He is right.
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----- Reply message -----
From: "Darren Coombes" <[email protected]>
To: "Nuke user discussion" <[email protected]>
Subject: [Nuke-users] Arri Alexa sensor size - camera tracking question
Date: Tue, May 29, 2012 01:01
Thanks for the reply Alex, I'll have a look. We have someone here saying that
the 18mm lens would not be an 18mm lens in our tracker settings, I just want to
make sure what they are saying is right.
Cheers.D.
On 29/05/2012, at 4:57 PM, Alex Fry wrote:The "crop factor" is described by the
sensor measurements you input.Your 18mm lens is still 18mm, no conversion is
necessary, your field of view has changed, but not your focal length..
An 18mm lens has a different field of view if its mounted on micro4/3, DX,
super35, 35 stills, 70mm or medium format, but it remains an 18mm lens.
Have a play with Nuke's camera node, tweaking the focal length, haperture &
vaperture knobs to get a feel for the relationship they have to each other.
-Alex
On 29/05/2012, at 4:27 PM, Darren Coombes <[email protected]>
wrote:
Hi, we have some plates shot with the alexa on a 18mm prime lens.I Need to
camera track this material.
On the Arri website, it says the sensor size for the alexa is 23.76 x 13.37mm
when using the ARRIRAW setting with 1.78:1 aspect ratio.
in the camera tracker settings, would I put the film back size as 23.76 x
13.37mm?And then I guess i need to find out the crop factor for that sensor
size and use that when entering the focal length of the lens?
So if we shot on a 18mm lens, and theoretically the crop factor was 1.5 (not
sure what the actual crop factor is yet), you would times 18 x1.5? and that
would give the right focal length?
Can someone point me in the right direction with this? and is my theory of this
right? or am i missing something?
Thanks.
Darren.
Darren Coombes
Compositor
www.resolutiondesign.com.au
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Darren CoombesCompositor
www.resolutiondesign.com.au
resolution: sydney australia tel: +61 2 9360 9908 fax: +61 2
9360 8908 22 burton st: east sydney: 2010 post office box: 614
darlinghurst: 1300 abn: 3305 196 1856
2010 Silver One Show Entertainment Award: Online Branded Entertainment 2009
Gold Promax/BDA Award: Best Broadcast Design Image Spot 2009 Winner Creative
Review Hotshop Award: Post Production / VFX2009 Finalist Creative Review
Hotshop Award: Broadcast Design
The information transmitted, together with the attachments, is intended only
for the person or entity to which it is addressed and may contain confidential
and/or priviliged material which may be subject to copyright. Any review,
retransmission or other use of, or taking of any action in reliance upon, this
information by persons or entities other than the intended recipient is
prohibited. If you received this in error, please contact the sender and delete
the material from any computer or network. No warranty is given by the sender
that any attachments to this email are free from viruses or other defects.
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