App 排行榜

查找应用

Exposure Calculator

发行商: Essence Computing
价格: 0.99 USD 支持应用内购买

应用排名历史

查看Exposure Calculator在中国的下载排名历史。

排名历史显示Exposure Calculator在iOS Store应用商店中的流行度以及其随着时间的变化。您可以追踪Exposure Calculator在不同国家、分类和设备上每一天每一小时的表现。

免费注册来发掘更多!

应用商店优化

追踪市面上每个应用的热门关键词,以及一个应用的搜索位置是如何受关键词的影响而随着时间产生变化的。

应用评价和评级

通过探索应用评价和评级来获取宝贵的用户反馈。根据版本、国家以及日期进行切割,来发掘漏洞,追踪建议并改进您的应用。

推荐

了解应用何时何地在不同国家任意日期、国家、设备和板块上的推荐情况。

应用说明

Takes the guesswork out of what shutter speed to use. Ever struggled with an exposure meter or the camera's auto exposure system and found that it just cannot seem to determine the correct shutter speed? I have and that is why this App was written. There are tables and formulae to help you to work out the shutter speed for yourself, but that's not easy. This App takes some simple information about the lighting conditions, the f-stop of the camera and the ISO rating being used and calculates what the correct shutter speed should be. It is that simple. If you have used the pre-calculated tables before you might be suprised by the answers this App gives you but, believe me, I have implemented the formulae and the pre-calculated tables are approximations (sometimes rather wild ones). The tables do not include all f-stops, the tables do not take account the different ISO values cameras can be set to. This App does.

This App takes this information and presents it in an easy to use form. Just type in the f/stop value using the keypad, type in the ISO rating using the keypad and then select the applicable lighting conditions from the four lighting condition types: Daylight, Twilight, Night and Indoors. Each has a range of Exposure Values to select from.

The App then calculates what the effective EV value is (given the ISO rating) and so can calculate what the actual shutter speed should be. It also shows the applicable row from the standard tables for the EV.

Depending on the ISO rating being used the Exposure value selected from the list can be increased or decreased e.g. if the light is low and the EV is -3 but you are using ISO 800 then the effective Exposure value is zero (ISO 800 counts as +3 to EV) the shutter speed needs to match this value not that selected from the standard lighting condition values.

The tables only show some of f/stop values. For example the tables show f/2.0 and f/2.8 but you might have the camera set to f/2.4. Well it is possible to calculate the exact value so this is what the App does. Coupled with ISO values that do not generate exact EV numbers this value can show you the true value you should be attempting to use. An ISO of 250 adds +1.32 to the EV value. It is a log2 scale.

Now you may not be able to set you camera to the exact value given but it does give you a much better idea of the real shutter speed required rather than trying to guess from the tables (which are calculated on a logarithmic scale and are approximations).

By being able to set the ISO to 250 or 500, etc this App is can calculate the real EV value. If you set the ISO to 1000 then any EV value selected needs to have approximately 3.3 added to it to give the correct EV value. So if the selected EV is 6 then the effective EV with this ISO is actually 9.3. But there is no row for 9.3 in the standard tables and it does make a difference. If the camera is set to f/3.5 then the closest row in the table is for EV9 and f/2.8 (1/60th of a second) or f/4.0 (1/30th of a second).

So do you err towards 1/30th or 1/60th. Well this App actually calculates the exact value and this shows as 1/52nd of a second. Generally a camera cannot be set to this but it can be set to 1/50th so I would try that and then maybe 1/60th and maybe 1/40th. The calculation comes out as 1/50th because the EV is not 9 it is 9.3 and therefore with the ISO at 1000 everything must be treated as brighter and so less exposure is needed.

Being able to see the exact value to use is even more use when long exposures are needed. The standard tables get very vague for low light conditions i.e. EV -6 for f/22 is 64 minutes and for f/32 it is 128 minutes (over an hour more). So if you are using f/28 how many minutes at ISO 1250? Well the answer is 66.9 minutes which is much shorter than you might have guessed.

应用商店优化

人们在寻找一个应用时都使用哪些词? 正确的关键词可以帮助一个应用提高被发现的几率,并且增加下载量和收入。App Annie追踪上百万个关键词,这样您就可以为您的应用获取更多的下载量,并且了解您的竞争对手正在使用哪些关键词。

应用评价和评级

查看评价和评级,了解用户对 Exposure Calculator 的看法。

0

0 条评价

与 App Annie 一起了解上百万个应用的所有信息,掌握应用行业中正在发生的一切。