[分享]無意間發現的白平衡鏡頭蓋

ccchen
個人積分：370分
文章編號：5493379

370分

樓主

2008-03-29 3:34

一如往常,在來往上海與昆山之間的空檔
下意識不自覺的走進位於上海火車站旁的環龍商場-上海目前占地最大的攝影器材城
買完最新的攝影雜誌,走進旁邊一家專賣腳架背包配件的店
與熟識的老闆寒暄幾句後,正準備離開,瞥見一旁掛在牆上的小配件
一個長的怪怪的鏡頭蓋,前方像是遮光罩一般,
雖然心中大概猜出是什麼,但還是跟老闆確認一下

"蒯老闆,這是什麼?"
"喔,這是調整白平衡用的!"

就這樣,我那越來越重的fastpack350裡又多了個很輕的新玩具
調整白平衡的方式很多
從機內的設定自動白平衡,機內預設的各種白平衡,色溫白平衡
到機外的輔助工具,如灰卡,前一段時間很紅的珍珠板,還有軟體後期的調整
各有千秋,各有巧妙不同
今天就來看看這小玩意有什麼樣的效果吧!

這東西真的很簡單,就兩塊,一塊底座旋緊在鏡頭或uv上,而前蓋就組合在底座就好了
[分享]無意間發現的白平衡鏡頭蓋

測試相機為40D 用raw拍攝無後製轉jpg上傳,photo style 設為中性
先來看看自動白平衡的效果,恩,好像白了點,因為我的毯子是淡藍色的...
[分享]無意間發現的白平衡鏡頭蓋

由於室內的光源只有一支日光燈管,所以用個日光燈白平衡看看,阿~真藍阿...
[分享]無意間發現的白平衡鏡頭蓋

這張是裝上後拍攝做為自訂白平衡的sample
[分享]無意間發現的白平衡鏡頭蓋

自訂白平衡鏡頭蓋效果圖,恩...很接近現場的顏色了
[分享]無意間發現的白平衡鏡頭蓋

總結
優點
1.價格便宜
2.可兼做鏡頭蓋,可是怎麼不直接把鏡頭蓋做成這半透明塑膠算了
3.白平衡調整表現不差

缺點
1.上遮光罩時會卡到那條繩子的接環,所以要先拆掉遮光罩才能扣上
2.用料不算很好,底座有點軟軟的
3.暫時想不出來有什麼好去苛責這麼便宜的東西

2008-03-29 3:34 發佈

文章關鍵字白平衡鏡頭蓋

supramessiah

supramessiah
個人積分：18分
文章編號：5495283

18分

2樓

2008-03-29 11:46

之前EBAY上就看過.
也查了使用者的評語.

一般觀點是:
這個基本上鬆鬆的, [不能也不是安全鏡頭蓋].
變成雞肋一般, 因為沒有必要帶一個塑膠蓋到處走.
而且根據使用者測試結果據說不準.
您可以到更多地方與光線條件下試試.
不能當安全的保護蓋, 白平衡也不准,
那不如直接帶個灰卡, 就地取材或直接帶張白紙.
自己自動定義白平衡說不定更準更方便.

我個人因為相信那些國外使用者所以也就沒買.

希望您用得愉快.
買了就買了, 自己有用到覺得好才重要.

以下是原文轉貼:

Mennon white balance lens cap - avoid

--------------------------------------------------------------------------------

I recently decided to try a white balance lens cap from Ebay. They're so cheap that there was very little risk in buying one. I figured that even if it wasn't good for WB, I could always use it as a regular cap.

Wrong on all counts (other than that I can afford to waste the money). The brand being sold is "Mennon" (on most auctions you can clearly read the brand name in the pictures). When you order, you specify the size you want. What you get isn't a nice secure lens cap. Instead, there's a ring that screws into your filter threads (or, if you use a protective filter, stacks on your filter) and a slip-on cap for the ring. The cap is secure enough that it's not likely to pop off by accident, but it's loose and wobblyIt won't protect against dust if the wind picks up. There's also a cord that you can attach to your wrist or something else (assuming you like having lens caps dangling all over the place)..

Since I'm paranoid about vignetting, I didn't want to stack the ring on my filter. Fortunately, the cap fits the outside of my 17-55 IS well enough for balancing, though I wouldn't trust it for protection. So I didn't get lens protection and white balance in one handy package.

Fine, so I can carry it in a pocket, pop it on as needed, and still get some value out of it. Not. The instructions say to put it on, zoom to telephoto, point it at the light source, defocus, and set the WB. I found that easy to do. However--and this is a disaster in a WB cap--the translucent plastic in the cap isn't a well balanced white. Instead, it seems to have a slightly warming cast. The result is that my pictures wind up sharply bluish--so blue that I consider them unusable.