Canon EF 200 400 f4L IS lens 1

Canon เปิดตัวเลนส์ EF 200-400mm f/4L IS USM 1.4x Leave a comment

Canon EF 200 400 f4L IS lens

          มาแล้วว น้องใหม่ของตระกูลขาวอวบ Canon EF 200-400mm f/4L IS USM 1.4x งานนี้ไม่ธรรมดาเลยเพราะมาพร้อมกับท่อคูณในตัว 1.4x อีกด้วย ทำให้เมื่อเราคูณระยะแล้วจะได้ระยะ 280-560mm เลยทีเดียว โดยตัวเลนส์นั้นมีราคาอยู่ที่ $11799 หรือราวๆ 350,000 บาทนั่นเอง และมีกระเป๋สำหรับใส่เลนส์ขายอยกกันได้ในราคา $649 ราวๆ 20,000 บาท

ดูบทความ review hand-on ได้ที่ bhphotovideo

Canon EF 200 400 f4L IS lens

Canon EF 200-400mm f/4L IS USM 1.4x
Focal Length & Maximum Aperture Built-in extender at 1x: 200-400mm, 1:4.0
  Built-in extender at 1.4x: 280-560mm, 1:5.6
   
Lens Construction Built-in extender at 1x:
  25 elements in 20 groups (incl. 1 rear filter)
  Built-in extender at 1.4x:
  33 elements in 24 groups (incl. 1 rear filter)
   
Diagonal Angle of View Built-in extender at 1x: 12°-6°10′
  Built-in extender at 1.4x: 8°50′-4°25′
   
Focus Adjustment Inner focusing system
   
Closest Focusing Distance 6.6 ft. / 2m
   
Filter Size 52mm drop-In
   
Max. Diameter x Length, Weight 5.0 x 14.4 inches, 127.7 oz. / 128 x 366mm, 3620g

Overview

Designed to satisfy the discriminating needs of sports and wildlife photographers, the EF 200–400mm f/4L IS USM Extender 1.4X is a high-performance super telephoto zoom lens with an optically matched built-in 1.4x extender for maximum versatility. With a simple flick of a switch, the zoom range can be quickly increased to 280–560mm (f/5.6). This capability is extremely useful in applications where it is not possible to change lenses quickly, while also protecting delicate equipment such as a digital SLR camera’s image sensor in environments with dust and high humidity. The EF 200–400mm f/4L IS USM Extender 1.4X incorporates one fluorite and four UD lens elements, which provide excellent correction of chromatic aberration throughout the entire zoom range for professional quality images with high resolution, contrast and color fidelity, while a 9-blade circular aperture helps deliver beautiful, soft backgrounds. It utilizes inner focusing, ring USM, a high-speed CPU and optimized AF algorithms for fast and accurate autofocusing. And, with Power Focus mode, focus shifts are quiet and smooth, which is essential for filmmaking. Image stabilization is effective up to four shutter speed steps, with three image stabilization modes (standard, panning, and during exposure only) providing excellent results for a wide range of subjects. Optimized lens placement and coatings deliver outstanding color balance, while helping to minimize ghosting and flare. The lens is highly resistant to dust and water, enabling shooting even in harsh conditions. A fluorine coating on front and rear lens surfaces repels dust particles and makes the lens easier to clean.

ที่มา photorumors

บทความนี้เขียนเมื่อวันที่ 15/05/2013

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