3D Basics
Section 2 - INTRODUCTION TO "QUASAR"
Mirror Frame
- The one and only mirror angle that will allow for camera alignment is 45 degrees
- The mirror frame was designed to allow for small scale adjustability to the mirror along with the ability to lock it in a rigid and fixed position
- In theory this adjustment should not be necessary as once the mirror is set and locked it should not move and the relative angle should be maintained. Given that the rig can be used in a variety of shooting environments and temperature ranges, this adjustment capability will allow you to bring it back into its intended position should it stray.
- for alignment purposes the mirror should be maintained at precisely 45 degrees even a little variation from this angle will cause difficulty in maintaining camera alignment in both near and distant range
- It is advisable to have an electronic protractor available to check its relative position periodically and make adjustments. Even one degree off will make total alignment frustrating.
- The Mirror Frame on which the mirror sits is dampened with vibration isolating material to help absorb both direct shock to the mirror and also to limit transmission of any vibrations which could be visible in shot
- The actual frame is machined out of a single piece of aluminum to provide a base with no flex
- Positional adjustments are made to the mirror frame via a nodal pivot by fore and aft adjustment screws. Each side adjusts and locks independently. Access to the adjustment screws and locks is maintained at all times
- The Mirror Frame assembly is attached to the rig by two 1" Carbon Fiber Tubes. The carbon Fiber provides extreme solidity with low mass. The carbon fiber has a low resonance transmission value which assists in isolating any vibrations away from the mirror
- The Mirror itself is a 17.25" x 9.2" x 3/8"( 158.7 sq in.) partially front
silvered mirror. The Silvering is set to allow 50% of illumination to pass through while the remaining 50% is diverted. Both transmitted and reflected light remains color neutral, and non polarized and is only decreased in intensity by one stop to each camera.
- The Standard Mirror is suitable for most lens focal lengths used in 3-D shooting situations though it is not without limitations. If the need is for lenses in the Telephoto range to be used then a premium glass would be recommended. This expensive and fragile piece of highly polished and precision engineered glass has reflective tolerances much finer then the standard mirror. This requires the use of a special mirror frame and the advance purchase of two precision mirrors as lead time on this glass is many weeks
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