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[. . . ] Canon's HDTV lenses are, so to speak, a compilation of our basic philosophies. [. . . ] Meet Canon’s new HDgc series lenses, a compilation of Canon’s advanced technologies.
Optical Performance of HDgc Series
Aberration Correction for HDgc Lenses
In the HDTV system the pixel size is about half. Therefore, the spread of a point image caused by a spherical aberration, coma etc. The MTF varies as the focus changes and even if the image is slightly out of focus, the MTF is greatly influenced as shown in Graph 1. HDgc greatly contributes to correcting and minimizing these aberrations at the same time maintaining high MTF throughout the edge of the picture.
0. 02
0. 01
0
0. 01
Defocus(mm)
＜Graph 1＞
Special Optical Elements
With the goal of minimizing chromatic aberration, the HDgc series lenses utilizes special elements including an artificially re-crystalized element, “Fluorite”, with extraordinary dispersion characteristics and the newly developed “Hi-UD” (high index ultra low dispersion) glass. Thus virtual ENG studio systems called for an optional Encoder Unit to be put on the zoom and focus ring of the lens. With the introduction of 16 bit resolution Rotary Encoder Devices built into the new enhanced digital drive unit, the lens can simply be integrated into a virtual digital studio system without any additions. The encoders also enable superior precise control. The zoom servo provides a dynamic range of 0. 5 sec. [. . . ] Mass
• Reduced Chromatic Aberrations • High and Flat MTF • Countermeasures Against Ghosting and Flares
16:9 1/2 inch 1. 0X 16X 5. 7 – 92mm
1:1. 4 at 5. 7 – 71. 6mm 1:1. 8 at 92mm 62. 9° x 38. 0° 4. 3° x 2. 4°
2. 0X
11. 4 –184mm
1:2. 8 at 11. 4 – 143. 1mm 1:3. 6 at 184mm 34. 0° x 19. 5° 2. 1° x 1. 2°
0. 6m (10mm with Macro)
67. 2 x 37. 8cm 4. 1 x 2. 3cm at 5. 7mm at 92mm 34. 6 x 19. 5cm at 11. 4mm 2. 1 x 1. 2cm at 184mm
W x H x L = 163. 9 x 106. 3 x 196. 7 mm 1. 47kg
VTR SWITCH INFOMATION DISPLAY On/Off SWITCH INFOMATION DISPLAY DIGITAL FUNCTION SELECTOR INDEX MARK AUX1 SWITCH
CANON BCTV ZOOM LENS
DIMENSIONS
F. [. . . ]
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