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| Why using RBT frames: For problem free projecting of stereo slides, it is undoubted necessary that both stereo slides frame (meaning the 50x50 frames) are accurately produced and providing a well aligned picture on the screen. An exact alignment of the slides on the screen is inevitable. By using the RBT stereo slide frames (system Oemichen) mounting small frame slides is going to be incredible easy, because the system allows you to correct the position of the slide in the horizontal as well as the vertical direction. After adjusting the position of the slide and protecting it for future accidentally miss adjustment, the frame will be closed. |
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| The RBT system provides 5 frames for different slide sizes. First the format 23x33 mm. There are not many 3D cameras from the past dealing with this format. The RBT company is currently building new cameras providing the picture size 23x33 up to 23x35 mm. But always keep in mind the shift space you need to create the window. |
23x33 mm. |
| The next size is 23x31,5 mm. Again only new cameras are providing this size. But very often this size is chosen to mount pictures taken with the 23x33 size or larger. | 23x31,5 mm. |
| The next size is 23x28 mm. This is still a very popular size for people using the old ’50 and ’60 cameras. Cameras like the Belplasca and the FED are providing this size. The main advantage of this size is that these cameras are build to provide a human realistic stereoscopic landscape image, with a fixed lens separation of 62 mm. |
23x28 mm. |
| The next size is 23x21 mm. Also very much used in combination with old cameras. In the first place is this the Realist stereo camera, much used in the US. But also the Duplex, TDC, Edixa, Iloca, Kodak, Bell & Howel and Wray need this frame size. |
23x21 mm. |
| The final size is 23x16 mm. made for special cameras or problem pictures, taken with the format 23x21 mm. This half frame format is often coming from ‘mono’ cameras having a stereo adapter on the front like the Stitz and Ashay Pentax adapters. But also the Hugo de Wijs macro lens. |
23x16 mm. |
| How the system works: With the adjustment in vertical direction, faults in height of both slides can be solved. Height differences arise during the picture taking. Especially with ‘self build’ cameras having a miss alignment of the film guide or when using two separate cameras which are not equally aligned with regards to the horizon. But unfortunately height differences are never totally cancelled out when taking the picture so they have to be corrected when mounting it in a frame. To fix each slide in the stereo frame, the small strips with knobs, accompanied with each box of RBT frames, have to be used. The knobs on the strip fit in the perforation of the film and the strips will fit in the small channels above and under the cadre of the frame. |
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| On the right you see the strips placed in such a way that the picture does not need any adjustment of height. In the strips very small holes are located, indicating the deviation direction of 0,1 mm. with regards to the position when it was placed up side down. |
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| Every following picture illustrates the position of the strips with the wanted deviation. |
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| Besides the height alignment you are also able to adjust the horizontal position of slides to compose the 'window', NOT the stereoscopic effect, this was already set when taking the picture (lens separation) |
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| When you always
make pictures with similar objects distances, meaning the
stereoscopic effect and the window, RBT provides a small
tool with every box of frames. This is an H-shaped
plastic piece. When you find the optimal position of the
slide, height and window correctly adjusted, you place
the plastic tool in the middle of the frame and cut of
the arms of the plastic tool to the right length. Then
you have a dedicated tool for your camera to quickly
mount your slides in RBT mounts. It does not help for all slides taken with your camera. Then you have to manually adjust the slide anyway. |
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de Wijs, Design and production of stereoscopic instruments,
Populierstraat 44, 4131 AR Vianen, Netherlands,
Tel. +31 (0)347-372242, Fax. +31 (0)347-355643, e-mail: info@dewijs-3d.com
