external network evaluation: Tamron "18-300mm F / 3.5-6.3 Di III-A VC VX D" lens achieves a high magnification zoom rate while having considerable high resolution.
Tamron has recently released 3 lenses, 2 of which are full-frame lenses, and this one is a half-frame lens. The first impression of this lens is that it is very large compared to the APS-C lens. The quality of the lens barrel is the same as other Tamron lenses. The diameter of the filter is also maintained at 67 mm.
1. This lens stretches greatly when zooming. If you hang the camera around your neck, the zoom will slowly expand due to its own weight, so it has a zoom lock switch.
2. The zoom ring is heavy and it is difficult to zoom smoothly.
3. Autofocus is fast, accurate and quiet. At the telephoto end (200-300mm), if the light conditions are bad, the lens will darken and AF will hesitate a bit. Eye autofocus and moving object tracking autofocus work well.
4. In the resolution test, 18-100mm is a surprising result from very good to excellent. In the range of 200 to 300 mm, the performance drops by one level, but when the aperture is reduced by one level, very good resolution can still be obtained. In such a high zoom lens, such resolution performance is very good.
The chart above is the qualitative result of testing each focal length of this lens. light blue represents a very good resolution , green represents a very good resolution , light green represents a good resolution , yellow represents a general resolution,
test the lens The center resolution (Centre) and edge resolution (Corners) were tested at each important focal length.
can be seen in the table of test results.The performance of the lens at 18-100mm focal length is very good. After shrinking the aperture by one stop, the center resolution will reach the excellent standard of . Edge performance is also very good in resolution standard .
In the 200-300 focal length range, the resolution will drop by one level, that is, after the resolution of the center part is reduced by one stop, it can reach the very good standard of , and the edge part can reach the good standard of .
In the telephoto part of 200-300, only the F8 aperture is reached to a very good level. As the aperture continues to shrink, the resolution is further reduced due to optical diffraction.
5. The skin tone reproduction in the portrait is excellent,
6. The distortion of the lens performance
distortion at 18mm is more obvious barrel distortion. If shooting a scene composed of buildings and straight lines, it needs to be corrected in the camera or later. When the lens zooms to the telephoto end, the distortion becomes pincushion distortion. JPEG direct output can set automatic distortion correction in the camera, but there is no Ligthroom lens configuration file in the RAW file. According to previous examples, it may take six months to one year for the software to have the correction function.
7. Vignetting performance
Because this lens has a large zoom ratio, the peripheral light attenuation is obvious, and it needs to be reduced by 2 stops to eliminate it.
8. Chromatic aberration
The chromatic aberration is very small because it belongs to a lens with a small aperture.
9. Backlight performance
When the sun enters the screen, you will see some halos, and the performance of anti-backlight is average.
10. Bokeh
From on to F8, the spherical bokeh almost remains circular, which is a good performance for the 7-blade aperture. The back bokeh of the high-power zoom is very soft,Although it is a small-aperture lens, a considerable bokeh can be obtained close to the shortest point.
11. Color reproduction
The color performance of this lens is very natural and very good.
12. Video shooting performance
The overall performance of video shooting is very good, and the color reproduction is also very good, but the zoom ring is very hard and it is not ideal when used. Smooth zoom cannot be achieved, so you should use a fixed focal length to shoot when shooting video. Video autofocus performs very well below 150mm, but it is easy to pull the bellows at 150-300mm. The breathing effect of the lens is good, and the breathing is very low.
Compared with similar lenses, it performs much better than the old Tamron 18-200mm F3.5-6.3 Di III VC and Sony E18-200mm F3.5-6.3 OSS. The performance is close to E18-135mm F3.5-5.6 OSS, the zoom range is narrow, but the telephoto end is not as good as E70-350mm F4.5-6.3 G OSS.
Bokeh is better than the 18-200mm of Sony and Tamron. Distortion, vignetting and anti-backlight performance are not much different from other high-power zooms.
Considering the image quality and high-speed autofocus, Tamron 18-300mm F/3.5-6.3 is far better than all other 18-200mm zooms, but if you mainly use 100-300mm focal length, Sony E70-350mm F4.5-6.3 G OSS is obviously a better choice.
Tamron 18-300mm F / 3.5-6.3 Di III-A VC VXD is big and heavy, but sharp, with good color and smooth back view. It is far superior to many other 18-200mm and E55-210mm F4.5-6.3, and should be the best E-mount all-in-one zoom.
Tamron’s 18-300mm F/3.5-6.3 has a large zoom range, but its resolution is very high, which is a huge improvement over previous high-magnification zoom lenses. The telephoto end is soft, but it still has enough practical performance.
The pictures and texts in this article are abstracts and translations based on external data.
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