Tamron Adaptall 2 SP 70-210mm 1:3.5 CF Macro BBAR MC 19ah M42 Pentax Screw AF mechanism: NON-AF Zoom lens type (new): Telephoto zoom lens Interchangeable lens type: Zoom lens Special lens type: Non-special lens It seems to have been used with professional SLR cameras, but I am a novice, so I do not know the details. All the information was searched on Google, and the above explanation came out. I don't know if it's correct, but please judge from the photos. Please understand that this is a used item. If you are looking for a new or complete product, or if you have strong preferences, please refrain from purchasing. The physical condition and exterior can be judged from the images. Since there is no environment to check the operating condition and functions of this product, the operation is unconfirmed and it is treated as a junk item. It has been stored for a long time for collection purposes, and I have not tried putting in batteries. I don't know if it works. Please use it as a junk item (assuming it does not work or is defective).