2013年7月10日 星期三

Hasselblad 500c, Pinhole Lens ^_^ My First Time Pinhole Photography 針孔攝影第一次

I've had this "pinhole lens cap" from Rising for quite a while now, but I never had the chance to take it out for a test shoot. Taking advantage of a day off, I decided to bring it out to soak up some sun and experience pinhole photography. In addition to the camera and pinhole lens cap, a tripod and a cable release are essential tools for pinhole photography.

這個Rising出的「針孔鏡頭蓋」買了有好一陣子了,一直沒有機會拿出來試拍,趁著一天放假拿出來曬曬太陽,也體會一下針孔攝影。除了相機、針孔鏡頭蓋以外還有三腳架和快門線都是針孔攝影不可或缺的工具。



Mounted on the Hasselblad 500c with the "pinhole lens cap."
裝上「針孔鏡頭蓋」的 Hasselblad 500c  



Specifications of the "pinhole lens cap":
f185 (for convenience, using f192 for metering)
Angle of view: 62 degrees (it is recommended to frame using the 80mm standard lens)
「針孔鏡頭蓋」的規格:
f185 (使用上以f192測光較方便)
視角62度 (建議直接用80mm標準鏡頭構圖)  


Setting up the tripod in the center of the Chiang Kai-shek Memorial Hall square, I used the wider-angle lens Carl Zeiss Distagon 4/50 C to frame the shot. First, I took a photo with the optical lens for comparison, also to set the aperture and shutter values. At the moment, at f192, it required approximately 10 seconds of exposure.


在中正紀念堂廣場中央架好腳架,用較「針孔鏡頭蓋」視角更廣的廣角鏡頭Carl Zeiss Distagon 4/50 C來構圖,先拍一張光學鏡頭的照片作為比較,一方便也確定好光圈和快門的值,當下換算f192大約是需要10秒鐘曝光。



This is the image taken with the Carl Zeiss Distagon 4/50 C wide-angle lens.
這是 Carl Zeiss Distagon 4/50 C 廣角鏡頭的成像  


Next, I switched to the "pinhole lens cap." At this point, the tripod became crucial. Changing lenses requires avoiding any movement of the camera and tripod. If accidentally moved, it's advisable to reconfirm the framing, as film and developing in the digital age can be quite expensive. Once the "pinhole lens cap" was securely installed, I pressed the cable release and counted silently to 10. 1, 2, 3,... 10. Done. Around 3:00 PM, there were inevitably people moving about in the square, so the blurred figures were expected.


接下來換上「針孔鏡頭蓋」,這時三腳架是重點,更換鏡頭過程須避免相機和腳架的移動,不小心動到的話,建議再構圖確認一次,畢竟在數位時代底片和沖片都是很貴的,還是小心為妙以免浪費。「針孔鏡頭蓋」安裝妥當接下來就是按下快門線並默數10秒鐘1、2、3、、、10,完成了。下午 3:00左右,廣場上有人是一定的,所以人影晃動的影像是預期中。



這就是針孔成像?
Is this what pinhole imaging looks like?


After developing the film, I measured the proportions of the images. It would have been a more accurate choice to use the Carl Zeiss Planar 2.8/80 C for framing, as several photos captured buildings that were too large due to the wide-angle lens, resulting in them being cut off in the pinhole images. The main subjects became incomplete, which can be considered a case of failed work.


底片洗出來後,我量了一下成像的比例,改用Carl Zeiss Planar 2.8/80 C來構圖應該是比較正確的選擇,因為有好幾張相片中的建築物因為在廣角鏡頭了拍得太大,在針孔成像時都被切到了,主題建物變得不完整,算是失敗作品的案例。


Link to the "First Time Pinhole Photography" album.

「針孔攝影第一次」相簿連結。

Yashica Electro 35 GT and Tele/Wide Lens Set @ Songshan Tobacco Factory 松山菸廠

2013/7/10

Can non-interchangeable lens RF cameras capture wide-angle or telephoto shots?

The answer is yes, we can achieve this by using external wide-angle and telephoto lenses.

However, we need to address the issue of the RF camera's viewfinder first. Generally, non-interchangeable lens RF cameras only have a framing frame for one focal length in the viewfinder. Therefore, when we attach a wide-angle lens, the original framing frame becomes too small. Conversely, when attaching a telephoto lens, the framing frame becomes too large. To solve this problem, besides jokingly drawing new framing frames on the original viewfinder (just kidding!), we can use an external viewfinder.

For example, if the lens focal length on the RF camera is 50mm, attaching a 0.7x wide-angle lens is equivalent to 35mm. At this point, we just need to find a 35mm external viewfinder to attach to the flash hot shoe of the RF camera for framing.


不可換鏡頭的RF相機可以拍廣角或遠景嗎?

答案是可以的, 我們可以用外接式的廣角鏡和望遠鏡來達到這個目的.

但是要先解決RF相機觀景窗的問題. 一般不可換鏡頭的RF相機的測距觀景窗都只會有一個焦段的構圖框. 因此, 當我們外接廣角鏡頭後, 原構圖框就變得太小了. 反之, 接上望遠鏡頭, 構圖框就又變得太大. 為解決這個問題, 除了在原測距觀景窗上自己畫上新的構圖框(開玩笑的!), 就是採用外部光景窗.

舉例來說, RF相機上的鏡頭焦距是50mm, 裝上0.7倍的廣角鏡後, 就等於35mm, 這時只要找一個35mm的外接觀景窗裝在RF相機的閃燈熱靴上, 就可以用來構圖了.


The Yashica Electro 35 series RF cameras have designed a set of lens accessories to meet this demand: (1) 0.8X external wide-angle lens, (2) 1.3X external telephoto lens, and (3) an external viewfinder with framing frames for both wide-angle and telephoto shots. The fixed lens focal length on the Yashica Electro 35 is 45mm, so after attaching the external lens, the new focal lengths become 36mm and 58.5mm. While 36mm may be considered wide-angle, 58.5mm should still fall within the range of standard lens focal lengths.


Yashica Exectro 35系列的 RF相機, 因應這項需求就設計了一組鏡頭附件 (1)0.8倍外街廣角鏡頭,
(2)1.3倍外街望遠鏡頭, (3)具有廣角與望遠2個構圖框的外接觀景窗. Yashica Electro 35上的固定鏡頭焦距是45mm, 所以裝上外接鏡頭後, 新的焦距便成為 36mm 和 58.5mm. 36mm或許可稱為廣角, 但58.5mm應該還算在標準鏡頭焦段的範圍內.



Yashica Electro 35GT and Tele/Wide lens set



The Songshan Tobacco Factory has been converted into a cultural and creative park for some time now, and I hadn't had the chance to take some old (building) photos. Taking advantage of a few days off, I went to Taiwan this time to visit, and also to test the Yashica Electro 35 GT and the external wide-angle and telephoto lens set. Below are several sets of photos comparing the perspectives of 36mm, 45mm, and 58.5mm.

The first set of comparison photos is of the maternity ward next to the Xiaoshandang.


松山菸廠改成文創園區有一陣子了, 一直沒有機會去拍些老(建物)照片. 趁著連休幾天出發去台年前走這一遭, 順便測試一下Yashica Exectro 35 GT和外接廣角望遠雙鏡頭組. 以下就是幾組 36mm, 45mm, 58.5mm 視角比較的照片.

第一組比較照片是小山堂旁的育嬰房


f = 45mm x 0.8 = 36mm


f = 45mm


f = 45mm x 1.3 = 58.5mm


The second set of comparison photos is of the skyscrapers in the Xinyi District. The 58.5mm one clearly has vignetting.


第二組比較照片是信義區的摩天大樓群, 58.5mm這張明顯有暗角



f = 45mm x 0.8 = 36mm


f = 45mm


f = 45mm x 1.3 = 58.5mm


This dual lens set does not have coated lenses, so it may not have anti-glare capabilities. In practical terms, it's more convenient to use at the wide-angle end. The inconvenience lies in the four-step process for focusing: (1) using the parallax of the built-in viewfinder in the camera for rough focusing, (2) reading the focusing distance on the fixed lens, (3) checking the corresponding table on the external lens to obtain the actual distance, and (4) adjusting the focusing distance on the fixed lens to match the actual distance.


這套雙鏡組是沒有鍍膜的鏡頭, 所以應該沒有抗耀光的能力, 實用上還是以廣角端使用的機會較多. 較不方便的地方是需要四個步驟來玩完成對焦 (1)由相機內建觀景窗的疊影成向來對焦(2)讀取固定鏡頭上的對焦距離 (3)查詢外接鏡頭上的對應表取得實際距離 (4)調整固定鏡頭上的對焦距離至實際距離.