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07-22-2013, 07:53 PM   #1
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K50 f/1.2 vs. A50 f/1.2, help

I think that I'll be able to get a K50 f/1.2 after ironically declaring a month ago that I've got my LBA under control now (and oh, it's just a little relapse).

Anyway, for those really lucky guys who have both of these glasses, if I get the K, should I still be really looking out for an A? Is the price difference between the two really worth it, if I'm not really after the A-setting? I mean, I'm getting it for the f/1.2 after all, and not for the A-setting.

Thanks.

07-22-2013, 08:06 PM   #2
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Do you mind having to stop down meter all the time? If so, then you might want to consider the a lens.

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07-22-2013, 08:23 PM   #3
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I absolutely loved the K50 I had. Easy to work with and it provided fantastic results. I wouldn't have given mine up if it weren't for a busted computer, but it's alright in the end. If you can get a good deal on it, go for it.
07-22-2013, 09:54 PM   #4
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Either

I have both. Optically i do not see any difference between the two. Mechanically they are both beefy and solid. Focus rings have similar friction. You win either choice that you use.

07-23-2013, 04:29 AM   #5
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The A setting is not just for auto aperture but also for flash shots, but if getting it only for F1.2 then it does not matter. I suspect that you would enjoy the K better because they just seem to have a better build quality or at least more substantial feel, than A lenses
07-23-2013, 06:42 AM - 2 Likes   #6
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There is no discernible difference in build between the K and the A. The A seems to be built to higher tolerances than the rest of the series, A*'s excepted. Rparmar and myself performed a non scientific shootout between some f/1.2's recently and to us there was nothing in it optically between images returned. A good K will outshine an average A and vis versa. Usability wise the A is better in than it is more tightly integrated into the camera's operation and has the granularity of 1/3 stops over the K's 1/2 stops.
07-23-2013, 06:33 PM   #7
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Thanks, all.

So, optically, there's no difference between the two, it's good to know I can save a few dollars.

Lowell, yup, I tend to be partial to K and M mount because of their classic build.
07-24-2013, 05:19 AM   #8
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One other minor difference that I don't think has been mentioned is the A has 9 aperture blades and the K has 8.

07-24-2013, 07:57 AM - 1 Like   #9
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Just pick one. they are BOTH superb lenses, and are a real joy to work with.

QuoteOriginally posted by nater Quote
One other minor difference that I don't think has been mentioned is the A has 9 aperture blades and the K has 8.
which has zero impact on image quality at f/1.2:


Pentax K5IIs - Pentax SMCP-K 50mm f/1.2 @ f/1.2


Pentax K5IIs - Pentax SMCP-K 50mm f/1.2 @ f/5.6
07-24-2013, 02:31 PM - 1 Like   #10
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QuoteOriginally posted by Digitalis Quote
Just pick one. they are BOTH superb lenses, and are a real joy to work with.
+1 on that, I kept my "A" version purely for it's ease of use, IQ wise I couldn't really see difference for my style of photography between the two.
07-26-2013, 10:36 AM   #11
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The K-50 also functions as macro imo.
A-50 is great for ease of use but doesnt do macro.
07-26-2013, 07:58 PM   #12
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QuoteOriginally posted by Norman Quote
The K-50 also functions as macro imo. A-50 is great for ease of use but doesnt do macro.
I wouldn't use either the K 50mm f/1.2 or the A 50mm f/1.2 with extension tubes - their focus fields aren't anywhere near flat enough. For this purpose I would recommend a dedicated Macro lens. Though, the K55mm f/1.8 isn't bad at all when used with extension tubes.
07-27-2013, 11:42 PM   #13
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QuoteOriginally posted by Digitalis Quote
I wouldn't use either the K 50mm f/1.2 or the A 50mm f/1.2 with extension tubes -
Agreed, but I make the exception for fun experiments:
08-06-2013, 03:02 AM   #14
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QuoteOriginally posted by Digitalis Quote
Just pick one. they are BOTH superb lenses, and are a real joy to work with.
which has zero impact on image quality at f/1.2:
Thanks, Digitalis, you're really very helpful. That second picture is worthy of a frame.

The seller has been dilly-dallying as to whether he wants to sell his k50/1.2. And I'm still courting the guy! Darn!

In the meantime, I just bought a Pentax M 50/4 macro. It should arrive by Friday or Saturday. I didn't exactly know why I bought it. All I know is that it should be sharp, has zero distortion, and is not a macro in its truest sense. I already have the DFA100WR. And I already have a lot of 50s.

Honestly, what's the best use for this lens? Got it at a fair price of $90.
08-06-2013, 05:12 AM   #15
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QuoteOriginally posted by drypenn Quote
Honestly, what's the best use for this lens? Got it at a fair price of $90.
Pretty good performer reversed on a bellows if you want to go extreme macro.
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