Based on this forum post.

"If, based on the purchase price we determine, more than $15,000,000 in value of shares are properly tendered and not properly withdrawn, we will purchase all shares tendered at or below the purchase price on a pro rata basis, except for “odd lots” (lots of less than 100 shares), which we will purchase on a priority basis (though tenders of less than all of the shares owned by an “odd lot” holder will not qualify for this priority)," Source: Tender Offer Statement 6/30/2008

Preliminary Results: CyberOptics expects to accept for payment 1,500,000 shares of its common stock, or approximately 18.3% of its outstanding shares at July 29, 2008, at a purchase price of $10.00 per share. Based on the preliminary count, an aggregate of 1,590,228 shares were properly tendered and not withdrawn at a price of $10.00 or less, including approximately 33,685 shares that were tendered through notice of guaranteed delivery.