QHY Canon EF to M42 Lens Adapter - 10 mm - 20072 ND8 Field Stop with 2" Barrel:

Field Stop with 2" Barrel:  38mm for 31

a Dovetail Plate

Despite its large 85 mm objective lens

WiFi is included Polar Align Assist No Auto Guide Yes Permanent Periodic Correction No Dual Encoders No DSLR Interface Yes Included Weights Yes Motor Type Servo Drive System Gear

QHY Canon EF to M42 Lens Adapter - 10 mm - 20072 ND8 Field Stop with 2" Barrel:The QHYCCD Canon EF EOS Lens Adapter has an M42*0. 75 MALE thread on one side and a Canon EF lens mount on the other. It takes up 10mm of optical length. This lens adapter allows you to mount a Canon EF lens on a QHY cooled CMOS camera as well as other adapters or accessories with M42 FEMALE threads.