Saturday 29 September 2012

CAMERA OBSCURA [FILM TECHNOLOGY]





Camera obscura 
[Film Technology] 

For hundreds of years scientists have been able to produce images of real scenes- camera obscura- a large room that acted as a walk-in pin-hole camera -to mid nineteenth century. Modern cameras operate on the basic principle of the camera obscura. Light passing through a tiny hole, or aperture, into an otherwise light-proof box casts an image on the surface opposite the aperture.








CAMERA NOT RUN [FILM TECHNOLOGY]




Camera not run  
[Film Technology] 

 

[1] Camera battery does not produce full voltage on load[poor connections between individual cells].

 

[2] Camera Battery fused or circuit breaker open.

 

[3] Not fully charged [insufficient time, charge current inadequate, mains voltage wrong].

 

[4] Battery not delivering full power due to cold.

 

[5] Battery to camera cable has internal fault.[flex to check.]

 

[6] Battery to camera cable too thin or too long for current.

 

[7] Battery self charge discharged due to excessive heat during storage.

 

[8] Camera buckle switch and camera trip switches not set.

 

[9] Camera not sufficiently winterized for cold conditions.

 

[10] Camera not switched on [more than one switch]

 

[11] Camera seized up or stiff [try inching by hand].

 

[12] Mains power supply voltage or frequency not correct for camera motor [if mains].

 

[13] Poor electric contact somewhere. [uses test meter to test voltage at motor].

 

[14] Camera electronic circuits faulty. [plug in spare boards if available.].








CAMERA MATTE [Film Technology]





Camera matte
[Film Technology] 

Hear a separate silhouette on a graphic is set up in front of a studio camera or a video rostrum camera. This shape is made to correspond with a chosen part of the background picture. The equipment, as before, inserts the part of the subject instead. A foreground vertical plane through which a camera shoots.










CAMERA MASTER [Film Technology]






Camera master
[Film Technology] 

Known as camera stock also. The bulk of raw film stock is loaded into magazines, which are attached to the motion picture camera. After exposure, this now precious commodity, the camera master (camera stock) is unloaded and forwarded to lab. Camera original is the camera master.





CAMERAMAN’S EXERCISE [Film Technology]





Cameraman’s exercise
[Film Technology] 

Here is a number of exercise to help practice your camera work. Do them slowly at first, progressing to faster versions later. Doing several operations simultaneously can test the most experienced cameraman.

[1] Pan across a detailed wall surface, at a very constant speed using a wide lens angle, normal lens angle then narrow lens angles. Now slowly tilt up and tilt down, at a constant rate.

[2] Pan across a scene in which a number of objects at different distances from the camera, focusing on each object in turn as you pan (a) stopping at each, (b) in one continuous pan. Try this at different speeds and distances.

[3] Focus hard on a close foreground subject, then tilt or pan to a different subject, pulling focus(focus pulling) [refocusing] as you do so.

[4] Alter your camera height while keeping the subject exactly in center frame. [Make a small mark in the viewfinder at picture centre.] Go from maximum to maximum height at different speeds. Use closer and subjects.

[5] Move the camera towards a subject [dolly in], continuously refocusing for the sharpest image. Use wide lens angle, normal lens angle and narrow lens angles in turn. Try this for various distances, including table top objects. Now practice dollying out similarly.

[6] Move the camera across the scene [truck] from left to right, then from right to left, focusing whatever comes into shot.[objects at various distances.] Do this again, but holding a static subject in center frame.

[7] Arc around a static subject [keeping it center frame], using wide, normal and narrow lens angles.

[8] Take a close shot at a near by subject, tilt up and quickly zoom in to some distant detail without refocusing, this becomes hit-or-miss. Now refocus to distant subject and try again.

[9] Repeat the effect of [5] by zooming instead.

[10] Put a detailed object nearby, then check the maximum focused distance and available depth of field, using wide, normal and narrow lens angles.

[11] With the [10] set up, use various lens angles, and change the camera distance so that the screen image of the subject remains exactly the same size. [Note how other subjects’ proportions change.