OTA is 1000mm f/9.8. I am second owner - the original owner almost never used it. I have only used it a few times - still in very nice condition. Comes with 1.25" diagonal and 9mm plossl, and I have the original manual. It works great on the included CG4 mount. The scope is fully assembled and balanced on the mount - buyer must pick the scope up in person (would not be cost efficient to disassemble/ship). $275 firm - this is somewhat under the market, to facilitate a quick sale. I am located in Torrance, CA.