[SiuSiuMing]

sorry, 小弟又有一d很膚淺o既問題ar, 唔好意思!!
1.小弟想問一問close up鏡同macro鏡o既分別ar??? 我真係唔係好識ar....
2.別外又想問佢地對境深分別有d乜野唔同o既影響呢? macro淺一d, or close up 淺一d??
請教一教路ar!!! 麻煩晒!!! ^^

[oldpear]

close-up通常是指filter, 是一片凸透鏡; macro/micro 是指專為微距攝影而設計的鏡頭(lens)。

(1) 加了close-up filter於鏡頭前端, 大大縮短"最近對焦距離, 使「近攝」成為可行, 但加了這塊filter之後, 鏡頭就無法對焦於無限遠, 而且, 對焦範圍也局限於某段近距離, 至於實在能於那範圍對焦, 看近攝鏡(close-up filter)的放大率而定。macro/micro lens對焦範圍涵蓋無限遠至某個極近距離, 無須另加濾鏡, 而作近攝時影像放大率也很大。

(2) 無論是用close-up filter抑或macro/micro lens拍攝微距照片, 景深都是那麼淺, 但要從不同層面分析:

(2a) 一些zoom lens本身已具有微距拍攝功能, 不靠濾鏡幫助可已經可以作極近距離對焦, 此時的景深是極淺的; 加了close-up filter之後, 對焦距離可以遠些但影像放大率相同, 那麼景深會稍大;

(2b) 微距鏡頭(macro/micro lens)的最近對焦距離其實不會很近, 但影像放大率已經比聲稱能極近對焦的普通鏡頭大得多, 亦因為對焦距離(物距)較遠, 景深較大, 同時, 微距鏡頭的最小光圈也非常小, 常達到 f/32, 所以更可營造特大的景深。

[SiuSiuMing]

非常非常感激oldpear前輩o既幫忙, 你o既解釋好詳細同深入ar!!!!
對於小弟黎講, 真係獲益良多,真係唔知點多謝你好!!
小弟一定會用心咀嚼每一個字ga la, 唔會浪費oldpear前輩o既心機o既....
好感激你......^^

[mini_mashimaro]

唔該晒oldpear兄，但係我重有少少唔明，可唔可以再為我解答呢? thx

1. 放大率即係咩意思呢，係咪即係將對焦物件再放大幾倍??

2. close-up filter 即係用o黎縮短對焦距離?

3. marco lens可唔可以同close-up filter一齊用????? 如果可以，咁有咩好處??

4. close-up filer通常會同咩lens一齊用? 遠攝lens?

thx^^!

[ZeissIkon]

多只香爐多只鬼！
多塊玻璃必然降低照片質素，
可換鏡頭又負擔得起的話
當然是換支Marco鏡頭好！
機械相機時代還有 Bellow 及
Extension Tube 選擇。

[Welta]

重有種adapter將你支鏡頭調轉裝,
都有marco鏡效果,
二次大戰後德國d兵工廠轉左去生產某牌子相機,
此牌子一時忘記了準確名字,
機身同鏡頭分兩條生產線生產,
做成鏡頭生產多,
但機身生產少既不平衡現象,
點知就出事喇,
生產機身間廠接到生產收音機既訂單,
就停止生產相機去搞收音機,
d鏡頭點安置呢?
比佢老闆諗到攞黎整個adapter係前面,
賣比其他相機生產商,
宣傳可以一鏡兩用,
又比佢過關,
係咪好值得香港人學下呢?
而唔係得閑就去鬧下政府.....唔講喇!

[ZeissIkon]

補充一點：
反轉支鏡裝成像可能會變形，
用來 copy 些精確的平面未必理想，
(例如翻拍郵票)
還有一點：
越 Wide Lens 就越 Close up !

[neu]

..." 重有種adapter將你支鏡頭調轉裝,
都有marco鏡效果" ...

i remembered some friends of mine did this trick! they bought some adapter rings (not easy to find) and placed their canon fd 50 f1.2L in a reverse order for magnification. it was not as good as a real macro lense, (e.g. the canon ef 100 f2.8 macro) BUT imagine having the quality of "L" series for close up!! all you need is that adapter ring!!

one more thing: i read about using 1.4x + extension tube + ef100 macro f2.8. it is also tricky here as there is no space to add anything after the 100 f2.8. but with the extension tube, you can have a more tele + macro lense. i have not tried this myself, as i don;'t have a 1.4x. but the idea seems hightly creative.

[ZeissIkon]

but no af and auto exposure !!!!!!!

[neu]

..."but no af and auto exposure !!!!!!! "...

for macro shooting, you rarely use auto focus, as it takes a lot of tilting to adjust to the best dept of field. even when u use a canon ef f180 "L" macro w/ USM auto focus, the best thing to do is still manuel focus.

for auto exposure, still. u cannot trust the auto exposure / reading 100%. need to add f stops for compensation. the closer you get, the more you block the light and need to add f stops. the auto exposure is not totally reliable ga!

guess it is still very "old fashion" and takes a lot of manuel thing for macro stuff. at the same time, that's where the fun comes!!

[ZeissIkon]

我同意在某些微距攝影環境是應該用手動對焦。

但相機的鏡後測光裝置
是可以包涵因像距增加而失去的光，
因為所失的光已如實地投影到感應器上了。

再補充一點：
如果用 Canon EF Lens 反轉支鏡裝，
又如何收細光圈呢？

[neu]

sorry if i misled you on that issue.

the "trick" of using reversed lense was only used with FD lenses of canon. i don't think it's possible to use ef lense for such way. at least i have not seen my fds able to do that.

when i picked up photomacrography, i already usef ef system. so i am referring to my eos/ef experience here. one thing always confused me: how come i couldn't get the right exposure with the auto exposure/reading? i protested to my tutor and he said i was blocking the light reflected to the subject. it was worse if i used 1:1 magnification rate. so my experience is that the internal metering is not always reliable and adjustment is needed.

back to the fd system, i remembered it was terribly dark if use long extension tube or bellow. even difficult to id the subject, so in that kind of situation, it'd take some math work then.

[ZeissIkon]

很高興能和你討論和分享經驗。
雖然有文化上的差異，我并沒有被誤導，
只是想更廣泛地發掘問題而已。

我的第一部單鏡頭反光機也是 canon
1973年的 FTb QL 連 FD 50mm 1.4 賣hk$900.00
當時對一名中學生己經十分昂貴的了。

言歸正傳，
依我的經驗，相機的鏡後測光裝置 TTL meter,
是可以準確測量出因像距增加而減少的光，
因為一個好的鏡後測光裝置所 "看" 到的光，
應完全等於底片所 "看" 到的一樣，
但我依稀記得，有些 "old fashion" bellow or extension tube
是沒有光圈連動的，你必須收細光圈測光，
你遇到到的問題是否這個原因呢？
又是否光線太暗，需要很長時間曝光，
底片產生“交互失效 "reciprocity failure" 之故呢？