 | | | "real " cameras in xsi | "real " cameras in xsi 2005-06-12 - By kim aldis
Back
The film back size is pretty much what it says, the size of the aperture
which defines the size of exposed film (or the sensor size in the case of
digital). Film back sizes are dependant upon format rather than camera.
Good place to start is the American Cinematographer's guide but there must
be some good links around if you hunt.
More often than not, Boujou will tell you what the fov is. And probably get
it wrong.
Congratulations, you've now succesfully opened your can of worms. Your next
assignment is to train your worms to speak. Chinese ;-)
kim@(protected)
kim@(protected)
> -- --Original Message-- --
> From: owner-xsi@(protected)
> [mailto:owner-xsi@(protected)] On Behalf Of Dan Yargici
> Sent: 12 June 2005 15:49
> To: XSI@(protected)
> Subject: Re: "real" cameras in xsi
>
> Is there a table of different film back sizes? I have to
> admit to not fully understanding this... the film back size
> is the measurement of a physical piece of the camera or
> digital camera's sensor yes? So presumably this is the hard
> thing to establish? I mean, anyone can find out the lens
> used on a shot, but where does one learn the film back size
> of an Arri Flex 435 Xtreme? Have I completely got the wrong
> end of the stick here?
>
> Cheers,
>
> DAN
>
>
> kim aldis wrote:
>
> >Have you looked at the film plane tab in the camera ppg?
> Enabling this
> >gives you focal length and film back size parameters to mess with.
> >
> >
> >kim@(protected)
> >kim@(protected)
> >
> >
> >
> >
> >
> >>-- --Original Message-- --
> >>From: owner-xsi@(protected)
> >>[mailto:owner-xsi@(protected)] On Behalf Of Stefan Andersson
> >>Sent: 12 June 2005 11:47
> >>To: XSI@(protected)
> >>Subject: Re: "real" cameras in xsi
> >>
> >>another thing... would be really really really really nice
> if the good
> >>people at Softimage could include this as a script for
> future versions
> >>(or change the camera behavior).
> >>
> >>regards
> >>stefan andersson
> >>
> >>
> >>On 6/12/05, Stefan Andersson <sanders3d@(protected)> wrote:
> >>
> >>
> >>>Thanks for the info... I'll see if I can figure this out :)
> >>>
> >>>regards
> >>>stefan andersson
> >>>
> >>>
> >>>On 6/12/05, Dirk <news4dirk@(protected)> wrote:
> >>>
> >>>
> >>>>To determine the field of view use this formula
> >>>>
> >>>>alpha = 2*arctan(d/(2*b)
> >>>>
> >>>>To dertermine the focal length convert the formula as follows
> >>>>
> >>>>b = d/(2*tan(alpha/2))
> >>>>
> >>>>with
> >>>>alpha = aperture angle (FOV)
> >>>>d = 24.892mm (for horizontal)
> >>>>d = 18.912mm (for vertical)
> >>>>b = focal length in mm
> >>>>
> >>>>Pay attention to the different film back values for the
> >>>>
> >>>>
> >>horizontal
> >>
> >>
> >>>>an vertical measurement.
> >>>>XSI unfortunately don't convert vertical to horizontal FOV
> >>>>automatically if you switch from one to the other.
> >>>>
> >>>>
> >>>>
> >>>>Stefan Andersson wrote:
> >>>>
> >>>>
> >>>>
> >>>>>Is there anyone out there that has a conversion script
> >>>>>
> >>>>>
> >>or something
> >>
> >>
> >>>>>to convert camera info to "xsi camera info".
> >>>>>When I try matching footage and have all the info from
> >>>>>
> >>>>>
> >>the client,
> >>
> >>
> >>>>>I still end up "eyeballing" it because I have no idea on how to
> >>>>>convert the info to xsi.
> >>>>>
> >>>>>regards
> >>>>>stefan andersson
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>---
> >>>>Unsubscribe? Mail Majordomo@(protected) with the
> >>>>
> >>>>
> >>following text in body:
> >>
> >>
> >>>>unsubscribe xsi
> >>>>
> >>>>
> >>>>
> >>>--
> >>>http://www.sanders3d.com/
> >>>
> >>>
> >>>
> >>--
> >>http://www.sanders3d.com/
> >>
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> >>
> >>
> >>
> >
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