[harv3589]

The other ones I found the guy has the Pentax SMC-M 1:2.8 28mm and the Pentax SMC-M 1:1.7 50mm for $150...also includes an old 35mm Pentax camera and flash, but I am after the lens.

[benjikan]

I can't find very much info on this lens, how is the quality? Good - bad for use on a K10D?

SMC Pentax 1.2 50mm

SMC Pentax-M 1:1.7 50mm

SMC Pentax-M 1:2.8 28mm

And what are they selling for?

Thanks,
Rob

I have both the new 1.4 50 AF Pentax and the older manual focus 50 mm f2.0 the first on your list. It is a very nice lens. Here are some samples.

[WendyB]

I always check here for "fair market" prices:

KEH Camera: Used Cameras, Digital Cameras, Film Cameras, Laptop Computers and More.

Thanks never knew about KEH,

Another link where I found relatively good info on second hand pricing,

Some 2nd-hand prices - Primes: Pentax SLR Talk Forum: Digital Photography Review Primes

Re: Some 2nd-hand prices - Zooms: Pentax SLR Talk Forum: Digital Photography Review Zooms

Just looked at a few quotes on a few lenses I have at KEH especially on a rare lens recently bought at an estate sale a SMC PENTAX F ★300mm/F4.5 ED [IF] they only offered $352.00 in like new condition, that is quite a major bit shy of what it is worth. I would never sell this lens I have been looking for one for years.
Then I just saw what this lens is being sold for at the first link (primes), If that can be done at $6,000 plus I just may have to consider parting with this lens, that buys a lot lot of equipment. (you would line me up at a firing squad if you knew what I paid for it)
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/16317-any-one-...3-5-4-5-a.html

They were a bit off spot for an SMC F 50 1.7 like new condition $86.00. This lens sells in the 125 to 225 dollar range on eBay. This offer would be taken in a real pinch

and the SMC F 35-135 F3.5-4.5 MACRO Like new $64.00.This lens sells in the 95 to 115 dollar range on eBay. So this offer would do in a pinch