一、相机上的AM和FM分别是什么意思
这里AM就是相机自动聚焦的意思。也就是说如果把拨钮选到AM的话，你半按快门，相机自动聚焦并显示合焦点。FM则是手动聚焦的意思，如果选择FM，那么你得自己转动聚焦环来聚焦。
1、FM拍照调焦技巧
对焦在摄影中非常重要，一张好照片的基本要求就是要正确对焦，确保对焦点清晰。拍摄人像：一定或尽量对准人眼聚焦。拍摄大场面的风景：对准无限远处聚焦，或把相机的对焦点对准画面前1/3的位置处，这样可获得景深最大、最清晰的照片。 拍摄近距离的特写（如微距摄影）：对聚焦的要求更高，因为通常拍摄这样的主体时，镜头离得很近，光圈也较大，如果焦点不实，照片会非常模糊。所以在这种情况下要很仔细地进行对焦，或者选择手动对焦以保证清晰弱光环境：
1、AM拍照调焦技巧
自动对焦是利用反差来实现的。在光线不足的情况下，反差小，有时自动对焦会“失灵”，你可以对准主体附近的线状物体或有较明显分界的位置进行对焦。如果拍人像，可以让对象竖起一根手指，放在眼睛旁边，以供你对焦。
二、相机A，s，M，P等是什么意思
A是光圈优先，就是你手动控制光圈，由相机选择快门速度。s是快门优先，你手动选择快门，喜欢控制光圈。m是全手动模式，相机不干涉你，p是程序自动模式，相机控制光圈快门，其他全部由你设置，p模式是半傻瓜模式，一般用于抓拍。不知道这样回答可否满意
三、M/A-M相机上什么意思
am [简明英汉词典]
abbr. 调幅 (amplitude modulation)
am [简明英汉词典]
[am,em]
prep.是, 在
n.a.m.上午, 午前
abbr.[域] armenia , 亚美尼亚
[军] amplitude modulation, 调幅
am [用户词典]
=> be.
order [简明英汉词典]
[5c:de]
n.次序, 顺序, 正常(工作)状态, 秩序, 会议规则, 命令, 定购, 定单
vt.命令, 定购, 定制
order [用户词典]
1/'c:de(r); 'crdl/
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[u] way in which people or things are placed or arranged in relation to one another 次序; 顺序:
* names in alphabetical order 按字母顺序排列的名字
* events in chronological order, ie according to times, dates, etc 按时间先后排列的事件
* arranged in order of size, merit, importance, etc, ie according to size, etc 按大小、 功绩、 重要性等排列的.
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condition in which everything is carefully and neatly arranged 整齐; 有条理:
* put/leave/set one's affairs, papers, accounts in order 把个人的事务、 文件、 帐目整理得井井有条
* get your ideas into some kind of order before beginning to write. 把思绪理清再写. cf 参看 disorder.
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[u]
(condition brought about by) obedience to laws, rules, authority 治安; 秩序; 规矩:
* some teachers find it difficult to keep order in their classes/to keep their classes in order. 有些教师觉得课堂秩序很难维持.
* the police must try to restore order. 警方必须努力恢复治安. cf 参看 disorder.
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[c] ~
(for sb to do sth); ~ (that...) command or instruction given by sb in authority 命令; 指挥; 指示:
* soldiers must obey orders. 军人必须服从命令.
* he gave orders for the work to be started/that the work should be started immediately. 他发出指示要立即开始工作.
* my orders prevent me from doing that, ie i have been instructed not to do it. 我接到指示不可做此事.
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[c] ~
(for sth) (a) request to make or supply
(goods) 定购; 定单; 定货:
* fill an order, ie supply the goods asked for 交付定货
* he gave his order to the waiter. 他把他点的东西告诉服务员了.
* we've received an order for two tons of coal. 我们已收到两吨煤的定单.
(b) goods supplied 交付的货:
* a delivery van has brought the grocery order. 送货车已把定购的杂货送来了.
* your order has arrived. 您的货已到.
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[c] written instruction that allows the holder to be paid money or to do sth 汇票; 授权凭证:
