Автор: JoeSatriani
Дата: 02-08-13 12:43
Всъщност темата ми стана интересна:
Auto ISO
This new feature alone is also enough to make me love the new 5D Mark II over my old 5D.
Auto ISO is on by default, and not hidden deep inside menus as it is on Nikon.
Canon's Auto ISO is far smarter than any Nikon Auto ISO.
Canon is making use of my invention disclosure, and Canon's Auto ISO automatically takes focal length into effect. On my Nikons I need to reset the lowest shutter speed in the Auto ISO menu as I change lenses, while Canon just knows at what focal length I'm shooting and adjusts accordingly.
The bad news is that although Canon's Auto ISO is way smarter than Nikons, Canon's Auto ISO cannot be adjusted. You either shoot it as Canon has it set, or choose your ISOs manually. Tough.
Again in Canon's favor, Auto ISO is smarter than Nikon's because it also has a "smart soft landing."
With Nikon, ISO bumps up as soon as the shutter speed hits a preset lowest speed, which is after the lens hits its maximum aperture in Pro exposure mode (P, previously called Program). As it gets darker, Nikons open up the lens, then slow the shutter to the set speed, and only then does Nikon start to increase the ISO. Nikons keep increasing the ISO to the preset maximum, and only then do they lengthen the shutter speed after running out of ISOs.
In the 5D Mark II, as it gets darker, the 5D Mark II starts increasing the ISO before you get to the slow limit, and before you wind up at full aperture. It does even closer to what I want than Nikon does, so long as it's choosing the slow limit I prefer.
Canon's inviolate slow speed limits in Auto ISO are those you'd pick for still subjects. They counter hand motion, but not subject motion.
With a 50mm lens, Canon's Auto ISO tries to keep you at 1/40 or faster.
At 70mm, it's 1/80, and at 200mm, it's 1/160.
At 35mm it's 1/30, and at 16mm, it's 1/15.
Canon's Auto ISO is brilliant for shooting still subjects, as I usually do with a 5D Mark II, but since Canon's Auto ISO can't be altered, it's useless for shooting motion with wide and normal lenses. unless you shoot in Tv mode.
Canon's Auto ISO still isn't smart enough to know if you have Image Stabilization switched ON or OFF. Canon's point-and-shoots are smart enough. Drats!
Auto ISO works even with Highlight Tone Priority ON, although of course it starts at ISO 200 instead of ISO 100.
Целият текст тук http://www.kenrockwell.com/canon/5d-mk-ii/new.htm
|
|
![[smilie11]](https://photo-forum.net/forum/smileys/smilie11.gif)
![[smilie3]](https://photo-forum.net/forum/smileys/smilie3.gif)
Стани фен на Фото Форум във Facebook
Фото Форум в Instagram