For the past year I've been looking at the 150 f3.5 for my pentax 645,waiting on the right priceand condition when spare money was available. Finally decided on exc grade with caps from keh for $ 104 till I saw one on the bay no bids at 75 including caps . Bid the minimum and won paid sunday and now waiting for it . Now I'm killing myself second guessing wheter saving the $ 30 is worth it and won't know till it gets here saturday or monday . Well at least he has a 14 day return policy if it's not as good as it looked in the ad.