水草情迷

各位魚友 , 想問一下用數碼相機來攝影魚缸 , 有沒有什麼心得.
如我想影草都易o的, 但想影o的草既大特寫 , "中"部相機貼住個缸 , 跟住Zoom , 但有好易Focus唔到 , 請問你們有無什麼好既心得?
另外你們影魚缸時會唔會開閃光燈 ? 唔開有黑過頭 , 開左有什麼都睇唔到......

另外如果想影魚 , 係未一樣"中"部機貼住魚缸影 or 離遠o的Zoom埋去?

I use fuji S-602zoom
It's very easy to fous the grass and very faster/easy to fous the fish

Hi,

There are two things you should aware. They are 1) lightning condition and 2) setting of your DC.

1) You should add more light sources to bright up your tank. Then your DC will not switch to flash mode automatically. I perfer using existing lightning condition to flash because it reflects ture colour and depth of the picture.

2) Understand the limit of your DC, i.e. the shortest distance your DC can take. Your DC should be put as close to the tank as possible. Then, the reflection of your own DC would not be seen in your picture.

3) Use shutter priority mode. 1/25 sec is the slowest speed. When lightning condition permits higher speed, chose the faster one.

4) Use continuous shooting mode if your DC have this function. This would make your target fish always in focus.

Hope this can help.

Zoom too much will made 手震 easy,because
1. shutter speed
Example:if you zoom to 8mm(like SLR 40mm),the “safe “shutter speed(will not手震for the 初學者) is about 1/40,but if you zoom to 30mm(like SLR 120mm),the” safe “shutter speed is about 1/120

2. 光圈值
the other reason for do not zoom too much is “the len is not 恆定光圈”,Example:if you zoom the len to 8mm,the max 光圈 may f2.8(I do not know the max. 光圈 for your DC),but if you zoom to 30mm,the光圈may be f8,the max光圈 will become small,the result is the shutter speed much slow down to keep 足夠light to 曝光.

P S.光學變焦與數碼變焦之分別,前文有講,這裡不提

.the 原理of the DC focus is “裂像對焦”(名詞可能錯,但道理是對的),其實在dc電腦內會從lens之對焦點接收到一左一右的影像,再使其重疊而計算出主體與相機之距離,自動對焦便完成,所以如對無物體是”I”形, “裂像對焦”情況下,晶片之計算是”I I”,左右移動便可計算出其焦距,

The reason of “can not auto focus”

1. 對焦點物體是”－”形的話, “裂像對焦”情況下,晶片之計算是”─ ─”,左右無論如何移動都是重疊,所以便不能正確對焦.””
2. 對焦點物體是“淨色”,原因如上
3. 對焦點物體是“低反差”(包括colour OR light), 原因如上
4. 超過了最近的對焦距離
5. 被攝主體移動得太快

解決方法前文有講, 這裡不提

PS. 我多數會用魚眼作對焦點(感覺條魚精神d),但切忌一成不變,創意是無限的.


有錯請諒及指正．

唔夠光,就
1)唔好用閃燈
2)當然如果可以加燈就以加燈為優先;
3)加大個iso(個別相機才有)
4)加大個EF, 即係補光制, 通常由0.1......最大加到2.0
如果影魚要好似SUPERCTW兄影果DO甘清楚, 快門可能要到達60至125了!否則,魚些微的游動都會導致效果不清楚的!

光源的部分要注意~~
找台大光圈的相機~
我是用F707,光圈最大為F2.0
我的拍法是用"快門先決"(S Mode)
將快門設為1/40s~1/80s 視光源而定~~
將Iso設較高(畫質會比較差,雜點會增多)
EV值不建議改變,因為改EV只是改變光圈快門設定,如你光圈F2.0,S1/40的標準設定,你將EV改為+0.3,則你的設定會變為F2.0,S1/30(因為ev值是在告訴相機自動曝光值太少或太多)

简单D,高级机用闪灯延长线,普通机用同步闪灯,O甘快门可以去到1/60或1/125,闪灯由缸顶向下打!试试!!