Vortex Optics Digital Camera Adapters Connect the viper spotting scope to a dslr camera body with a fixed 50mm lens. The 50mm lens of most digital cameras has a 52mm thread, but you will need to choose the specific Adapter ring that fits the threads of your dslr camera lens Connect the viper spotting scope to a dslr camera body with a fixed 50mm lens. The 50mm lens of most digital cameras has a 52mm thread, but you will need to choose the specific Adapter ring that fits the threads of your dslr camera lens Connect the viper spotting scope to a dslr camera body with a fixed 50mm lens. The 50mm lens of most digital cameras has a 52mm thread, but you will need to choose the specific Adapter ring that fits the threads of your dslr camera lens Connect the viper spotting scope to a dslr camera body with a fixed 50mm lens. The 50mm lens of most digital cameras has a 52mm thread, but you will need to choose the specific Adapter ring that fits the threads of your dslr camera lens Connect the viper spotting scope to a dslr camera body with a fixed 50mm lens. The 50mm lens of most digital cameras has a 52mm thread, but you will need to choose the specific Adapter ring that fits the threads of your dslr camera lens