Saturday, July 19, 2014

Tamron 500mm Reflex Lens 騰龍500mm反射鏡頭

I bought a used Tamron 500mm f/8 mirror reflex lens last year. This kind of mirror reflective lens was produced in the 70s when I was learning film photography. It was created for photographer shooting with a longer focal length but in a compact size and light weight. However, this kind of reflective lens dropped out in favor in the 90s.

This time when I was taking scenic photograph in Pickering, I tested this lens and put it on the Lumix G10 body with an adapter ring. In order to ensure sharpness and stability, I used a tripod and timer.

Advantage:  The length of the mirror lens is shortened by a combination of 2 mirrors to reflect light back and forth between the ends of the lens before passing the light to the camera. Hence the size of the mirror lens is only one third of the convention lens and the mirrors are much lighter and cheaper than the optical glasses. With such a compact size, it is easy to hand hold the camera.

Disadvantage:  A mirror lens has a fixed focal length of 500mm and a fixed aperture of f8. Therefore, we cannot change the depth of field which is very narrow and difficult to focus. Bokeh effect created from out of focus highlight is always distracted with some "doughnut rings". Image appears a bit softer. Better focus requires a good and steady tripod with bright viewfinder.

500mm mirror lens from Nikon, Zeiss and Tamron.

Light from the left passes back and forth between two mirrors before going to the camera on the right.

Tamron 500mm mirror lens(C$120) on the Lumix G10.
加幣120元的二手騰龍500mm反射鏡安裝在Lumix G10機身。
Nikon AF-S 500mm f/4 at C$9,000.

Photo equipment:
Nikon D300s, GP-1 GPS
Nikon AF 17-55mm f/2.8
Nikon AF 80-200mm f/2.8
Nikon Coolpix P7700 28-200mm f/3.5-5.6
Lumix G10 with Tamron 500mm f/8 Mirror Lens

去年我買了一個騰龍500釐米8光圈二手反射鏡頭。這類鏡頭在我學習菲林 (膠卷) 攝影的七十年代開始出現,為攝影師提供長焦距而軽巧的鏡頭。可是,這類反射鏡頭到九十年代便式微了。這次有機會去多倫多碧谷寧拍攝風景照片,我將這支反射鏡頭用接環安裝在Lumix G10的機身作測試。為了保証拍攝的清晰和穩定,我用了三腳架和自拍掣。

優點: 反射鏡頭加了兩片鏡子,進入的光線在兩者間折射,鏡頭的長度大大縮短。因此,反射鏡的體積祇是傳統鏡頭的三分之一,而反射鏡片比光學鏡片較輕巧和亷宜。由於體績小,反射鏡頭可輕易手持拍攝。

缺點: 由於反射鏡頭祇有500釐米定焦和f/8固定光圏,因此不能改變窄景深而對焦也較困難。散景效果也受影響,背景出現礙眼的「甜甜圈」狀光環,拍攝的影像也較為鬆柔。要有效對焦便要依賴優質和穩定的三腳架和明亮的觀景器了。

(Click photo for a larger view)
【 Lighthouse & Girls  ● 燈塔與少女】

#1.  The distance of the scene captured in standard focal length at 55mm.
Nikon 300s, 17-55mm f/2.8 @55mm, f/10, 1/250s, ISO 200 

以標準鏡55mm 拍攝。

#2.  A closer shot at 200mm.
Nikon 300s, 17-55mm f/2.8 @200mm, f/10, 1/250s, ISO 200
以200mm 遠攝鏡拍攝。

#3.  These two girls were captured on the beach with a wide angle lens at 25mm.
Nikon Coolpix P7700, 24-200mm @25mm, f/3.5, 1/800s, ISO 200

#4.  Lighthouse shot at 200mm.
Nikon 300s, 17-55mm f/2.8 @200mm, f/3.2, 1/2500s, ISO 200 


500mm Reflex Lens  ● 500mm 反射鏡頭】

#5.  I captured the girl when she treated her flying hairs.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 800

#6.  I penned my camera and followed these two girls on the dyke.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 800

#7.  I waited till the girl on the left moved with an attractive posture.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 800

#8.  They returned to the boat.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 800

#10.  Finally, they were photographed peddling back in 55mm focal length.  Image taken from an expensive and convention lens appears much sharper and clearer!
Nikon 300s, 17-55mm f/2.8 @55mm, f/8, 1/400s, ISO 200

【Lighthouse & Seagulls  ● 燈塔與沙鷗】

#11. The distant lighthouse and seagulls captured in focal length at 110mm.
Nikon 300s, 80-200mm f/2.8 @112mm, f/8, 1/6400s, ISO 800 

以110mm 拍攝燈塔與沙鷗。

#12.  I use 500mm mirror lens to focus on the lighthouse.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 3200 


#13.  With a tripod, I focus carefully on the bird and used self-timer.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 1600 


#14.  These two birds were shot with some distracting "donut rings" on the background.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 1600

#15.  My focal point is on the small speed boat.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 800

#16.  When the bird on the right tends to move, I press the camera button.
Lumix G10, Tamron 500mm, f/8, 1/4000s, ISO 800 



  1. 喜欢#3作品的构图:二人,二灯塔,和独木舟的编排。

  2. 反射鏡不宜拍攝風景,它對反光點會產生波波喧特殊效果,這是它的特點.

    1. Johnny 兄: 謝謝你的意見,如我在網誌的描述,我十分同意反射鏡並非拍攝風景照的理想鏡頭。它是要將遠景近攝,所以傳統廣角鏡是拍攝風景照的其中選擇。你提到的「波波喧」不明所指,是否「波波圈」,即我所指的「甜餅圈」(donut ring) 的礙眼效果?如是,我相信此乃其中反射鏡的致命傷,造成式微的其中主要原因之一罷!

  3. #14 & #16 = very cute! My favourite is #14.