Автор: vigour
Дата: 06-04-05 12:40
Недостатъци на 350Д спрямо 20д:
1. The EOS 20D has a rear QCD (Quick Control Dial) which can be used to set exposure compensation, flash compensation, shutter speed or aperture in manual mode and has several other functions. The same functions are available in the Digital Rebel XT, but require the pushing of buttons. The advantage of the QCD is you can do things faster and without taking your eye from the viewfinder.
2. The EOS 20D can shoot at 5 frames/second, the Digital Rebel XT can shoot at 3 frames/sec
3. The EOS 20D can shoot a burst of 23 high resolution JPEG frames before the buffer fills, The Digital Rebel XT can shoot 14 frames
4. The EOS 20D has 9 autofocus zones, the Digital Rebel XT has 7
5. The EOS 20D provides full cross-type performance with maximum apertures as small as f5.6, yet it achieves up to 3 times the standard focusing precision when used with EF lenses featuring maximum apertures larger than or equal to f/2.8. The autofocus system of the Digital Rebel XT is inherited from the film Rebel XT body and has normal precision f5.6 sensors.
6. The EOS 20D autofocus is specified to operate in 1 stop lower light than the Digital Rebel autofocus (-0.5 EV vs +0/5 EV)
7. The EOS 20D autofocus is faster than the autofocus on the Digital Rebel XT
8. The EOS 20D has a top shutter speed of 1/8000s, the Digital Rebel XT has a top shutter speed of 1/4000s
9. The EOS 20D has a flash x-sync speed of 1/250s, the Digital Rebel x-sync speed is 1/200s
10. The EOS 20D has a pentaprism with a 0.9x viewfinder magnification, the Digital Rebel XT has a pentamirror with 0.8x magnification.
11. The EOS 20D has a highest ISO setting of 3200, the Digital Rebel XT has a high ISO setting of 1600.
12. The EOS 20D is good for 1000 shots (no flash) on a single battery charge, the Digital Rebel XT is good for 600.
13. The EOS 20D has a PC terminal for use with an external flash or strobe, the Digital Rebel XT does not.
14. The EOS 20D maximum flash sync voltage is 250v (for both the hotshoe and PC terminal), the Digital Rebel XT maximum sync voltage is 6v
15. The EOS 20D has a high performance shutter designed for increased reliability (100,000 cycles), the Digital Rebel XT has the normal Canon shutter (about 50,000 cycles).
16. The shutter lag time of the EOS 20D is 65ms, the shutter lag time of the Digital Rebel XT is 100ms.
17. The high-speed mirror drive give the EOS 20D a shortened viewfinder blackout time (115ms) compared to the Digital Rebel XT (170ms)
18. The EOS 20D sensor (8.2MP, 22.5 x 15mm) is very slightly larger and has slightly more pixels than the Digital Rebel XT sensor (8.0MP, 22.2 x 14.8mm).
19. The EOS 20D has a multi-controller on the back of the camera can be pushed in eight directions, as well as down in the center, to simplify selection of the AF point, correction of white balance, trimming of images during direct printing, scrolling of magnified images etc. The Digital Rebel XT uses push buttons for the same functions.
20. The EOS 20D has top, front and rear covers made of a magnesium alloy for added strength and rigidity. The top, front and rear covers of the Rebel XT are plastic.
21. The EOS 20D has 18 custom functions, the Digital Rebel XT has 9 (List of XT custom functions)
22. The EOS 20D ships with Adobe PhotoShop Elements 2, the Digital Rebel XT ships with ArcSoft PhotoStudio 5.5. Adobe have an upgrade offer from Elements to full Photoshop CS for $299. This offer applies to copies of Elements which were supplied bundled with Canon products. Since Photoshop retails for up to $599 ($649 list), this can be a significant saving.
Въпроса ми е кога се използва ISO 3200 и скорост 1/8000. Недостатъците на 350Д не са малко но заслужава ли си 20Д 400$ отгоре?
Иначе за обективите аз съм решил че 17-85 IS е идеалното решение за мен, но обичам и макрофотографията, затова всъщност не взимам 20Д веднага ама мисля за вариант 2.
За момента по-добро макро от това не знам:
EF-S60mm f/2.8 Macro USM
http://www.waltersphotovideo.co.uk/productimages/efs60mm.jpg
35mm film equivalent focal length Approx. 96
Angle of view (horzntl, vertl, diagnl) 20°40', 14°10', 24°30'
Lens construction (elements/groups) 12/8
No. of diaphragm blades 7
Minimum aperture 32
Closest focusing distance (m) 0.2
Maximum magnification (x) 1
Distance information Yes
Image stabilizer No¹
AF actuator USM¹
Filter diameter (mm) 52
Max. diameter x length (mm) 73 x 69.8
Weight (g) 335
Magnification - Extension Tube EF12 II 1.28 - 0.20¹
Magnification - Extension Tube EF25 II 1.61 - 0.44
Lens hood ET-67B
Soft case LP1016
и т.н.
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/ а пък другото после. Ама малко ще трябва да додадеш над 2000 ![[smilie11]](https://photo-forum.net/forum/smileys/smilie11.gif)
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