![]() Inside you can reproduce the whole Divine Comedy with paraphrases and exegesis (I don’t know, however, how much it will serve you for a Christmas screening).įocal length of the lens and ID of the gobo contribute to determining the aperture angle. Telephoto lenses with focal length between mm (I wrote to you that we have it …)įor example, a projector at 20 meters with 100mm optics creates an image of 9 meters in diameterīy changing only the optics, with the same ID, and using a wide-angle lens for example 56mm, you get an image of 16 meters in diameter. Normal optics with length between 50 and 70 mm Wide-angle lenses with focal length up to 45mm The shorter the length, the more the lens “opens” the beam. And we also have the ones we see in the next point.Īttention: the size of the projected image is not only related to the projection distance but also to the size of the gobo (ID) and the projector lens.Ī lens is characterized by the focal length expressed in mm. Over 100 meters, special optics (telephoto lenses) are required. Below 10 meters the number of projectors needed to cover the surface will be very high. But you can have the best: For most Christmas projection installations, the optimal distance is between 20 and 100 meters. On the other hand, it must be borne in mind that the larger the image, the less concentrated the light will be. The farther the projector is, the larger the image I get. ![]() We take into account the extreme principles: the size of the image is directly proportional to the projection distance. It is not always possible to position the projector in the most suitable point and often the positioning is constrained by various factors such as the space available or the position of the poles on which the projector can be installed. It is the distance between the projector gobo and the surface to be illuminated. Alternatively, there are adhesive films on the market to be applied to the glass that reduce its transparency and thus allow projection. You can also light up the Crystal Palace in Madrid. ![]() Closed shutters or a good curtain placed behind the transparent surface are enough and that’s it. For this reason, the image projected by the gobo will not be visible on a glass or window. But if that’s your intent, you don’t need Christmas gobos. The ones that are not good are mirrored or high-reflectivity surfaces unless you want to flash your potential guests. But the yield is better on light and regular surfaces. Suitable surfaces and surfaces unsuitable for projectionĪll masonry or wooden surfaces are suitable for the projection of gobos, no matter the color. If you ask us to illuminate the mythical octagonal Castel del Monte, let’s talk about it in time … Gobo projection can also affect multiple sides of a building, or multiple buildings. The first thing to clarify is the size of the surface to be illuminated: both in height and in length. Let’s see how Christmas projections of great scenic effect can be obtained that meet different expectations with the use of gobo projectors. In recent years, the tendency to illuminate the facades of municipalities, churches, shopping centers, industrial buildings and even private homes with effects and suggestions of colored and moving lights during the Christmas period has become increasingly widespread.īut what’s behind Christmas projections of great scenic effect? A few tricks and the right gobo-projectors. ![]() Would you like to make a Christmas projection on the outside wall of a building but have no idea what is needed? Goboservice offers a short guide to provide the key concepts needed to make a correct choice.
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