D-21 vs Alexa
Posted 20 October 2010 - 07:12 AM
I'd be very interested and grateful if any professionals with experience in both these cameras would let me know their thoughts regarding how they compare.
Thanks in advance.
Posted 22 October 2010 - 02:41 PM
I see really no pros for the D20/D21, besides having the OV and being totally noiseless because of the fan-less cooling system. The Alexa fan is also very quiet, though. And the Alexa already seems to be easier to rent, they are popping up in just about any rental right now whereas the D20/D21 always was a bit rare.
You can find most of the info on www.arridigital.com
Posted 22 October 2010 - 02:46 PM
Posted 22 October 2010 - 05:13 PM
Posted 22 October 2010 - 06:45 PM
What about the mechanical shutter in the D-21? My understanding is that this obviates the issues associated with the sensor's rolling shutter, giving a smoother, more film-like motion capture (at the expense of halving the EI). Is this seen as an advantage or is the gain in motion smoothness not worth the loss of sensitivity? What about the benefits of an adjustable shutter angle?
For feature work with a larger lighting budget is the 200 ASA base sensor rating on the D-21 not regarded as fast enough? I had thought the low light capabilities of Alexa were more useful for TV work where the lighting budget is more restricted.
I guess I'm curious to know whether the industry consensus is much like Marc's response, that there are no real advantages to using the D-21 over Alexa, other than an optical viewfinder, no fan noise and full resolution retention using anamorphic lenses.
Please forgive any ignorance in my questions, my background is mechanical, but I'm trying my hardest to get my head around the digital stuff.
Posted 22 October 2010 - 07:56 PM
is the 200 ASA base sensor rating on the D-21 not regarded as fast enough?
Basically, yes. Unless your show is all day exteriors or something. With the Alexa available, the value of the D-21 is dropping like a stone.
Posted 23 October 2010 - 12:45 AM
The downside is, it's hellish expensive to build.
Posted 23 October 2010 - 05:21 AM
But besides the higher price, don't forget that an optical viewfinder also makes the camera much heavier. Nevertheless I'm all for an OV model of Alexa. It's just the question how this goes together with ISO 800 and upwards...
The mechanical shutter has some advantages with regard to rolling shutter as you wrote - whether that's an issue depends on the type of scene you are filming. On the other hand you can open the digital shutter to > 180 degrees, but that gives you a different rendition of motion which I don't like as much.
I like shooting from the shoulder (if it fits the scene), so I'm a bit biased for the lighter Alexa vs. the heavier D21.
Posted 08 November 2010 - 09:38 PM
Posted 29 July 2014 - 06:50 PM
What is the advantage of the optical viewfinder?
No one here has mentioned the most obvious advantage to the Optical viewfinder.
It's much easier to do critical focus with an optical finder, and it's much less eye-strain.
Another point being overlooked here, is that you're not going to find any working Alexa's for
under $10K, including the viewfinder. I think the Arri D-21 is an excellent choice, and some
DPs feel that it is the most film-like of all the digital cameras, even more so than the Alexa.
Arri in Munich still services these cameras, and they can be dropped off at Arri CSC or
Arri Burbank and the Arri folks will ship them to Munich for you. If you can afford the lighting
package needed for interiors due to the 200 ASA, then I think it's an excellent choice.
Little Rock, AR
Edited by Jerry Murrel, 29 July 2014 - 06:54 PM.
Posted 29 July 2014 - 07:22 PM
Here's an impressive video shot with the Arri D-21.
This was lit properly, and was well graded in post.
Little Rock, AR