12/12/2017 4:36Phản hồi: 2
Mình đang dùng máy Nikon D5200 + lens 35mm 1.8G. Nhu cầu chụp ảnh gia đình, du lịch. Rất ưng chất ảnh và độ nét của em lens này. Tuy nhiên đi du lịch chụp phong cảnh lại hơn bị bó tay bó chân nên muốn đổi qua 1 em lens tiện dụng như Sigma 17-50mm 2.8. Vậy nhờ các anh em so sánh dùm chất ảnh 2 em này xem có nên đổi không.
Về chất ảnh thì quan trọng nhất là độ nét. Mấy cái như quang sai hay biến dạng có thể chỉnh được tương đối nhờ lightroom. Do 35 1.8G là len một tiêu cự nên độ sắc nét tốt hơn Sigma 17-50, chưa kể tới việc khẩu lớn sẽ giúp chụp tối và bắt nét tốt hơn. À, quên nói với bác Nikon có 2 loại len 35 1.8, len có dòng chữ DX là len cho crop có độ sắc nét kém hơn nhiều so với len 35 1.8 loại dành cho fullframe [chênh nhau hơn 7tr]. Riêng so con 35 1.8 DX với Simga 17-50 thì cực kì đáng đổi vì còn len DX này độ nét còn kém cả Sigma.
@giangcj Cám ơn bác. Em đang dùng con DX ạ
....với người dùng máy ảnh dSLR dòng DX entry như D40/D40x/D60 [Nikon đã loại bỏ motor lấy nét trong body], việc chọn lựa 1 ống kính prime tốt là khá khó khăn và hạn chế…vì hầu hết các ống fix AF-S đều rất đắt, ngoài tầm với [gấp 2,3 thậm chí chục lần body] như ống AF-S 105mm macro VR [~750$] ; AF-S 200mm f/2 [~4600$]....và mới đây là AF-S 50mm f/1.4G [~500$], và hầu như giải pháp duy nhất để “sống chung với lũ” là tậu các ống cho FF như 35 f/2D , 50 f/1.8D, 85 f/1.8D…xài đỡ và chỉnh nét bằng tay khá là mệt…:crying: [MF]
...Và các Nikonian giờ đây có thể sung sướng với sự ra đời của AF-S DX Nikkor 35mm f1.8G ... đây là prime lens dòng AF-S có khẩu độ lớn, được Nikon thiết kế riêng cho dòng máy DX [chứng tỏ dòng DX sẽ vẫn còn được hãng support dài dài...yeah :beer_smile😃 ... lại nhỏ nhẹ [chỉ 210g] và điều quan trọng nhất là giá rất dễ chịu ~199.95$ ...[chưa tax, ship] :11:
Spec của ống:
Tiêu cự - 35 mm Độ mở lớn nhất - f/1.8 Độ mở nhỏ nhất - f/22 Góc nhìn - 44° Cấu trúc ống - 8 thấu kính chia làm 6 nhóm Khoảng cách AF gần nhất - 30 cm Độ phóng đại tối đa - 0.16x Số lá khẩu - 7
The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes.
A metal mount is generally superior to a plastic mount as it is more durable.
We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.
The front element doesn’t rotate. This is important if you use filters, as some such as polarising or gradient filters have to be orientated a certain way.
It comes with a lens hood so that you don’t have to buy it separately. These are used to block strong light sources, such as the sun, from the lens to prevent glare and lens flare.
The lens hood can screw onto the lens in reverse so that you can keep it on your camera at all times, ready to use.
filter size
Unknown. Help us by suggesting a value. [Nikon AF-S Nikkor 35mm F/1.8G ED]
This measurement is important to take into account when buying filters.
Optics
A longer maximum focal length allows you to focus in on a small part of a scene, and offers a narrower angle of view than shorter focal lengths.
A shorter minimum focal length allows you to get more of the scene in the photo, and offers a wider angle of view than longer focal lengths.
Optical image stabilization uses gyroscopic sensors to detect the vibrations of the camera. The lens adjusts the optical path accordingly, ensuring that any type of motion blur is corrected before the sensor captures the image.
At the shorter end of the lens you get the widest angle of view. This allows you to fit more of the scene into the photograph [based on APS-C format].
At the longest end of the lens you get the narrowest angle of view. This allows you to fit a small portion of the scene into the photograph, such as when you are zooming in on a subject [based on APS-C format].
A true macro lens has a magnification of 1:1. This means that the image produced is a life-size representation of the subject being photographed.
The zoom range is the ratio between the longest and shortest focal lengths. A higher zoom range means that the lens is more versatile.
Aperture
With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
Similar to the number of aperture blades, rounded blades affect the way the light gets through to the sensor. Rounded blades, often only found on more expensive lenses, improve the appearance of the out-of-focus areas. This allows you to attain better, softer looking bokeh in your photos.
The aperture controls how much light gets through to the camera’s sensor. More blades is often an indicator of a better quality lens. It also allows you to achieve much nicer looking bokeh when blurring out your background, whereas a lens with less blades will often produce harsher, more polygonal bokeh.
A smaller aperture reduces the amount of light reaching the sensor. This is important in bright conditions where a wider aperture could result in your image being overexposed. Another advantage is that with a smaller aperture you get a greater depth of field, and can keep all of the image in focus.
A smaller aperture reduces the amount of light reaching the sensor. This is important in bright conditions where a wider aperture could result in your image being overexposed. Another advantage is that with a smaller aperture you get a greater depth of field, and can keep all of the image in focus.
Focus
Many lenses allow you to focus to infinity. This is essential when you wish to take photos including far off objects, such as when shooting landscapes, in order to make sure everything is sharp and in focus.
Has focus motor
✔Nikon AF-S Nikkor 35mm F/1.8G ED
✔Nikon AF-S Nikkor 50mm F/1.8G
Lenses with a built-in focus motor can autofocus even if the camera does not have its own focus motor.
With full-time manual focus, you can move the focus ring whilst it is in AF [autofocus] mode. This means that you can make manual adjustments once the AF has finished, without changing to manual mode.
Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor.
This is the closest distance that the lens can focus. A shorter minimum focus distance allows you to get closer to your subject, and is particularly important when doing macro photography.
Benchmarks
The sharpness result from the DxOMark set of metrics. This result is based on the MTF [modulation transfer function] measurement, and gives an overall indication of the sharpness of images produced by the lens.
The lateral chromatic aberration result from the DxOMark set of metrics. Chromatic aberration is a type of distortion which results in color fringing along edges within the image.
DxOMark is a set of tests to measure the performance and quality of lenses and cameras. The DxOMark score is the overall score given to the lens.
The distortion result from the DxOMark set of metrics. Distortion in the lens refers to the variation of magnification throughout the image. More distortion will result in straight lines being recorded incorrectly in the image.
The transmission result from the DxOMark set of metrics. Transmission refers to the amount of light that reaches the sensor through all of the glass elements of a lens, with a lower TStop signifying more light. This is important as less light reaching the sensor can lead to the requirement of higher ISOs or slower shutter speeds.
The vignetting result from the DxOMark set of metrics. Vignetting refers to when the brightness of an image changes from the center towards the edges, resulting in darkened corners. A result of 0 is perfect and the image will have no vignetting.