It's a click fit over the EP and there's a fibre washer inside the tube to align the camera lens which I drilled out to exit pupil size - it's held onto the scope by talented use of elastic bands and can be removed as a unit (this means you can focus using another lens and place this one straight on the system) - however if the camera has a self off timer, it has a tendency to collapse the lens and drop off the OTA so make sure you tether it!
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