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04-19-2010, 08:34 AM   #16
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The impression I got before mine was pinched was that f/1.2 was perfectly useable if I got the focus spot-on, and that's a big if. Stop down one click and the contrast in the detail improved dramatically - a bit like the f/1.4 in that respect. It wasn't so much that f/1.2 was soft, more that with high contrast edges the white would bleed into adjacent dark areas with a kind of glow. The trick was to avoid high-contrast highlights. My K105 f/2.8 is very similar wide open in that respect, and both lens suffer a bit from longitudinal CA with highlights (red in front of, green behind, the plane of focus). It was a great lens though.

Tim

04-19-2010, 10:16 PM   #17
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QuoteOriginally posted by rparmar Quote
That could be, but I'm not likely to get it any more in focus. I do think it is down to the subject. Being a print of a woodcut, this has highly contrasting lines placed closely together. It is probably a worst-case scenario. Some subjects show this aberration more than others. See the cat photo where it is just not a problem!

The K55/1.8 is a lens I would love to have to compare with this.
Since timo mentioned that this lens suffers from some longitudinal CA (many ultra-fast lenses have this problem), the purple edges could just indicate that your shot was very slightly back-focused.

Anyways, thanks for the detailed writeup of this interesting lens.
04-20-2010, 07:15 AM   #18
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QuoteOriginally posted by timo Quote
The impression I got before mine was pinched was that f/1.2 was perfectly useable if I got the focus spot-on, and that's a big if. Stop down one click and the contrast in the detail improved dramatically - a bit like the f/1.4 in that respect. It wasn't so much that f/1.2 was soft, more that with high contrast edges the white would bleed into adjacent dark areas with a kind of glow. The trick was to avoid high-contrast highlights.
Tim, that is an exact description of my experience. Well said!

QuoteOriginally posted by photogerald Quote
Since timo mentioned that this lens suffers from some longitudinal CA (many ultra-fast lenses have this problem), the purple edges could just indicate that your shot was very slightly back-focused.
I shot several and took the crispest one. But yes, this could still be a case of operator error.

QuoteOriginally posted by Jimfear Quote
I'll contribute with another real world example, plus a crop for the pixel-peepers.
Thanks everyone for their contributions. This sort of thread would have helped me in my purchase decision. I do hope it helps others.
04-22-2010, 05:19 AM   #19
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real life shot at f1.2

Here is one street shot at f1.2:



10-29-2010, 03:29 PM   #20
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I'm just about to have delivery of one of these. It should be a fun exercise to work with it.
10-29-2010, 04:47 PM   #21
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Im with axl, mine shows absolutely zero PF..... it has a bit of red fringing but thats about it. I've actually been EXTREMELY impressed by how little fringing it displays for being F/1.2
10-30-2010, 12:16 AM   #22
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can't wait for my to be fixed.... Really miss this lens.. I've tried 43/77 combo on my holiday as a replacement but it doesn't work... I might even be selling those two in favor of 50/1.2
10-30-2010, 12:21 AM   #23
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QuoteOriginally posted by axl Quote
can't wait for my to be fixed.... Really miss this lens.. I've tried 43/77 combo on my holiday as a replacement but it doesn't work... I might even be selling those two in favor of 50/1.2
And I remember not long ago you just about to sell it.... and I told you not to

10-30-2010, 12:36 AM   #24
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QuoteOriginally posted by yeatzee Quote
And I remember not long ago you just about to sell it.... and I told you not to
as much as I don't like to admit it: YOU WERE RIGHT

by now I think, it's optically the best lens I've shot! It kills 43 and pairs nicely with 31....77? I just don't use it so much...
10-30-2010, 01:29 AM   #25
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QuoteOriginally posted by axl Quote
as much as I don't like to admit it: YOU WERE RIGHTby now I think, it's optically the best lens I've shot! It kills 43 and pairs nicely with 31....77? I just don't use it so much...
Oh how I love that
10-31-2010, 12:25 PM   #26
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I have now sold my K50/1.2 with some regret. Financial pressures. For me keeping FA43/77 combo makes more sense, since they are smaller and cover a wider focal range.

On the upside, Robbie from this forum now has a lovely new toy to play with!
10-31-2010, 12:39 PM   #27
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funny enough Robin, I've been thinking of doing exactly the opposite way! For me it's all about OOF. And 50/1.2 just blows 43 off the water. It matches perfectly with 31. 77 fit's the line up but it's tad too long for me.... I'll see...
10-31-2010, 12:44 PM   #28
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But over $600 on fleabay for a A 50 1.2, I think I would rather spend that on a new F-DA 100 2.8 WR.
10-31-2010, 12:48 PM   #29
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How about a Brand New one.
Brand New Pentax smc A 50mm F1.2 Lens MF K-7 LX MX MZ - eBay (item 180570083156 end time Nov-02-10 19:20:22 PDT)
10-31-2010, 01:40 PM   #30
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QuoteOriginally posted by Fl_Gulfer Quote
But over $600 on fleabay for a A 50 1.2, I think I would rather spend that on a new F-DA 100 2.8 WR.
I think you are kidding here...
Have you shot K or A 50/1.2?
Even the MF K series destroys anything (and I mean ANYTHING) in it's way IQ wise!!!
But then again I think it's about priorities, if you need WR 100 ish lens than fine...
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