单反有2种意思

单反有2种意思 单反有2种意思。在光学上单反就是指单镜头反光,即SLR(single lens reflex)，单镜头反光数码相机，即Digital数码、Single单独、Lens镜头、Reflex反光的英文缩写DSLR。它能使观景窗中所看到的影像和胶片上永远一样，它的取景范围和实际拍摄范围基本上一致，消除了旁轴平视取景照相机的视差现象。在体育上是指网球反手技术之一，网球反手技术有单手反拍(简称“单反”)与双手反拍(简称“双反”)单反优雅，双反稳定。 简介 单反就是指单透镜反光,即SLR(single lens reflex)，是当今最流行的取景系统。 在这种系统中，反光镜和棱镜的独到使得摄影者可以从取景器中直接观察到通过镜头的影像。单透镜反光照相机的构造图中可以看到，光线透过镜头到达反光镜后，折射到上面的对焦屏并结成影像，透过接目镜和五棱镜，我们可以在观景窗中看到外面的景物。拍摄时，当按下快门钮，反光镜便会往上弹起，软片前面的快门幕帘便同时打开，通过镜头的光线(影像)便投影到软片上使胶片感光，尔后反光镜便立即恢复原状，观景窗中再次可以看到影像。单镜头反光相机的这种构造，确定了它是完全透过镜头对焦拍摄的，它能使观景窗中所看到的影像和胶片上永远一样，它的取景范围和实际拍摄范围基本上一致，消除了旁轴平视取景照相机的视差现象，从学习摄影的角度来看，十分有利于直观地取景构图。 不存在视差 单反机由于整个成像系统(对焦与拍摄)为一个镜头所以不存在视差也就是说取景和成像是一致的。(传统机子多为旁轴式取景) 其次由于采用一个成像系统为一个镜头所以协调反应比一般的机子反应快，所以单反机对高速运动的物体拍摄较好(不会因为相机反应迟钝错失佳景) 再次，单反机由于采用了换镜头组成不同的摄影系统比如说你可以换广角镜、可以加长镜头、也可以加色片、还可以选用微距离镜头等等来满足你的不同需求。你不会因为机子镜头受限错失美景。 优秀的镜头 最后一点，由于单反机多采用了纯天然的水晶或萤石打磨的镜头所以价格就比一般的玻璃以及塑料镜头贵多了。甚至有些采用了超声波马达调节镜头比机械式震动更小有些还有自己的防抖专利(如佳能的EF系列镜头中带有IS标志的)特别是佳能EF系列镜头中带红线的就是所谓的纯天然萤石镜头贵的一个镜头在3-5万之间。 优势及常见品牌 单反数码相机就是指单镜头反光数码相机，即Digital数码、Single单独、Lens镜头、 Reflex反光的英文缩写DSLR。市场中的代机型常见于尼康、索尼、佳能、宾得、富士等。此类相机一般体积较大，比较重。 quality egg, chicken, ... Development of poultry industry will occupy a certain area of land, there is a modern product with comprehensive rollup of 50,000 chickens laying hens, covers an area of 14.87 hectares (233 acres) more (including Office of hatching, brood rearing, and laying House, eggs, feed processing workshop, Office, etc). The poultry industry should work in land conservation, not accounted for or less cultivated land, wasteland, the principle of slope land. When the chicken farm should generally not available to local arable land area to determine an appropriate level of breeding size and not, as in the past, first determine the size, then go to the expropriation. 3. energy-saving, water-saving awareness in the 1970 of the 20th century, the pig and chicken farm mechanization in our country forward under the slogan, the country started building a modern large chicken farms in the climax. Was built as the fully enclosed intensive chicken farms, using artificial light, mechanical feeding and mandatory ventilation, a small number of chicken farms also use mechanical sets eggs and manure. According to statistics, fully enclosed chicken coop per chicken when the annual electricity consumption of 10-kilowatt •, half opened the henhouse when • 2~5 kW (open), when the entire opening is 0.5 kW •, rolling open sheds at 0.45 kW •. Hen house types, power consumption difference is very big, a difference of 10~20. China's energy supply is in short supply. Therefore, in determining the breeding, poultry equipment selection should take full consideration of energy saving issues. Lack of fresh water resources in China, the average annual precipitation is 600 mm. 1988 2474 cubic meters of water per capita in China, only 1/4 of the population all over the world, now reduced to 2300 cubic meters. Hen daily water intake to about 1.5~2 times, so when you 使用电子取景器EVF的机型，也归入单反类，但一般加注“类似”，或注明是EVF取景，如奥林巴斯C-2100UZ、富士Finepix 6900等。 在单反数码相机的工作系统中，光线透过镜头到达反光镜后，折射到上面的对焦屏并结成影像，透过接目镜和五棱镜，我们可以在观景窗中看到外面的景物。与此相对的，一般数码相机只能通过LCD屏或者电子取景器(EVF)看到所拍摄的影像。显然直接看到的影像比通过处理看到的影像更利于拍摄。 单反数码相机的一个很大的特点就是可以交换不同规格的镜头，这是单反相机天生的优点，是普通数码相机不能比拟的。 另外，现在单反数码相机都定位于数码相机中的高端产品，因此在关系数码相机摄影质量的感光元件(CCD或者CMOS)的面积上，单反数码的面积远远大于普通数码相机，这使得单反数码相机的每个像素点的感光面积也远远大于普通数码相机，因此每个像素点也就能表现出更加细致的亮度和色彩范围，使单反数码相机的摄影质量明显高于普通数码相机。 适用性 可以很简单的说，单反数码相机并不是适合任何用户，首先具有必要的专业知识是一方面，其次要用好单反数码相机必须搭配不同型号的镜头，这很可能使镜头的花费高于购买数码相机的费用。 而且在外出旅游时，带上镜头群的相机包的重量也远高于一个普通相机，会成为旅游过程的严重负担。另外单反数码相机在更换镜头时都会让感光元件直接暴露在空气中，因此使用时也必须要注意相机的保养。所以，单反数码相机虽然拍摄质量更高，而且现在价格也下降了很多，但也并非适合所有的用户，用户购买时还是要按需选择。 优势与劣势 优势 在使用同轴直射CCD取景的数码相机尚未普及前，单镜反光相机具有无视差的优势。 精确的取景和对焦，这一点对于微距和远距摄影特别重要。 部分较高阶的DSLR具有可以预览景深的功能。 多数的单镜反光相机可自由更换镜头。 常见的单反镜头比固定镜头相机提供了更广泛的光圈范围，尤其是增加了最大光圈(举例来说，在50毫米定焦镜头上可见到f1.4甚至到f1.0等级的最大光圈)。 这主要带来两个好处: 可以在更昏暗的条件下拍照而不需使用闪光灯。 可以获得更浅的景深。 劣势 quality egg, chicken, ... Development of poultry industry will occupy a certain area of land, there is a modern product with comprehensive rollup of 50,000 chickens laying hens, covers an area of 14.87 hectares (233 acres) more (including Office of hatching, brood rearing, and laying House, eggs, feed processing workshop, Office, etc). The poultry industry should work in land conservation, not accounted for or less cultivated land, wasteland, the principle of slope land. When the chicken farm should generally not available to local arable land area to determine an appropriate level of breeding size and not, as in the past, first determine the size, then go to the expropriation. 3. energy-saving, water-saving awareness in the 1970 of the 20th century, the pig and chicken farm mechanization in our country forward under the slogan, the country started building a modern large chicken farms in the climax. Was built as the fully enclosed intensive chicken farms, using artificial light, mechanical feeding and mandatory ventilation, a small number of chicken farms also use mechanical sets eggs and manure. According to statistics, fully enclosed chicken coop per chicken when the annual electricity consumption of 10-kilowatt •, half opened the henhouse when • 2~5 kW (open), when the entire opening is 0.5 kW •, rolling open sheds at 0.45 kW •. Hen house types, power consumption difference is very big, a difference of 10~20. China's energy supply is in short supply. Therefore, in determining the breeding, poultry equipment selection should take full consideration of energy saving issues. Lack of fresh water resources in China, the average annual precipitation is 600 mm. 1988 2474 cubic meters of water per capita in China, only 1/4 of the population all over the world, now reduced to 2300 cubic meters. Hen daily water intake to about 1.5~2 times, so when you 由于其复杂的机械装置，在同等片幅下，单镜反光相机的体积要大于旁轴照相机。 由于反光镜需要时间进行移动，因此产生相对较长的快门时滞。在使用电子系统的单镜反光相机上，时滞问题还有可能被自动对焦时间拖长。 由于反光镜的往返移动，会造成额外的噪音和震动。有些单镜反光相机具有反光镜预升功能，在拍照之前就把反光镜提升并锁定来减少曝光时的震动。但这仅适用于被摄物体在反光镜预升时会相对保持静止的情形下，因为观景窗在这时是漆黑一片的。 在小光圈的情况下，取景器很暗，难以进行手动对焦。这个问题在自动对焦镜头普及后获得些许改善。 在使用电子闪光设备的情况下，曝光时间受到限制。 由于需要给反光镜留出移动的空间，设计广角镜头更加困难。 单反相机9大品牌排行榜 1:佳能 对于单反相机来说，佳能的霸主地位是无可厚非的，每年的新产品发布会，总有一些让爱好者神经触动的一些创新，购买单反相机，佳能值得考虑 推荐指数: ? ? ? ? ? 2:尼康 尼康相对于佳能的发展期限晚一点，对于两者之间的较量实际上不能同日而语，毕竟两者之间的发展方向是不一样的，而对于很多爱好者而言，往往却把这两款相机作为比较，这其中实际上是有很多误解的，这也是很多单反入门者刚入门时所犯的错误，对于购买中端单反相机，考虑尼康是一种不错的选择 推荐指数: ? ? ? ? ? 3:奥巴 很少去关注奥巴的单反相机，无意中，和几个朋友说起奥巴的单反相机感觉还是不错的，使用过一段时间后，不管是从手感，还是品质，都是很不错的，这也是为什么能把奥巴排在第三的位置，奥巴本身生产的单反相机是很少的，总计不会超过10种单反，但是各种单反相机都有其无与伦比的特色，值得各位影友去关注，再者奥巴本身的艺术品味对于机身设计是相当完美，和完善的，自主研发的Live MOS感光元器件，也是值得品味的，或许在未来的那一年，单反不在是佳能和尼康的天下了，三分天下，或许有奥巴的身影 推荐指数: ? ? ? ? ? quality egg, chicken, ... Development of poultry industry will occupy a certain area of land, there is a modern product with comprehensive rollup of 50,000 chickens laying hens, covers an area of 14.87 hectares (233 acres) more (including Office of hatching, brood rearing, and laying House, eggs, feed processing workshop, Office, etc). The poultry industry should work in land conservation, not accounted for or less cultivated land, wasteland, the principle of slope land. When the chicken farm should generally not available to local arable land area to determine an appropriate level of breeding size and not, as in the past, first determine the size, then go to the expropriation. 3. energy-saving, water-saving awareness in the 1970 of the 20th century, the pig and chicken farm mechanization in our country forward under the slogan, the country started building a modern large chicken farms in the climax. Was built as the fully enclosed intensive chicken farms, using artificial light, mechanical feeding and mandatory ventilation, a small number of chicken farms also use mechanical sets eggs and manure. According to statistics, fully enclosed chicken coop per chicken when the annual electricity consumption of 10-kilowatt •, half opened the henhouse when • 2~5 kW (open), when the entire opening is 0.5 kW •, rolling open sheds at 0.45 kW •. Hen house types, power consumption difference is very big, a difference of 10~20. China's energy supply is in short supply. Therefore, in determining the breeding, poultry equipment selection should take full consideration of energy saving issues. Lack of fresh water resources in China, the average annual precipitation is 600 mm. 1988 2474 cubic meters of water per capita in China, only 1/4 of the population all over the world, now reduced to 2300 cubic meters. Hen daily water intake to about 1.5~2 times, so when you 4:索尼 索尼的单反相机，真不知道如何去说，如何去理解，每每总能听到索尼又有新功能，但是却难见实效，前段时间颁布的降噪功能是能够给拍摄带来很多好处，但是对于一款单反相机而言，拍摄好像有点奢侈，再者说购买索尼的单反相机也是一种非常麻烦的事情，刚上市的时候很多情况下，单反相机都只能通过电话购买，或者说是限购，除了对购买的乐趣除外，还是有很多的不足支出，再者说，索尼的镜头数，真的很少，如果想一次性配备齐全，价钱除外，购买难度也是很强悍的，因为索尼的单反镜头通用的只能和美能达，蔡司，等通用，而这两款中的蔡司的价格不是一般人所能承受的，性能却也无法和相对应的镜头做比较，购买这款单反相机的时候，有待考虑。 推荐指数: ? ? ? ? ? 5:宾得 如果刚步入摄影爱好行列的爱好者，选购单反相机，宾得可以考虑，宾得并不会去发布很多叠叠重复的单反相机，每一款都是非常时尚，非常大方，自主研发的成像引擎供了更高的数据处理速度，并能够生成色彩更准确、层次更丰富的高质量照片，同时还支持高速的视频数据处理。这就是宾得最最值得考虑的地方，在预算不高的情况下，宾得还是不错的选择。 推荐指数: ? ? ? ? ? 6:徕卡 推荐单反:D-LUK4 推荐指数: ? ? ? ? ? 7:理光 推荐单反:GXR 推荐指数:? ? ? ? ? 8:松下 推荐单反:GH1 推荐指数:? ? ? ? ? 9:三星 推荐单反:GX-20 quality egg, chicken, ... Development of poultry industry will occupy a certain area of land, there is a modern product with comprehensive rollup of 50,000 chickens laying hens, covers an area of 14.87 hectares (233 acres) more (including Office of hatching, brood rearing, and laying House, eggs, feed processing workshop, Office, etc). The poultry industry should work in land conservation, not accounted for or less cultivated land, wasteland, the principle of slope land. When the chicken farm should generally not available to local arable land area to determine an appropriate level of breeding size and not, as in the past, first determine the size, then go to the expropriation. 3. energy-saving, water-saving awareness in the 1970 of the 20th century, the pig and chicken farm mechanization in our country forward under the slogan, the country started building a modern large chicken farms in the climax. Was built as the fully enclosed intensive chicken farms, using artificial light, mechanical feeding and mandatory ventilation, a small number of chicken farms also use mechanical sets eggs and manure. According to statistics, fully enclosed chicken coop per chicken when the annual electricity consumption of 10-kilowatt •, half opened the henhouse when • 2~5 kW (open), when the entire opening is 0.5 kW •, rolling open sheds at 0.45 kW •. Hen house types, power consumption difference is very big, a difference of 10~20. China's energy supply is in short supply. Therefore, in determining the breeding, poultry equipment selection should take full consideration of energy saving issues. Lack of fresh water resources in China, the average annual precipitation is 600 mm. 1988 2474 cubic meters of water per capita in China, only 1/4 of the population all over the world, now reduced to 2300 cubic meters. Hen daily water intake to about 1.5~2 times, so when you 推荐指数:? ? ? ? ? 入门级单反 单反相机入门教程 单反相机入门 入门单反相机推荐 单反入门机 入门单反推荐 入门级单反相机 入门单反相机哪款好 单反摄影入门教程 入门单反相机排名 .初级和中级相机的选择顺序为宾得,佳能,尼康,奥林巴斯,索尼。 2.全副为尼康,佳能,索尼。宾得还没有全副。 就宾得与索尼来说，原因:宾得老牌，生产历史长，功底厚。表现在所有宾得单反外观制作工艺精良，使所有单反相机中最好的;内在素质也很好，色彩好，镜头质量高，只是中国市场上数量较少，原因是宾得没把精力放在中国，在日本及欧洲宾得口碑很好。索尼新入单反，技术功底薄，色彩还原不稳定，佳能入门机型做工低劣，有偷工减料之嫌(实际是为了降低成本)。 像这个价位的单反;本人认为性价较高的有宾得Km.索尼a200，奥巴E420在电脑城都是套机不足三千!余款再充实镜头,后两部适用双套,A200块头大,电池强悍,但套头太次,成像平庸!E420小些,传感器略小,但套头质量仅次于宾得,成像素质也不错! 选哪部就看你要大块头还是高画质了! 若能再多几百元,那就首先考虑宾得km,其次尼康D60,至于佳能不想推荐,套头太次,低端机身像玩具! 以上四部都是适用于银子不多,追求画质.不想烧很多镜头的玩家,怎么决择还要你多看看评测.到现场试用再决定!但我以为若不考虑各家那昂贵的镜头,选择套头素质最好一部是最明智的!个人推荐宾得Km!在各家入门相机的套机镜头,宾得的SMC DA 18-55mm/F3.5-5.6 II AL相对于其他品牌的套头，p家的套头做工和用料了更加考究。它有着更加舒适宽大的变焦环，阻尼适中的对焦环，并且宾得Km的套头在对焦和变焦的时候，最前端结构是不会像低端镜头一样转动的! 而它们套头素质排名是宾得Km>奥林巴斯E420>尼康D60>索尼a200 画质最好的尼康D60.宾得Km>奥林巴斯E420>索尼a200 尼康的机器都是D打头的(D60 D90 D5000)。佳能的机器是D在最后面(450D 500D) 7000元以内，你可以买尼康D5000(套机价格:5700元左右)了，套机价格是:D5000可以旋转LED啊，在拍摄高度比较低的东东的时候，很有用啊。 也比较帅气。 当然，D5000相对于D90(套机价格:7800元左右)，也有不足之处。D5000源自D40系列的机身没有配备自动对焦马达，因此普通的AF镜头在D5000上无法自动对焦，只能用搭载超声波对焦马达的AF-S镜头，不过这个看自己的选择了，AF-S镜头现在也比较丰富。 我认为D5000就是一款丰富了功能的D60，仍然属于入门级，和EOS 500D处于同一级。而D90就比较专业了，适合有一定专业需求的用户或者一定水平的发烧友。 D90目前套机的价格是:7800元左右。 不建议入佳能。 quality egg, chicken, ... Development of poultry industry will occupy a certain area of land, there is a modern product with comprehensive rollup of 50,000 chickens laying hens, covers an area of 14.87 hectares (233 acres) more (including Office of hatching, brood rearing, and laying House, eggs, feed processing workshop, Office, etc). The poultry industry should work in land conservation, not accounted for or less cultivated land, wasteland, the principle of slope land. When the chicken farm should generally not available to local arable land area to determine an appropriate level of breeding size and not, as in the past, first determine the size, then go to the expropriation. 3. energy-saving, water-saving awareness in the 1970 of the 20th century, the pig and chicken farm mechanization in our country forward under the slogan, the country started building a modern large chicken farms in the climax. Was built as the fully enclosed intensive chicken farms, using artificial light, mechanical feeding and mandatory ventilation, a small number of chicken farms also use mechanical sets eggs and manure. According to statistics, fully enclosed chicken coop per chicken when the annual electricity consumption of 10-kilowatt •, half opened the henhouse when • 2~5 kW (open), when the entire opening is 0.5 kW •, rolling open sheds at 0.45 kW •. Hen house types, power consumption difference is very big, a difference of 10~20. China's energy supply is in short supply. Therefore, in determining the breeding, poultry equipment selection should take full consideration of energy saving issues. Lack of fresh water resources in China, the average annual precipitation is 600 mm. 1988 2474 cubic meters of water per capita in China, only 1/4 of the population all over the world, now reduced to 2300 cubic meters. Hen daily water intake to about 1.5~2 times, so when you 佳能照出相片来偏暖，适合照人像。nikon偏冷，适合照景色。 我自己有台D60，单位上是佳能5D，虽然5D档次比D60不知道要高出几个。但是从照片的出图来看，我还是喜欢我的D60片子。不喜欢暖色调。个人喜好。再者，nikon是专业做相机的，canon不专业啊~打印机什么的都有~哈哈(玩笑) 单反最主要的不是像素，这是新人很容易误解的地方。只要你不洗超大相片，比如五六米长宽的那种。1000万的像素足矣～我有个朋友用D40，才600万像素，照样出好片子。 行内有句话说得好:拿不拿相机是爱好问题;拿什么相机是收入问题;拍的怎么样是水平问题 D90比500D高半个档次，500D和D5000是一个档次的，D90做工比500D要好，而且定位上更高级，我比较不习惯canon的操作，感觉有点繁琐，500D的屏幕在机身的左下角，左手侧没有按键，不方便啊。再者就操作系统来说，尼康的菜单更加方便易上手。其实nikon的机器一直比canon做的有手感和质感。 呵呵，你跟我当初选择相机的时候心情一样。可以理解~ 再就是跟你说说购买地点的问题，你可以到nikon的官方网站看看销售商的地址，看你家附近有没有销售商。一定要到nikon指定的销售商那里去买，确保自己买的机器和镜头是正品行货。行货的机身和镜头的编码跟保修单上打印的编码是一样的，而且是大陆港澳三地联保。 新手么，先从套机开始吧，等自己熟悉了之后，考虑再买其他的镜头，满足自己的需要。慢慢来吧～ 入门级单反 单反相机入门教程 单反相机入门 入门单反相机推荐 单反入门机 入门单反推荐 入门级单反相机 入门单反相机哪款好 单反摄影入门教程 入门单反相机排名 quality egg, chicken, ... Development of poultry industry will occupy a certain area of land, there is a modern product with comprehensive rollup of 50,000 chickens laying hens, covers an area of 14.87 hectares (233 acres) more (including Office of hatching, brood rearing, and laying House, eggs, feed processing workshop, Office, etc). The poultry industry should work in land conservation, not accounted for or less cultivated land, wasteland, the principle of slope land. When the chicken farm should generally not available to local arable land area to determine an appropriate level of breeding size and not, as in the past, first determine the size, then go to the expropriation. 3. energy-saving, water-saving awareness in the 1970 of the 20th century, the pig and chicken farm mechanization in our country forward under the slogan, the country started building a modern large chicken farms in the climax. Was built as the fully enclosed intensive chicken farms, using artificial light, mechanical feeding and mandatory ventilation, a small number of chicken farms also use mechanical sets eggs and manure. According to statistics, fully enclosed chicken coop per chicken when the annual electricity consumption of 10-kilowatt •, half opened the henhouse when • 2~5 kW (open), when the entire opening is 0.5 kW •, rolling open sheds at 0.45 kW •. Hen house types, power consumption difference is very big, a difference of 10~20. China's energy supply is in short supply. Therefore, in determining the breeding, poultry equipment selection should take full consideration of energy saving issues. Lack of fresh water resources in China, the average annual precipitation is 600 mm. 1988 2474 cubic meters of water per capita in China, only 1/4 of the population all over the world, now reduced to 2300 cubic meters. Hen daily water intake to about 1.5~2 times, so when you