GuerillaBeam slide holder

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GuerillaBeam is a versatile image projector system consisting of interchangeable modules, including a slide holder, an attached photo lens, and high-intensity light source. The light module is typically adapted from a Cree XM-L flashlight, but other strobe lights or similar devices can be used as alternatives. What to Expect: The GuerillaBeam projector produces images with brightness comparable to 100-watt conventional projectors, projecting slides of up to 2 mm thickness over a range of 1-150 meters. The image quality is high enough to outperform digital projectors, offering significantly higher resolution and better clarity. Compatible Devices: GuerillaBeam can be integrated with various SLR camera lenses from manufacturers like Canon, Nikon, and Pentax. Additionally, it is compatible with photo projector lenses featuring standard tube diameters of 42, 52, and 62 mm, as well as high-power LED flashlights and other similar devices. How to Make: To create a GuerillaBeam system, determine the thickness of your 35mm slide mounts first. There are two versions available: one for slides with up to 2.00 mm thickness (e.g., Agfa CS) and another for thicker slides up to 2.5 mm. Custom sizes can be requested. 1. Printing the Slide Holder: Print the slide holder using a 3D printer, ensuring a wall thickness of at least 0.8 mm and a layer height of less than 0.2 mm. This will provide sufficient support for lenses weighing up to 2 kg. A recommended infill percentage is 23%, but this can be set to zero with greater wall strengths. For FDM printers, print the slide holder with support material to ensure proper fitment. Automatic support generation in Cura usually works well for overhangs exceeding 51%. Manual placement of support material may be necessary with other slicers. 2. Installing a Condenser Lens: To function as intended, GuerillaBeam requires condenser lenses or it will only project a reduced image area (typically a 20 mm circle) with lower brightness. A simple way to obtain suitable lenses is by using credit card magnifier lenses, cutting them to size (38x48 mm), and carefully placing them into the corresponding slots. A single lens with around 100 mm focal length (10 dpt power) usually works well, but experimenting with other lens values may be beneficial. Suitable photo lenses feature an f-number of 2.8 or less, provided there's an adapter available. Slower lenses will work too, but only with significantly reduced brightness and image quality. Recommended focal lengths range from 50 mm (most powerful, lightweight, and affordable) to 200 mm (long-range, but costly at f/2.8). Slides: Common classic photo slides of 50 by 50 mm size with thicknesses up to 2 mm can be used. Professional photo lab slides are ideal, but printing on overhead transparencies is a reasonable alternative, despite inferior slide quality. This method is usually sufficient and quick.