Originally posted by shardulm 1. 50/1.7 any version is good, should be $50 or under. (The M and A versions are a pleasure to use. F and FA aren't so much cos they AF and that is the pleasure area in A and Ms besides image quality and they may more than a 100 bucks cos they AF).
2. 55/1.8,2.0 may be slightly rarer than the 50/1.7 above and isn't going to be cheap (MF pleasure, but should find one in the ball park of $100)
3. 50/f2 underrated for a reason. Its soft but very cheap (MF pleasure, Sharpness suffers until stopped down and by quiet a few stops actually but dirt cheap on the used market probably cheapest of the lot).
1. There was no K 50/1.7, so that lens is moot to this discussion.
2. Plenty of 55/1.8s for less than $100. I wouldn't pay more than $50-60 for a 1.8 or $30-40 for a 2 (Unless it is attached to a camera). I see them on shopgoodwill all the time. Not as common as Taks or M series, but still available. (There is a KX with a 55/1.8 currently at $51)
3. M series lenses are moot to this discussion.
My K 50/1.4 & K 55/2 came from shopgoodwill attached to K1000s. I know I didn't pay $100 for either one. I did pay $60 for a 55/1.8 on eBay...