EF 50mm f/1.8這個超值大光圈鏡頭,加上外掛微距鏡頭後,就更超值了。 Raynox DCR-150/250是相當受到歡迎的附加微距鏡頭,因為它們又小又輕又方便。
整組搭起來,也不過台幣5,xxx元啊!對於像我這種偶而玩玩微距的用戶,是最佳的方案。
DCR-250是在賣怪兵器的楔石買的,因為網拍上買不到。
DCR-150則是在網拍上買的,價格比楔石的報價便宜。
DCR-150/250的放大效果有多好呢?
根據資料, DCR-150是4.8 diopter,DCR-250是8 diopter,diopter值愈大,放大物體的效果愈好。如下表的資料,diopter是5時,可以將物體放大1.25倍,而8時,可以放大2倍。
然而,放大的倍率愈高,對焦距離愈短。diopter為5時,對焦距離約為27公分,而diopter為8時,約為17公分。
以50mm + DCR-150來說,從DCR-150前鏡到物件的距離約為14~19公分。
50mm + DCR-250,約11~13公分。
50mm + DCR-150 + DCR-250,約5~6公分。
Diopter | Power | % Bigger than object | Focal Length |
3 | 1.75X | 75% | 13" |
4 | 2.00X | 100% | 10" |
5 | 2.25X | 125% | 8" |
7 | 2.75X | 175% | 5.5" |
8 | 3.00X | 200% | 5" |
9 | 3.25X | 225% | 4.5" |
11 | 3.75X | 275% | 3.75" |
13 | 4.25X | 325% | 3" |
16 | 5.00X | 400% | 2.5" |
18 | 5.50X | 450% | 2.25" |
20 | 6.00X | 500% | 2" |
至於將DCR-150/250裝在50mm上頭的樣子,YouTube上有影片可以看:Raynox DCR250 super macro lens。
透過轉接環,DCR-150與DCR-250可以合體,有更大的放大倍率,然而對焦距離也會縮短。
我使用兩個轉接環連接DCR-150與DCR-250:49→37,以及37→43。
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由左到右分別是:DCR-150、37→43、49→37、DCR-250+扣接式轉接環
整組組起來,裝上135mm f/2.8 Soft Focus之後的樣子。

以下是用50mm f/1.8搭配DCR-150/250的效果。
用EF 50mm f/1.8拍螳螂,好小一隻:

EF 50mm f/1.8 + DCR-150,全身入鏡:
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EF 50mm f/1.8 + DCR-250,肚子餓,鎌刀抬不起來:

EF 50mm f/1.8 + DCR-150 + DCR-250,好大的臉:

如果你有更長的鏡頭,例如135mm,放大效果會更好唷。以下皆是135mm f/2.8 Soft Focus搭配DCR-250/150拍攝。








使用EF 70-210mm f/4 + DCR-150 + DCR-250,好重好難對焦。

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Mobile01答客問
c.cyrani wrote:我沒有全幅機,無法解答您的問題。
不過不知使用上搭配50mm/f1.8在全幅機上使用不知會否有成相圈的問題呢?
不過,您說的成相圈是否指這樣的情況?

上面那張拍攝所使用的鏡頭是Tamron 18-200mm,口徑尺寸是62mm,大於DCR-150/250本身的口徑接環的43mm(扣接式轉接環是52-67mm),因此在廣角端時會有成週圍黑圈。隨著焦段拉到80mm之後,週圍黑圈就會消失,但仍有輕微四週暗角。


50mm f/1.8的口徑是52mm,但是前鏡片的實際大小約與DCR-150/250口徑相當,應該不會產生週圍黑圈。
若以上的說明有誤,請各方大德指教。
CLOUDWKJ wrote:55-250mm的接環尺寸是58mm,安裝一定沒有問題。
不知道55-250mm 適不適合使用耶
而且,長焦段搭DCR-250/150的放大效果比短焦段佳。
只不過,景深也會變得超淺,因此光圈要縮得很小,有時候f/22還不太夠。
例如這張,Tamron 18-200mm搭DCR-250,在200mm端,快門0.004 sec (1/250),光圈f/22.0,ISO 200,外閃EV+2/3,手動對焦,景深還是太淺。

另一個例子,幾乎與上面那張圖相同的參數設定,拍攝自動鉛筆筆芯,更可以看出景有多淺。

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