mm1:2.8macro1:1(click here to view the larger image.

)

Longteng spdiaf 90mm1:2.8macro1:1lens provides a focus range splitting switch, through which the focus distance of the lens can be limited to far, near or unlimited. This can save some focusing time when shooting different subjects. This design is more practical than Canon's focus range limit switch, because the focus range limit function of Canon EF 100mm 1:2.8 USM can only be limited to a long distance or not.

Longteng spdiaf 90mm1:2.8macro1:1front end (click here to view larger image.

)

Longteng spdiaf 90mm1:2.8macro1:1lens holder (click here to view larger image.

)

Because the focal length of Longteng SPDIAF 90 mm1:2.8 macro1:kloc-0/lens is shorter, it needs a shorter focal length to achieve the same 1: 1 magnification, which will bring some troubles when shooting some sensitive objects, because being too close may affect the lighting effect or disturb. Then if we shoot on the same plane with Longteng SP DIAF 90 mm 1: 2.8 macro1:kloc-0/and Canon EF 100mm 1:2.8 USM, the visual field will be different and the magnification of the picture will not be consistent. The following is a comparison of pictures taken by two lenses on the same plane:

Longteng spdiaf 90mm1:2.8macro1:1shot.

Canon EF 100mm 1:2.8 USM shooting.

Besides the sharpness of macro lens, image softening of Jiao Wai objects is also very important. Soft Jiao Wai effect helps to create a constantly changing photo atmosphere, which looks more natural. The following is the same object taken by Longteng SPDIAF 90mm1:2.8macro1:kloc-0/and Canon EF 100mm 1:2.8 USM with full aperture. We can observe the fuzzy effect of foreground and background:

Longteng spdiaf 90mm1:2.8macro1:1shot.

Canon EF 100mm 1:2.8 USM shooting.

It seems that the out-of-focus object of Longteng SPDIAF 90 mm1:2.8 macro1:1has a softer blur, but the difference is extremely subtle. Even the photos taken by Canon SPDIAF 90mm1:2.8macro1:1,the Jiao Wai effect is very feminine.

In the imaging test, according to the method provided in the Imatest software reference, we use the test prototype to shoot the test target for many times under the illumination of 5000K standard color temperature lamp (the color rendering index is greater than 95%), and then use Imatest software to analyze and get the numerical value, and select the numerical value that can represent the average level or the average value of many tests to be listed in this paper.

Enhanced ISO 12233 Resolution Test Target

When testing the imaging resolution, we use the aperture priority mode of the test prototype and use the sensitivity of ISO 100 to shoot the test target that enhances the resolution of ISO 12233. The photos are stored in 16-bit RAW format, then converted to TIFF format without compression and sharpening, and then the local objects in the center and edge areas of the image are numerically analyzed by Imatest. The above is the resolution test target shot by spdiaf 90mm1:2.8macro1:1,and the red marked area is the test sample area. We use the MTF50 value obtained by Imatest analysis as a reference to examine the imaging resolution of the camera. The MTF50 value of the test results (unit: LW/PH, line width/image height) indicates the maximum number of black and white lines that the camera can distinguish per imaging height (contrast is 50%). The higher the numerical value, the higher the imaging resolution of the camera (lens).

According to the test results, Canon EF 100mm 1:2.8 USM still has obvious advantages in imaging clarity, mainly in large aperture. That is to say, Canon EF 100mm 1:2.8 USM is sharper than Longteng SP DIAF 90 mm 1: 2.8 macro 1: 1. In addition, at the edge of the picture, the image sharpness of the two shots has decreased, and the difference of sharpness ratio between the two shots at the edge has been greatly reduced, which shows that the sharpness of Longteng SPDIAF 90 mm1:2.8 macro1lens is more balanced in the whole picture range. The following is the contrast of imaging visual resolution between Longteng SPDIAF 90mm1:2.8macro1:kloc-0/and Canon EF 100mm 1:2.8 USM at f/4 aperture:

Longteng spdiaf 90mm1:2.8macro1:1shot.

EF 100 mm 1:2.8 American Standard

Imaging dispersion: When analyzing imaging dispersion, we use the same analysis object as in the resolution test. This value has a great relationship with lens quality, and the lower the value, the better.

The test results show that the imaging of Longteng SP DIAF 90 mm 1: 2.8 macro 1: 1 has obvious dispersion in the edge area of the picture, but the absolute value is not large.

When testing the shape distortion of imaging, we use the test prototype to shoot the square on the plane, and then use Imatest to test the distortion of imaging. The values in the list are SMIA TV distortion, and the closer to zero, the better. A positive value indicates that the imaging produces pincushion distortion, while a negative value is the opposite.

Image shape distortion test results of spdiaf 90mm1:2.8macro1:1.

EF 100mm 1:2.8 USM imaging shape distortion test results

According to the test values, the imaging shapes of Longteng SPDIAF 90 mm1:2.8 macro1:Canon EF 100mm 1:2.8 USM are not obviously distorted, while Longteng SPDIAF 90 mm1:2.8.

We use the wide-angle end of the test prototype to shoot an unfocused white object with uniform illumination, and then use software to test the loss of brightness, and get the ratio of the brightness of the corners to the highest brightness of the imaging center. This value can show the light loss at the corner of the lens and reflect the uniformity of the lens. Below 100%, the bigger the better.

Longteng spdiaf 90mm1:2.8macro1:1full aperture extinction test results.

The test results show that the edge brightness of the two images decreases slightly when the aperture is fully open, and the images are slightly dark, but not obvious, which is difficult to find when shooting general objects.

When analyzing the imaging chromatic aberration of the two lenses, we use the test prototype to fix the color temperature setting, shoot the X-rite ColorChecker SG color test target with ISO 100 sensitivity, and then analyze the color to get the imaging color error data. In the color error diagram, the squares in the Lab color gamut coordinates represent the ideal color (standard color) of the subject, and the circles represent the imaging color of the camera under test.

Color test results of Longteng spdiaf 90mm1:2.8macro1:1.

Color test results of Canon EF 100mm 1:2.8 USM

According to the color test results, SPDIAF 90 mm1:2.8 macro1:1does not bring obvious color tendency compared with the original lens.

If complete presentation is the ultimate pursuit of macro photography, then the changing image of reality and reality is the aesthetic way of macro photography. We found that Longteng spdiaf 90mm1:2.8macro1:1is excellent in softening Jiao Wai objects, but it is not easy to take very sharp photos with a high pixel model like EOS 5D Mark II. The following are some test samples of Longteng spdiaf 90mm1:2.8macro1:1,which were converted from RAW files without sharpening, and finally stored as JPG with the largest size and highest quality:

If complete presentation is the ultimate pursuit of macro photography, then the changing image of reality and reality is the aesthetic way of macro photography. We found that Longteng SPDIAF 90mm1:2.8macro1:1is excellent in softening Jiao Wai objects, but it is not easy to take a very sharp picture with a high pixel model like EOS 5D Mark II. The following are some test samples of Longteng spdiaf 90mm1:2.8macro1:1,which were converted from RAW files without sharpening, and finally stored as JPG with the largest size and highest quality:

"IT 168 assessment center view:

With the trend of more and more high-pixel models, we have almost strict requirements for the imaging clarity of the lens. Through testing on EOS 5D Mark II and other high-pixel models, we found that Longteng SPDIAF 90 mm1:2.8 macro1still has some shortcomings in performance compared with Canon's original 100 micron lens, mainly in the definition of imaging under large aperture. Of course, the quieter focusing state brought by Canon USM is also a big advantage of the original lens.

Longteng spdiaf 90mm1:2.8macro1:1lens is installed on Canon EOS 5D Mark II (click here to view larger image.

)

Considering the purchase cost, Longteng SPDIAF 90 mm1:2.8 macro1:1lens is still very attractive. Its large aperture of f/2.8 and image magnification of 1 make it widely used. Its soft Jiao Wai image effect is very suitable for some macro-themed photography creation. In addition, the focus switching mechanism and focus range split switch of Longteng SPDIAF 90 mm1:2.8 macro1lens bring more efficient and comfortable shooting experience, which is even the highlight beyond the original lens.

Canon EF 100mm 1:2.8 USM

Canon EF/KOOC-0/00 mm/KOOC-0/:2.8 USM is an ideal choice for some very precise scientific research and recording needs, but if it is only for creating some macro art photos, then Longteng SPDIAF 90 mm/KOOC-0/:2.8 macro/KOOC-0/is the general movie lover. Of course, considering the performance of all aspects, we should still put this issue. Budweiser champion? The title was awarded to Canon's EF 100mm 1:2.8 USM lens.

"Disclaimer: The evaluation content of this article is based on the samples provided by Longteng Company (product number: 00 143 1). Our evaluation conclusion is only responsible for the individual who sent the samples for testing, and there is no guarantee that this individual can represent the overall level of products on the market.