Originally posted by northcoastgreg Some of the rise in lens prices can be blamed on sites like this one, which propagate information about Pentax lenses. All those posters who wax enthusiastic about this or that vintage lens drive up demand, and hence price. After all, we're not seeing prices rising on the M 50/2 or M 28/2.8, because, while those lenses have their partisans, they have also have their detractors. But prices are being pushed up on lenses that are almost universally praised, such as the K 35/3.5 and the A 35-105/3.5. A year and a half ago a K 35/3.5 sold for $180 on ebay, which is about the price of a brand new DA 35/2.4! The K 35/3.5 receives a rating of 9.72 over at the PF review section, one of the highest ratings for a non-speciality, non-star manual focus prime lens. I suspect the high rating had something to do with that price.
These ratings are not just current opinion. These lenses have been rated that way for decades, literally. In the late 80's there was a survey of Pentax users on a List-Serve call PDML. Our ratings are consistent with that survey. Go
here to see a summary of those ratings.
The K35/3.5 has actually come down in price the last 10 years from $225 to the current $149 - $189 depending on the day. Same with the K28/3.5. Those are two of the sharpest
common MF Pentax lenses ever made (not a K28/2, for instance) and the 35 is still considered one of the very best in color rendering. It is currently a steal. But the general vintage lens prices are closely correltated to the stock market - really, I watch this stuff.
A few other less easy to find K lenses are demanding premiums.
This ebay seller always seems to have several nice lenses in his store. He is a member here and was one of the PDML guys back in the day. Look at the the prices of the 105/2.8 and 120/2.8 - that's because you don't see either on an every day basis. Supply and Demand.
The K24/2.8 has held its value well in the $229-$269 area. The lens where I've seen the most rapid recent change is the K105/2.8, which has gone up something like $80 in the last twelve months. ANY 85mm lens is impossible (even the M85/2). The 50's (K/M/A 1.4/1.7) seem to be fairly steady, in part because they are readily available - the same holds true for the lenses you used as examples. In the 13 years I've been an ebay member I don't think the M28/2.8 has moved up or down $10. Hundreds of thousands of the M50/2 were manufactured. The K55/1.8 is a bit weak recently - there's a nice one with 21 hours to go bid $15 a/o 11:30 this evening.
Takumars are positively insane. I 2x'ed my money on eBay in 6 months last year on a S-M-C 105/2.8 that I never even got to use. That money is now in the DA40Ltd. I only have one Tak left.
If you'd like to see the average ebay, KEH and Adorama Completed Listing prices for
every sale of
every vintage Pentax lens from 2002 - 2004, including the 2004 ratings of each, download
this pdf..