BG-E3 Battery Grip

無標題文件: "●因為搭載省電的 CMOS 感測器和高效能的「 DIGIC II 」之故，所以可以使用與小型數位相機「 PowerShot S70 / S60 」一樣的小電池「 NB -2L H 」，它雖然只有約 720m Ah ，卻具有與 EOS 300D 的 1100m Ah(BP-511) 大電池相同的拍攝張數能力 * ，在常溫 20 ℃ 下，可拍約 600 張；低溫 0 ℃ 下，大約 450 張。

●為提升大量攝影和垂直攝影時的操作性及便利性，特別為 EOS 350D 設計出專用的大容量電池把手「 BG-E3 」。它可同時裝入 2 個 (1 個也可以 )NB -2L H 電池，最高可拍攝約 1,200 張影像。另外，設置與橫拍感覺相同的直拍專用按鈕群，包括快門鈕、電子轉盤、 AF/FE 鎖定鈕、 AF 框選擇鈕、光圈值 / 曝光補償設定鈕等等主要且常用的按鈕。此外，為滿足使用者的期待，也可裝入 3 號 (AA) 電池 (6 顆 ) 。

* NB -2L H 充飽電力時使用。
* 因為 3 號 (AA) 電池不是常用的攝影電源，所以不列出可能的拍攝張數。"

E-TTL II, The new Canon EOS E-TTL II flash system and compatible lenses

E-TTL II, The new Canon EOS E-TTL II flash system and compatible lenses: "The Canon EOS E-TTL II Flash System

With the announcement of the Canon EOS 1D mark II 8MP DSLR and the 35mm film based Elan 7N/7NE, Canon have introduced a new flash system called 'E-TTL II'.

Basically this is a new flash algorithm, similar to the existing E-TTL, but designed to give better results under difficult situations, such as when there is a very bright reflection from a small object in the scene.

Just like E-TTL there is a preflash which is used, along with ambient light metering, to determine the flash exposure using the center 17 metering zones. Zones which differ greatly in brightness are given less weight since they are likely to be reflections from small, highly reflective, objects.

With lenses which return distance information, this may also be taken into account by the flash algorithm, but the point to note here is that the E-TTL II system works with ALL Canon lenses, it's just that those which return distance information provide an additional parameter for flash calculation. Even without distance information ETTL II should provide better results in difficult situations. So all your lenses will work just fine with E-TTL II, it's just that under some circumstances, E-TTL II compatible lenses might give slightly better exposure when using shoe mounted on-camera direct flash.

In general, if a lens uses a ring type USM motor, it returns distance information and so is E-TTL II compatible. Not all USM lenses use ring USM motors. Those which do not offer full time manual focus ( e.g. the Canon EF75-300/4-5.6 USM), do not return distance information. Lenses using AFM (arc form motors) do not return distance information (e.g. 50/1.8, 24/2.8).

Notable lenses which you might think would return distance info but don't are the 50/1.4 USM and the 85/1.2L USM. The tilt-shift (T/S) lenses are manual focus, and so of course do not supply distance information.

Non-current"

PhotoNotes.org Dictionary - E-TTL

PhotoNotes.org Dictionary - E-TTL: "E-TTL.

(Canon) Evaluative through-the-lens flash metering, an EOS-specific flash metering technology.

E-TTL works by issuing a white light preflash from the main tube. This preflash illuminates the scene with a known flash level. The camera’s standard evaluative metering system then meters the flash pulse and sets the flash output accordingly. It does this prior to the shutter opening. E-TTL metering was enhanced in 2004 with the introduction of E-TTL II.

cf. A-TTL, EOS, E-TTL II, evaluative metering, preflash, TTL, type A camera.

Entry last updated 2004-02-11. Term 426 of 1486."

E-TTL II.

(Canon) Evaluative through-the-lens flash metering II, an EOS-specific flash metering technology introduced in 2004.

E-TTL II is an enhancement to regular E-TTL flash metering. It adds two basic functions.

First, flash metering patterns are dispensed with and the camera instead examines all evaluative metering zones both before and after the E-TTL preflash is emitted. It then discards or biases out any metering zones with excessively bright measurements during the preflash. This minimizes the risk of highly reflective surfaces throwing off the flash metering.

Second, it incorporates distance data from compatible lenses when appropriate, much like Nikon’s flash metering technology. This data assists the camera in determining correct flash output for the range in question.