Scope/DSLR coupler

thingiverse

A mechanical adapter to link a DSLR camera to a spotting scope (digiscoping) is devised. This adapter essentially consists of a cylinder with three internal diameters. The scope employed is an Olivon 65mm, while the camera used is a Canon 350D. The design can be easily modified to accommodate other scopes and cameras. A T2 adapter purchased online is utilized. To connect the camera to the coupler, the camera lens must be replaced with the T2 adapter (machined from aluminum). One end of the coupler attaches securely to the scope eyepiece via a tight interference fit, allowing the scope to function normally. When capturing a photo, the camera is attached to the coupler via the T2 adapter (a snug sliding fit). This adapter can be easily printed using basic materials and tools. However, determining the optimal internal diameters and lengths requires printing test objects. Despite its simplicity, the adapter poses challenges in two areas: mechanical and optical. Mechanically, the weight of the camera causes the scope eyepiece to droop, making it difficult to maintain a stable position. Over-tightening the tripod tilt mechanism is not a viable solution. A possible alternative could be adding a counterweight on the far end of the scope; however, this would add extra equipment to carry. Optically, the camera's auto settings consistently produce overexposed images due to the lack of aperture adjustment options (the camera's lens is not removable). To compensate, manual adjustments via shutter speed or setting are necessary. Evaluating results from the LCD screen can be challenging outdoors, especially when judging exposure levels. Much remains to be learned about optimizing this setup for bird photography; however, the coupler itself is a straightforward object to manufacture.