Prime lenses have a fixed focal length: you cannot zoom. Higher numbered lenses have less distortion but are also much more expensive. ![]() Do not use fisheye or wide-angle lenses because they cause too much distortion. The wider a lens (lower mm number), the more you are able to capture in a photo, however with a 24 mm lens or lower you’ll start to see distortion around at the edges of your frame. Lenses are measured based on focal length (the number before the mm on your lens). If you plan to use photogrammetry to record quantitative data, a DSLR camera is required. This doesn’t mean you can’t do photogrammetry with a point-and-shoot or your phone’s camera, but the quality will be that much better if you use a good DSLR camera. The goal is to have a set of the clearest photos possible, which means using a camera and lens that have a manual mode where you can adjust the camera’s aperture, focus, white balance, and ISO to fit your lighting environment. Photogrammetry, at its core, is a photographic project. Step 1: Equipment choice and setting up your photo station Equipment ![]() If you want to create a quick and less accurate model or you are working in the field or with a collection where you can’t bring the physical object to Clemons, check out my posting on photogrammetry in the field with your smart phone. ![]() In this blog posting I go through the workflow to create a high quality, scaled model using our photogrammetry station in the Robertson Media Center on the third floor of Clemons Library and computer software called Agisoft Metashape (previously Photoscan). your pet hamster or your best friend’s head). Light is critical to this process and therefore there are certain objects that are difficult, if not impossible, to model using photogrammetry: objects with reflective or shiny surfaces, clear/transparent objects like glass, very thin objects like tree leaves, very furry or hairy things, things that move (e.g. Basically, you take a bunch of pictures at different angles of an object, run all the photos through a computer program called Metashape, and you end up with a very cool digital 3D object at the end! The Smithsonian 3D Digitization has a whole collection of 3D models online you can browse from artifacts to structures to in-situ burials. What is Photogrammetry? Photogrammetry is a photographic process that generates 3D data (measurements) from 2D images (photographs) to create a 3D model with accurate color and texture.
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