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Here"s a brief look at the Tamron 17-50mm F/2.8 XR Di II zoom lens. Scroll down for the main review.
APS-C only, with a 35mm equivalent of 26-75mm. Works on full frame camera, but vignettes hard at all focal lengths. Use APS-C size capt. For correct pictures on Sony FF cameras.
The Sony A700 was used for this review. For a better understanding of terms và methods used in this review, go here.
The Tamron 17-50mm F/2.8 is a fast, medium length zoom lens that covers about the same area as the standard issue "kit" lenses from various manufacturers. It has a large constant aperture of F/2.8 & is built reasonably well. It"s also similar in design and performance khổng lồ the Sigma 18-50mm F/2.8 lens reviewed here. This lens, like the Sigma, has been designed for exclusive use on APS-C cameras. The 35mm equivalent focal length is a pretty handy 26mm-75mm. Kiểm tra out the excellent Sony DT 16-50mm F/2.8 SSM also reviewed here.
The made in nhật bản Tamron 17-50mm F/2.8 appears lớn be made mostly of plastic around the barrel, but metal has been used for the mount. There"s a nice wide rubber grip area around the zoom ring, reminiscent of Konica Minolta. Fit & finish are good, with smooth actions for zooming and focus. I didn"t notice any zoom creep during my limited use, but should you encounter that problem, there"s a zoom lock button to keep the zoom locked at the 17mm length only, it can"t be set at any other length. You can tell you have the zoom lock mix as it shows red on the slide khổng lồ let you know, see hàng hóa shot above. Zooming adds just over 1" (29mm) of length lớn the lens. Additionally, the EXIF data is correct at all focal length index marks.
In the box comes the lens, a petal-type plastic hood, an owner"s manual in several languages, & front and rear caps.
This lens has an internal focus design, so there is no additional extension of the lens. The focusing ring has a rubber insert for easy gripping, và the ring rotates when using AF, so watch your fingers. Auto-focusing tốc độ is average khổng lồ slow, but appears mostly accurate in my limited use. I noticed it wants to roll all the way over past the infinity index mark when focusing to infinity near the wide end, fortunately, that seems khổng lồ be the sharpest position. I think the index mark might be off or possibly the calibration, but again, it"s nice and sharp at that setting. At the long end, AF goes to the infinity index mark when focused at infinity, and is good & sharp there. When focusing manually, you only need about 1/6 of a turn, which is pretty fast, và doesn"t allow any attempt at fine tuning, especially for people with jittery hands. Also note this lens has a reversed focus direction as compared to lớn most of Sony"s lenses, meaning the focus ring turns clockwise to lớn go lớn infinity, as you are holding the camera properly.
Internally, Tamron boasts of "XR" or extra refractive index glass; at least one aspherical element, & "LD" glass, no specifics are given. The lens is multi-coated, and shows green/magenta, with emphasis on green.
Lens flare/ghosting. Average khổng lồ above average control for a wide-angle zoom. I see mostly green colored ghosts if the sun is at the edge, or inside the image. The ghosts change shape and màu sắc with focal length & aperture. Look below for examples. Veiling glare control seems average lớn above average as you zoom out, though as always, use your hand khổng lồ block the sun or other super-bright light source with your hand lớn keep the contrast up in your shots, if the sun isn"t actually in the shot.
Color fringing (CA). Above average control. Look for mild amounts of lateral color fringing at và near 17mm, diminishing to almost nothing at 50mm. Moderate amounts of lateral màu sắc fringing can be seen at close focus, but that"s fairly normal. I see no axial color fringing at any aperture.
Bokeh. Harsh at all focal lengths, similar to lớn the Sigma 18-50mm F/2.8 và the kit zoom lenses. Look below for sample crops.
Here"s a brief look at the Tamron 17-50mm F/2.8 XR Di II zoom lens. Scroll down for the main review.
Bạn đang xem: Đánh giá tamron 17-50
APS-C only, with a 35mm equivalent of 26-75mm. Works on full frame camera, but vignettes hard at all focal lengths. Use APS-C size capt. For correct pictures on Sony FF cameras.
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| Box và contents |
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| Side shot fully drawn in, with zoom lock engaged |
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| Side shot fully extended |
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| Backside mount. |
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| Front element |
The Sony A700 was used for this review. For a better understanding of terms và methods used in this review, go here.
Xem thêm: Chủ Đề: Đọc Truyện Gì Bây Giờ ? Chủ Đề: Đọc Truyện Gì Bây Giờ
The Tamron 17-50mm F/2.8 is a fast, medium length zoom lens that covers about the same area as the standard issue "kit" lenses from various manufacturers. It has a large constant aperture of F/2.8 & is built reasonably well. It"s also similar in design and performance khổng lồ the Sigma 18-50mm F/2.8 lens reviewed here. This lens, like the Sigma, has been designed for exclusive use on APS-C cameras. The 35mm equivalent focal length is a pretty handy 26mm-75mm. Kiểm tra out the excellent Sony DT 16-50mm F/2.8 SSM also reviewed here.
The made in nhật bản Tamron 17-50mm F/2.8 appears lớn be made mostly of plastic around the barrel, but metal has been used for the mount. There"s a nice wide rubber grip area around the zoom ring, reminiscent of Konica Minolta. Fit & finish are good, with smooth actions for zooming and focus. I didn"t notice any zoom creep during my limited use, but should you encounter that problem, there"s a zoom lock button to keep the zoom locked at the 17mm length only, it can"t be set at any other length. You can tell you have the zoom lock mix as it shows red on the slide khổng lồ let you know, see hàng hóa shot above. Zooming adds just over 1" (29mm) of length lớn the lens. Additionally, the EXIF data is correct at all focal length index marks.
In the box comes the lens, a petal-type plastic hood, an owner"s manual in several languages, & front and rear caps.
This lens has an internal focus design, so there is no additional extension of the lens. The focusing ring has a rubber insert for easy gripping, và the ring rotates when using AF, so watch your fingers. Auto-focusing tốc độ is average khổng lồ slow, but appears mostly accurate in my limited use. I noticed it wants to roll all the way over past the infinity index mark when focusing to infinity near the wide end, fortunately, that seems khổng lồ be the sharpest position. I think the index mark might be off or possibly the calibration, but again, it"s nice and sharp at that setting. At the long end, AF goes to the infinity index mark when focused at infinity, and is good & sharp there. When focusing manually, you only need about 1/6 of a turn, which is pretty fast, và doesn"t allow any attempt at fine tuning, especially for people with jittery hands. Also note this lens has a reversed focus direction as compared to lớn most of Sony"s lenses, meaning the focus ring turns clockwise to lớn go lớn infinity, as you are holding the camera properly.
Internally, Tamron boasts of "XR" or extra refractive index glass; at least one aspherical element, & "LD" glass, no specifics are given. The lens is multi-coated, and shows green/magenta, with emphasis on green.
Lens flare/ghosting. Average khổng lồ above average control for a wide-angle zoom. I see mostly green colored ghosts if the sun is at the edge, or inside the image. The ghosts change shape and màu sắc with focal length & aperture. Look below for examples. Veiling glare control seems average lớn above average as you zoom out, though as always, use your hand khổng lồ block the sun or other super-bright light source with your hand lớn keep the contrast up in your shots, if the sun isn"t actually in the shot.
Color fringing (CA). Above average control. Look for mild amounts of lateral color fringing at và near 17mm, diminishing to almost nothing at 50mm. Moderate amounts of lateral màu sắc fringing can be seen at close focus, but that"s fairly normal. I see no axial color fringing at any aperture.
Bokeh. Harsh at all focal lengths, similar to lớn the Sigma 18-50mm F/2.8 và the kit zoom lenses. Look below for sample crops.
