ARRI Alexa 的评价 必读
http://www.deakinsonline.com/forum2/viewtopic.php?f=2&t=1672
Fan noise level: The Alexa is silent and Red is not
Alexa will probably be more comfortable on the shoulder
The Alexa is pretty small but no where near as small as the Epic.
The Epic is a second generation system that fixes many of the problems of the Red One.
There are already four or five $100 million+ 3D films set to use the Epic including The Hobbit, Spiderman 4, Ridley Scott's next sci-fi film and some others.
Roger Deakins:
Roger » Mon Jan 17, 2011 1:28 pm
We are recording uncompressed Log C with the Codex system. Arri RAW is not available right now but will be in a few months, which should facilitate the recording of the full 12 bit depth and 3K resolution the camera is capable of. We have not had any problems with the camera or our recording system to date and I am very pleased with the image quality we are getting.
I use the camera at the 800 setting for interiors and night work and at 400 for day exteriors. I did shoot tests with the camera at a 200 setting and found that the image can be matched in with little problem.
Roger
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Joined: Tue May 31, 2005 2:34 pm
Location: Torquay, Devon UK / Santa Monica, CA USA
There has been a lot of 'banter' about the two camera systems and sometimes it becomes quite partisan. Much of what I read is not the same as the information I am being given by experienced camera technicians in whom I have absolute trust.
I am told that the Red and Alexa have exactly the same sensor but each uses it to gather data in a different way. The Red team has biased their camera for optimum resolution by using an array of smaller pixels, whereas Arri has biased their camera towards optimum colour depth and latitude through a use of slightly larger 'more sensitive' pixels. Apparently, it is not possible to do both at this time and with this same sensor.
From the images I have seen I believe that the Alexa does indeed have better colour rendition and greater image detail in the highlights and shadows. On the other hand I wouldn't say the image it produces appears any less sharp than that of the Red even though it does in theory deliver an image with less resolution. The falloff from a highlight into a shadow area would seem superior to me.
I am not experienced with the Red at all so I only say this in respect of the films I have seen that were shot on that camera. I have seen the Red viewfinder and I wouldn't say it was any better than the electronic viewfinder on the Alexa. Neither is a substitute for an optical finder. As for as the camera system itself, I would say that the Alexa is a better design. It looks and feels like a film camera but one that is both simple to use and lightweight. For me, there did not seem a large learning curve from using a 535B to using the Alexa.
I have been a user of Arri cameras all my career so I must also admit to being somewhat partisan. However, I have now been shooting with the Alexa for some months and I have only been impressed by the camera's capabilities.
I'm sure I will be shot down for writing this post. I am not a technical person and I, frankly, don't understand the technology as well as most of the people who post on this site. In the same way that some cameramen prefer Panavision to Arri cameras or Fuji to Kodak emulsion, some will prefer the Red over the Alexa. That's not the same as saying one is actually 'better' than another. However, I do know what my eye tells me.
Fan noise level: The Alexa is silent and Red is not
Alexa will probably be more comfortable on the shoulder
The Alexa is pretty small but no where near as small as the Epic.
The Epic is a second generation system that fixes many of the problems of the Red One.
There are already four or five $100 million+ 3D films set to use the Epic including The Hobbit, Spiderman 4, Ridley Scott's next sci-fi film and some others.
Roger Deakins:
Roger » Mon Jan 17, 2011 1:28 pm
We are recording uncompressed Log C with the Codex system. Arri RAW is not available right now but will be in a few months, which should facilitate the recording of the full 12 bit depth and 3K resolution the camera is capable of. We have not had any problems with the camera or our recording system to date and I am very pleased with the image quality we are getting.
I use the camera at the 800 setting for interiors and night work and at 400 for day exteriors. I did shoot tests with the camera at a 200 setting and found that the image can be matched in with little problem.
Roger
Site Admin
Posts: 2706
Joined: Tue May 31, 2005 2:34 pm
Location: Torquay, Devon UK / Santa Monica, CA USA
There has been a lot of 'banter' about the two camera systems and sometimes it becomes quite partisan. Much of what I read is not the same as the information I am being given by experienced camera technicians in whom I have absolute trust.
I am told that the Red and Alexa have exactly the same sensor but each uses it to gather data in a different way. The Red team has biased their camera for optimum resolution by using an array of smaller pixels, whereas Arri has biased their camera towards optimum colour depth and latitude through a use of slightly larger 'more sensitive' pixels. Apparently, it is not possible to do both at this time and with this same sensor.
From the images I have seen I believe that the Alexa does indeed have better colour rendition and greater image detail in the highlights and shadows. On the other hand I wouldn't say the image it produces appears any less sharp than that of the Red even though it does in theory deliver an image with less resolution. The falloff from a highlight into a shadow area would seem superior to me.
I am not experienced with the Red at all so I only say this in respect of the films I have seen that were shot on that camera. I have seen the Red viewfinder and I wouldn't say it was any better than the electronic viewfinder on the Alexa. Neither is a substitute for an optical finder. As for as the camera system itself, I would say that the Alexa is a better design. It looks and feels like a film camera but one that is both simple to use and lightweight. For me, there did not seem a large learning curve from using a 535B to using the Alexa.
I have been a user of Arri cameras all my career so I must also admit to being somewhat partisan. However, I have now been shooting with the Alexa for some months and I have only been impressed by the camera's capabilities.
I'm sure I will be shot down for writing this post. I am not a technical person and I, frankly, don't understand the technology as well as most of the people who post on this site. In the same way that some cameramen prefer Panavision to Arri cameras or Fuji to Kodak emulsion, some will prefer the Red over the Alexa. That's not the same as saying one is actually 'better' than another. However, I do know what my eye tells me.
