無超聲波自動對焦一般來說,超聲波對焦鏡頭比傳統對焦鏡頭靜和快。 使用了一個或更多的低散光度鏡頭元素低散光度鏡頭元素能減低彩色的色差。 不穩定影像穩定器能減低手震時產生的模糊影像,特別在長焦距或陰暗情況下。根據倒數的定律,影像穩定化比無影像穩定鏡頭能有1到3個光圈優點。 金屬接腳平價鏡頭通常會使用塑膠接腳,而較昂貴的專業的鏡頭會使用金屬接腳。一般來說,金屬接腳會比較耐用的及當鏡頭改變很多。當相機主要使用一個鏡頭,接腳物料並不是很重要。 內置對焦內置對焦鏡頭不會因設定焦點而改變其大小。 固定前鏡頭固定前鏡頭在變焦及/或對焦時不會轉動,故可容許攝影師用花瓣狀遮光罩,固定前鏡頭能更容易利用極化濾鏡。 天氣密封天氣密封鏡頭可防止塵埃及水份浸入。當鏡頭不是防水的,此類鏡頭可適用於下雨及朝湿環境。有些密封只可防水或防塵。天氣密封只適用於類似天氣密封相機內。 支援插入濾鏡插入濾鏡使用於那些前鏡頭過大或視野不容許於鏡頭前傳統濾鏡的鏡頭。通常遠攝及超廣角鏡頭支援這類濾鏡。 |
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| 可用的接環 | FourThirds |
| 應用 | 運動, 野外 |
| 類目 | 超遠攝 |
| 倍增器 | 2× |
| 穩定器 | 否 |
| 焦距 | 300 mm (平) |
| 鏡片組 | 11 群組含有13 元素 |
| 視角 |
35毫米: 不適用 數碼: 4.2° |
| 葉片數目 | 9 |
| 最大光圈 | f/2.8 |
| 最小光圈 | f/22 |
| 最短焦距 | 240 cm |
| 放大 | 不適用 |
| 濾鏡大小 | 43 mm |
| 大小 | ∅ 127 × 285 mm |
| 重量 | 3290 g |
| 記錄 |
|
| 自動對焦速度 | 1 項 (由近攝到無限遠) |
| 自動對焦聲音 | |
| 內置對焦 | 是 |
| 內置變焦 | 不適用 |
| 固定前鏡頭 | 是 |
| 接駁類型 | 鐵 |
| 天氣密封 | 是 |
| 插入濾鏡 | 是 |
| 超聲波自動對焦 | 否 |
| APS-C大小的圈 | 不適用 |
| 低散光度鏡頭元素 | 是 |
| 硬機殼 | LSH-1738 (不包括) |
| 軟機殼 | LS-1SH (包含) |
| 遮光罩 |
LH-120 (包含) 可印刷的遮光罩 |
| 三腳架接合器 | 包含 |
9 December 2005
I spend a lot of time photographing birds. They don't cooperate. You need a lot of lens and a lot of light to get a decent shot. This lens is simply terrific at both. The colors are excellent, the pictures are crisp across the entire image and there is no chromatic aberration anywhere.
The four thirds system provides very quick auto focus, crisp and responsive manual focus and relatively light weight. I say "relatively" because this is a big lens. You'll need a tripod or monopod to use it in all but the brightest conditions.
The lens is amazingly sturdy in the field. It was undamaged by a fall that cracked two of my ribs. It works consistently and reliably in very hot (90 degrees plus) and extremely cold (-45 F) conditions. I've carried it outdoors all day at temperatures below zero and never had a problem.
Highly recommended.
14 May 2007
I take a lot of high school soccer photos. Light is bad and the action fast. I think this lens is perfect. It is heavy and powerful. It gets the job done. There is almost no distortion and the it puts me on the field with action. It is not easy to use, a tripod is necessary, although if you have good upper body strength a monopod works. Nothing is like it.