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SMC Asahi Pentax Camera 7040385 Lens 1204911 N Flash N Bag N Camera Cover 35mm | eBay

The poster has no idea what he has.

Six hours left, 13 bids, price so far $67.

[MegaPower]

The ending price is very good.
Had the K50/1.2 but sold it.

I don't find f/1.2 is brighter than f1.4 at night.

[mike.hiran]

I had one for about a year. I had a Buy/Try/Sell fetish where I wanted to have every legendary Pentax MF lens I could never afford when they were new, at least have them for a while, so I would know I had. I sold it because I didn't want to have that much money tied up in one lens. It was either only the K50/1.2 or no K50/1.2 and many other 50's.

IMHO (and I will likely attract contrary opinion here) the f/1.2 merely allows you a slightly thinner DoF (@10ft on 35mm film, 0.86 feet vs. 1.02 ft for f/1.4), so your subject can be slightly closer to OOF foreground and background elements and thus achieve isolation or the 3D effect in more settings (closer to backgrounds, for instance). In my case it was very difficult to achieve necessary critical focus in an APSc viewfinder (because I have old eyes and an eye disease), where you only get a tiny bit more than 6" of DoF with either lens at 10 ft. At 5 ft you get about an inch with both lenses, so it is really neither easier nor harder to use the f/1.2 lens than the f/1.4.

On APSc I thought the CoC was so thin wide open (0.02mm) that it wasn't really useable. I'm sure the lens was better in this regard on 135 film. I tend to do my best with bokeh at f/5.6, which is also where most of my lenses get really good. At 10 feet @ f/5.6 you get about 2.75 ft APSc and 4.25ft 135. The standard I was taught is:

• 100mm lens, 10 feet @ f/5.6 on 135 = 1 foot DoF

The actual quality of the OOF highlights is more the result of the specific lens design, the glass and the number of aperture leaves, whatever the largest aperture of the lens.

I still believe the real advantage of the f/1.2 lenses is low light focusing.

Personally, I find the real draw to the 1.2's are how they render things. They just have a different look to them, almost dreamy and others have called them painterly. I have 1.4's also, but I do like the unique look of the 1.2's.
Others have also noted that a 1.2 shot at 1.4 will be sharper than a 1.4 at 1.4 or even at 2.0. So if you need to shoot with a wide aperture like 1.4, a 1.2 could give you results that are more in line with what the photographer wants.

Here's the 1.2 lens club thread which has some great shots from the Pentax as well as the Cosinas:
https://www.pentaxforums.com/forums/lens-clubs/74819-post-your-1-2-photos-1-2-only.html

[Kerrowdown]

If f/1.2 has such huge merits

The fact your asking, I guessing you don't own one.

There is just something about them, if you get a chance to handle one at some point, you'll hopefully see what I mean.

[yusuf]

What is so big deal about f/1.2? You can get f/1.4 much cheaper (K version). Only difference being in the bokeh effect, would this f/1.2 be so much better than currently available AF/1.4?
If f/1.2 has such huge merits why is Pentax not releasing a newer version?

Mostly bragging rights!!!

[top-quark]

The ending price is very good.
Had the K50/1.2 but sold it.

I don't find f/1.2 is brighter than f1.4 at night.

This may explain why:
DxOMark - F-stop blues

[Eyewanders]

Was this genuinely an F/1.2 or was it just an F/2 as originally posted? If the former, that really was quite the deal. I missed this entirely.

[monochrome]

The (very dark) photo of the beauty ring showed it is a SMC Pentax 1:1.2 50mm. Seller never mentioned the actual lens description anywhere in the title or text.

[Checking...jono]

The (very dark) photo of the beauty ring showed it is a SMC Pentax 1:1.2 50mm. Seller never mentioned the actual lens description anywhere in the title or text.

I have picked up a bargain or two because of that.

[Docrwm]

You did the seller a big favor by posting that link here.