Mamiya rb67 instax square film back. Production will start after payment, because it is the scheduled production method, no refund will be received, production cycle less than one week, this price include one modified instax back ，two film dark slide, short one for shoot,long one for remove. We use 3D-Scan to design this instax back, so the focal plane is very accurate, it can focus on infinity. We separate the on-and-off button from the shutter button，so long exposure and multiple is very easy. You only need to prepare two cr2 battery. Feel free to ask queation.i will ship it use air mail.