[openwong]

各位C-hing,請問用微距環影macro會影響PQ嗎?因為微距環中間沒有鏡組,還有用長鏡當macro影(例:384)和105 f/2.8vr,有咩嘢分別呢?麻煩各位師兄解答,多謝~

[王迦南]

微距環沒有鏡片，原則上不會影響照片質素。


然而，成像位置延長了，中央聚焦時邊緣卻已在焦點外，形成了祇有中央清而4周矇矓的情況。

[Obi-Wan]

openwong, "請問用微距環影macro會影響PQ嗎" <=== YES

try to think this way

A 50mm macro lens has a resolution of, say 100 lines per mm resolution.

If u use an extension tube of 50mm between the lens and sensor, the minimum focusing distance is shorted, but the distance from the focal plane and the lens increases. WILL THE SAME LENS PRODUCE SAME RESOLUTION, that is 100 lines per mm resolution on the sensor??? Please be reminded that the image has be enlarged FOUR times!

王迦南
"微距環沒有鏡片，原則上不會影響照片質素。" <===== NO!!!! u enlarge ALL the lens defects such as chromatic aberration etc.

"然而，成像位置延長了，中央聚焦時邊緣卻已在焦點外，形成了祇有中央清而4周矇矓的情況。" <==== NO if u use a REAL macro lens which have been designed to give a FLAT FIELD of image as much as possible. When u focus at a distance 0.5 m with a flat field lens, ALL the points on a plane parallel to the film plane will be in focus.


Most lens are designed to be as flat field as possible. But macro lens is very good, e.g. When u use Tamron 90mm or Canon 100mm macro to shoot a newspaper, everything in the centre to the edge will be sharp eventhough the letters on the edge are in fact farther to the camera than the centre part.

[茶水亞四]

有冇影響就唔知道，
但係用左幾年，仲未見畫質有什麼影響。
可能我冇雷射眼掛。

[tntcat]

要知道一般鏡頭並非為拍攝微距而設計的,加上近攝環來拍微距只是將鏡頭與底片之間的距離拉遠了,令底片上的成像相對地放大了,這並非影響照片質素,而是照片質素一定及不上用專門為拍攝微距而設計微距鏡頭.

[茶水亞四]

其實........咁多位師兄有冇用過？

我放張相請大家了解，其實睇到有咩影響。

機身　：NIKON D200
焦距　：70 mm
感光度：640
微距環：20mm

[茶水亞四]

其實我可以唔洗收到光圈咁細。
一般影公仔，收到 f/8 已經得。

[茶水亞四]

公仔全高7cm，
我只影左佢半身，原相做 reside 咁多。

[茶水亞四]

再黎一張：

機身　：NIKON D200
焦距　：135mm
感光度：640
微距環：36mm

[王迦南]

好野！

[eedbt]

質素一定及不上用專門為拍攝微距而設計微距鏡頭

D5000 + LB5 +12mm ET 70mm 1/200 f/11 ISO400

[eedbt]

質素一定及不上用專門為拍攝微距而設計微距鏡頭

D5000 + LB5 +12mm ET 70mm 1/200 f/11 ISO400

[eedbt]

100% corp 1200 x 1200

[RyzenMaster]

好明顯D200高ISO影像鬆散!

[茶水亞四]

AthlonFX，
的確如此，當時光源不足，只好用升ISO去影。
當係小試牛刀。