To select the appropriate sleeve size  you need to fold back the rubber eye cup or remove it if possible and measure across the the eyepiece. Please choose the next size up to your eyepiece actual measurements.

37mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 37mm

40mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 40mm

42mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 42mm

44mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 44mm

46mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 46mm

47mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 47mm

48mm diameter eypiece sleeve for eyepieces with maximum diameter of 48mm

50.5mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 50.5mm

52mm diameter eyepiece sleeve for eyepieces with maximum diameter of 52mm

53.5mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 53.5mm

57mm diameter eyepiece sleeve For eyepieces with a maximum diameter of 57mm

Additional threaded inserts Use a camera with a different accessory thread, or use a digital SLR camera body (T2 mount also required)