主题：24-70GM 和 24-70 2.8ZA + LA-EA3 能相差多少
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qumiq3 发表于 2018-4-20 18:24
E口的cmos边角的微透镜设计成倾斜的，针对原生GM头设计，你用A口转接的，入射角跟cmos微透镜的不匹配了。
不错，也能解释8楼的说法，同时24-70ZA2.8只在色彩上有优势也可以解释。
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以下是国外著名镜头评论 - PHOTOZONE 的评价。
Verdict - Zeiss Vario-Sonnar T* 24-70mm f/2.8 ZA SSM 一代 - 得分3 ~3.5星
http://www_opticallimits_com/sonyalphaff/600-zeiss2470f28ff?start=1
The Zeiss Vario-Sonnar T* 24-70mm f/2.8 ZA SSM produced outstanding performance figures in our APS-C test but it's not quite as good when used within its native full format scope. It is, of course, still able of delivering an outstanding center resolution but the corner quality disappoints at 24mm when using large to medium aperture settings. You may argue that the quality is fine at mainstream settings here (f/8-f/11) but for this amount of money you simply expect better results here. The lens is certainly very sharp at 40mm and still pretty good at 70mm. Lateral CAs may be visible at times in wide-angle images but it's a non-issue in the middle to upper zoom range. A rather disappointing aspect of the lens is the quality of the bokeh (character of the out-of-focus blur) which could be better @ 70mm f/2.8 - this may cause headaches for some users. Bokeh fringing is very well controlled though. The lens is somewhat prone to flare.
The build quality of the Zeiss is very good although we expected a tad less plastic and some sort of sealing in a lens targeting the professional market. A highlight of the lens is the extremely fast and silent SSM AF drive - if you think the Canon or Nikkor variants are fast here you may need to prepare yourself for a surprise. The Sonnar is an expensive lens but despite its shortcomings you'll probably have a hard time to find anything better for a full format Sony Alpha DSLR (the Sony 28-75mm f/2.8 seems worse based on our preliminary tests).
Verdict - 24-70mm f/2.8 GM - 得分3星
http://www_opticallimits_com/sonyalphaff/997-sony2470f28gm?start=1
Sony's marketing made some pretty aggressive statements at the time of the announcement of their new GM lineup. The Sony FE 24-70mm f/2.8 GM is the first GM lens that we tested here and while we are impressed by the quality, it didn't really blow off our socks either. Now please note again that lens was tested on a 42 megapixel sensor. This is challenging. e.g. Our full format Canon tests are now based on 50 megapixels and some of you may have noticed that many lenses struggle here as well. So keeping this in mind, the Sony FE 24-70mm f/2.8 GM is actually a very good lens indeed. The center quality is just great. The borders/corners may struggle a bit at f/2.8 (except at 35mm) but if you stop down the resulting image is sharp across the image field. Lateral CAs are a bit high at the wide-end. The vignetting characteristic is typical for a lens in this class - thus there's a high light falloff at f/2.8, especially at 24mm. As usual stopping down helps. Image distortions can be visible in critical scenes at the extreme ends of the zoom range. Activating image auto-correction will fix most of these secondary issues though.
If there is a single aspect that disappointed us it's the bokeh. Or to be precise - the difference between Sony's claim and reality. Generally, the bokeh is good for a standard zoom lens ... that is except for the rendition of highlight discs. Sony made quite a fuzz around clean highlight discs but the truth remains that they can be rather rough and they aren't any better than what we've seen from Canon or Nikon really.
The build quality of the Sony FE 24-70mm f/2.8 GM is extremely high. The materials are top notch and the weather/dust sealing is the cream on the cappuccino here. However, at that price point, we expected no less and the competition is, again, no worse either. Anyway, if you want the best standard zoom lens in Sony E mount, this is certainly it. The Zeiss FE 24-70mm f/4 OSS is inferior at comparable aperture settings. A more difficult question may be whether such a big and heavy lens can make sense on a rather tiny mirrorless camera body. Now we have to admit that the balance of the setup is surprisingly good. However, we also thought that the combo is a little odd nonetheless.
PHOTOZONE 的评价，对一代的24-70mm f/2.8 ZA已经很高，甚至比GM 还高。其实两个头叮当马头，半斤八两。只看你如何看事。
GM头测试数字优异，是客观事实。但实拍又是另一回事。问题是我们真的经常需要大光圈拍摄吗？
拍摄风景，在光线良好情况下，通常用较小光圈拍摄，变形，色散，紫边和暗角根本不会严重。另外，这些缺陷都很容易用后期软件矫正。但蔡司的色彩和暗位层次（T*镀膜技术小日本还没有学到手！），却是日系头无法模拟的，无法后期矫正。
GM头的优势是相对较轻，虚化较好，画面柔和，适宜拍摄结婚照和人像。蔡司头则颜色，反差，暗位层次优异，用料正（全金属较耐用），适合拍摄风景，扫街，日常生活。各有所长！如何选择就看大师的实际需要！
温馨提醒：-
1）数字是最容易欺骗人的利器。而日本人最懂得此道。如果单看数字，莱卡头可能比很多L头，G头及金圈头都不如，但无损莱卡的江湖地位。
2）很多测试评分主要针对解析度、锐度、反差，并没有考虑色彩表现，暗位层次，透明感，立体感及空气感等比较主观的项目。避免因过于主观而遭制造商责难，引起不必要的官司而赔款。
但这种做法，犹如电脑选美，只考虑五官端正，三围，身高，体重，学历等客观数据，但毫不考虑气质，漂亮，魅力，才华等更重要的因素，这样的标准能得出使人满意的结果吗？由此便应该知道网上的测试报告，不可全信。
最理性的做法是上Flickr 照片库，看看自己属意那个头。
https://www.flickr.com/search/?text=SAL-2470ZA&media=photos&dimension_search_mode=min&height=1024&width=1024
Verdict - Zeiss Vario-Sonnar T* 24-70mm f/2.8 ZA SSM 一代 - 得分3 ~3.5星
http://www_opticallimits_com/sonyalphaff/600-zeiss2470f28ff?start=1
The Zeiss Vario-Sonnar T* 24-70mm f/2.8 ZA SSM produced outstanding performance figures in our APS-C test but it's not quite as good when used within its native full format scope. It is, of course, still able of delivering an outstanding center resolution but the corner quality disappoints at 24mm when using large to medium aperture settings. You may argue that the quality is fine at mainstream settings here (f/8-f/11) but for this amount of money you simply expect better results here. The lens is certainly very sharp at 40mm and still pretty good at 70mm. Lateral CAs may be visible at times in wide-angle images but it's a non-issue in the middle to upper zoom range. A rather disappointing aspect of the lens is the quality of the bokeh (character of the out-of-focus blur) which could be better @ 70mm f/2.8 - this may cause headaches for some users. Bokeh fringing is very well controlled though. The lens is somewhat prone to flare.
The build quality of the Zeiss is very good although we expected a tad less plastic and some sort of sealing in a lens targeting the professional market. A highlight of the lens is the extremely fast and silent SSM AF drive - if you think the Canon or Nikkor variants are fast here you may need to prepare yourself for a surprise. The Sonnar is an expensive lens but despite its shortcomings you'll probably have a hard time to find anything better for a full format Sony Alpha DSLR (the Sony 28-75mm f/2.8 seems worse based on our preliminary tests).
Verdict - 24-70mm f/2.8 GM - 得分3星
http://www_opticallimits_com/sonyalphaff/997-sony2470f28gm?start=1
Sony's marketing made some pretty aggressive statements at the time of the announcement of their new GM lineup. The Sony FE 24-70mm f/2.8 GM is the first GM lens that we tested here and while we are impressed by the quality, it didn't really blow off our socks either. Now please note again that lens was tested on a 42 megapixel sensor. This is challenging. e.g. Our full format Canon tests are now based on 50 megapixels and some of you may have noticed that many lenses struggle here as well. So keeping this in mind, the Sony FE 24-70mm f/2.8 GM is actually a very good lens indeed. The center quality is just great. The borders/corners may struggle a bit at f/2.8 (except at 35mm) but if you stop down the resulting image is sharp across the image field. Lateral CAs are a bit high at the wide-end. The vignetting characteristic is typical for a lens in this class - thus there's a high light falloff at f/2.8, especially at 24mm. As usual stopping down helps. Image distortions can be visible in critical scenes at the extreme ends of the zoom range. Activating image auto-correction will fix most of these secondary issues though.
If there is a single aspect that disappointed us it's the bokeh. Or to be precise - the difference between Sony's claim and reality. Generally, the bokeh is good for a standard zoom lens ... that is except for the rendition of highlight discs. Sony made quite a fuzz around clean highlight discs but the truth remains that they can be rather rough and they aren't any better than what we've seen from Canon or Nikon really.
The build quality of the Sony FE 24-70mm f/2.8 GM is extremely high. The materials are top notch and the weather/dust sealing is the cream on the cappuccino here. However, at that price point, we expected no less and the competition is, again, no worse either. Anyway, if you want the best standard zoom lens in Sony E mount, this is certainly it. The Zeiss FE 24-70mm f/4 OSS is inferior at comparable aperture settings. A more difficult question may be whether such a big and heavy lens can make sense on a rather tiny mirrorless camera body. Now we have to admit that the balance of the setup is surprisingly good. However, we also thought that the combo is a little odd nonetheless.
PHOTOZONE 的评价，对一代的24-70mm f/2.8 ZA已经很高，甚至比GM 还高。其实两个头叮当马头，半斤八两。只看你如何看事。
GM头测试数字优异，是客观事实。但实拍又是另一回事。问题是我们真的经常需要大光圈拍摄吗？
拍摄风景，在光线良好情况下，通常用较小光圈拍摄，变形，色散，紫边和暗角根本不会严重。另外，这些缺陷都很容易用后期软件矫正。但蔡司的色彩和暗位层次（T*镀膜技术小日本还没有学到手！），却是日系头无法模拟的，无法后期矫正。
GM头的优势是相对较轻，虚化较好，画面柔和，适宜拍摄结婚照和人像。蔡司头则颜色，反差，暗位层次优异，用料正（全金属较耐用），适合拍摄风景，扫街，日常生活。各有所长！如何选择就看大师的实际需要！
温馨提醒：-
1）数字是最容易欺骗人的利器。而日本人最懂得此道。如果单看数字，莱卡头可能比很多L头，G头及金圈头都不如，但无损莱卡的江湖地位。
2）很多测试评分主要针对解析度、锐度、反差，并没有考虑色彩表现，暗位层次，透明感，立体感及空气感等比较主观的项目。避免因过于主观而遭制造商责难，引起不必要的官司而赔款。
但这种做法，犹如电脑选美，只考虑五官端正，三围，身高，体重，学历等客观数据，但毫不考虑气质，漂亮，魅力，才华等更重要的因素，这样的标准能得出使人满意的结果吗？由此便应该知道网上的测试报告，不可全信。
最理性的做法是上Flickr 照片库，看看自己属意那个头。
https://www.flickr.com/search/?text=SAL-2470ZA&media=photos&dimension_search_mode=min&height=1024&width=1024
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龙行自由天下 发表于 2018-4-20 17:35
论综合光学性能及Bokeh，GM 头稍微占优。论色彩，暗位层次，蔡司24-70mm F2.8 ZA SSM II 赢足一条街。。。看你要求锐度还是色彩。。。拍摄人像是GM好，风景则首选蔡司。
看到你这个资料，我心里得到了安慰，
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Solomage 发表于 2018-4-20 13:47
为啥单反头在广角端会有边角损失？照理说为长法兰距设计的单反头应该入射光线更直才对。为短法兰距设计的微单镜头或者旁轴镜头才会有边角损失。
E口的cmos边角的微透镜设计成倾斜的，针对原生GM头设计，你用A口转接的，入射角跟cmos微透镜的不匹配了。
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Solomage 发表于 2018-4-20 13:47
为啥单反头在广角端会有边角损失？照理说为长法兰距设计的单反头应该入射光线更直才对。为短法兰距设计的微单镜头或者旁轴镜头才会有边角损失。
因为开口直径a口比e口要大一点，边角光线虽然e口的传感器使用了像素倾斜，但是效果不知道了，转接就是如此，佳能的单反开口是几家最大的，转接16-35，在广角端边角明显画质下降。
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ppchris 发表于 2018-4-20 00:57
单反头在广角端有边角画质损失，gm就是针对e口研发，所以最好gm
为啥单反头在广角端会有边角损失？照理说为长法兰距设计的单反头应该入射光线更直才对。为短法兰距设计的微单镜头或者旁轴镜头才会有边角损失。
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ppchris 发表于 2018-4-20 00:57
单反头在广角端有边角画质损失，gm就是针对e口研发，所以最好gm
可能这也是扩大口径的原因。。。但是没在网上找到对比。哪天我自己租个2470GM对比试一下。
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回复主题： 24-70GM 和 24-70 2.8ZA + LA-EA3 能相差多少
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