I have for sale the following for the Mamiya RB67 system: Extension Tube # 1 including F&R caps EX condition: $30.00 Extension tube # 2 with F&R caps. Couple minor nicks on barrel. $30.00 Mamiya cable release (shutter & mirror up): $45.00 Polaroid back with P adapter. Name plate is faded. $80.00 I recently bought these as a part of a kit. The extension tubes connect to the body and lens without any problem. The cable release works as it should. I have not tested the Polaroid back but, apart from the fading on the name plate, appears to be in good condition. Payment via PayPal and I will absorb the fees. Shipping within USA is $10.00 per item Priority Mail. Will ship to other countries for actual cost. I'm a little picky about which foreign countries I will ship to so please check with me first. I have very good feed back on FredMiranda.com (graham_martin).