angle of view / CCD Size

Re: angle of view / CCD Size

35mm film runs through a still camera horizontally. It runs through a movie camera vertically.

So a still camera uses the area between the sprockets as the height of the frame (getting 24mm of height) and then just spreads out its width for 36mm. A movie camera uses the area between the sprockets for the width of the frame, and only uses 18mm for the height.

Still camera frame size = 36x24mm. Movie camera maximum frame size = 24x18mm. They use the same film stock (well, the perfs are a tiny bit different) but because they use the film in a different way they get different frame sizes.
 
Re: angle of view / CCD Size

hi all

as to Anartiste's question whether all this technical data on a
camera's optical system is of any importance, i have this to
offer:

while i think Barry_Green has a point when he says that
you won't worry about focal length values to an excessive
degree of precision when shooting your typical indie feature
(or just about any film for that matter), there are definitely
projects around that require the availability of precise technical
information on the optical systems employed.

what motivated me to come up with this focal length chart stuff
was a project in which i will film a guy doing his morning routine
in a bathroom. the camera is positioned behind the bathroom
mirror, so the hapless subject winds up staring straight into the camera.
we're planning on building a bathroom set for this and
in order to get the geometry of the place along with the placement
of the props right, we need to design a set in virtual 3D space and play
around with it until we like what we see.

obviously, for this to work, we need to know what the camera
sees at any given focal length... hence my table, hence the
usefulness of such information for my project...

so this stuff definitely has it's applications in practical cinematography...
just not in everyday cinematography ;)

cheers,

serra
 
Re: angle of view / CCD Size

hi there,

serra's web link appears to be broken at the moment. i found his chart posted on another website, so i'll repost it here.

Z ----- DVX ---- 35mm

00----- 4.5----- 32
05----- 4.8----- 34
10----- 5.2----- 37
15----- 5.8----- 41
20----- 6.4----- 46
25----- 7.0----- 50
30----- 7.6----- 55
35----- 8.2----- 59
40----- 8.8----- 64
45----- 9.5----- 69
50-----10.3----- 74
55-----11.3----- 81
60-----12.5----- 90
65-----14.1----- 101
70-----16.1----- 116
75-----18.7----- 135
80-----22.1----- 159
85-----26.4----- 190
90-----31.8----- 230
95-----38.5----- 278
99-----45.0----- 325

i am interested to find out whether there is a formula that defines the relationship between the z number and focal length so i can fill in the gaps.

also on a related point, the dvx100 has a 1/3" CCD, but the actual sensor size is smaller.

> as the math can't be
> the source of the problem, i come to question the CCD
> dimensions that i'm using for my calculations. i'm operating
> in 16:9 letterbox mode and for that setup, i use a horizontal
> CCD dimension of 0.33 in. and a vertical CCD dimension of
> 0.186 in. can anybody make a statement as to whether
> these dimensions are on the money?

according to this link:
http://www.dpreview.com/news/0210/02100402sensorsizes.asp
the actual sensor size is 4.8mm x 3.6mm.

cheers,
malcolm
 
Re: angle of view / CCD Size

hi all,

apologies - i have reposted the version of serra's chart with 35mm still camera equivalents as i did not see page 2 of this thread.

i would remove this part of my post, only that i posted it as a guest user, and the board won't let me. if you are an administartor on this board, please feel free to trim this post.

the part about CCD size is still relevant though!

regards,
malcolm
 
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