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03-22-2012, 12:46 AM   #1
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K-01 and 50/1.2

Fellow Pentaxians , I am considering buying K-01 so that I can return to shooting with my SMCP A 50/1.2. If any of you has already done so (specifically shooting with f/1.2 lens), I'd like to hear your impressions and/or see the samples, preferably at apertures wider than f/1.8.

Thanks in advance.

03-22-2012, 03:26 AM   #2
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quote
I wonder if the focus peaking is accurate and usable even at f/1.2
03-22-2012, 04:08 AM   #3
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QuoteOriginally posted by befocus Quote
quote
I wonder if the focus peaking is accurate and usable even at f/1.2
Focus peaking works great with my 85mm F1.4 wide open.
03-22-2012, 04:39 AM   #4
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Merci

QuoteOriginally posted by jogiba Quote
Focus peaking works great with my 85mm F1.4 wide open.
Bonjour,

Thanks ... good to know ... and how do you like your 85/1.4, because I'm considering this lens for a future acquisition.

Salut, J Frog

03-22-2012, 06:34 AM   #5
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Sorry no pics on this site available just yet, but here are my general observations based on what I own and also what I've used so far - close to the general range specifications noted above...

In terms of optical quality i've used these four lens'; here's how they rate optically only...

Zeiss 85mm f1.4 manual focus; but besides the manual focus issue - it's optically one of the best lens I've ever used for this size sensor for a non-Leica camera. The 1.4 is quite useful for both lighting conditions and for "throwing out" the depth of field - especially in portraits and in macro. On the other side of the aperature ranges the depth of field is nothing short of perfection. The only single item I'd personally change about this lens - is to have the option of an auto-focus one.

The original posting mentioned the 50mm f1.2... Without researching it further I'm assuming this would be the manual focusing one as well. I've never used it on a K-01, but have used it on film cameras - the LX. I was quite impressed by it and wished that I would have held onto it.

But from what I recall...

The current Pentax 55mm f1.4 would in fact be optically better than the 1.2.

The Sigma 150mm f2.8 marco is better optically at it's focal length, but not quite as good as the 1.2; if that statement is worded correctly?? It's also considered as one of the better Sigma optics.

The Pentax 31mm f1.8 is almost as good as the 1.2
03-22-2012, 07:07 AM   #6
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QuoteOriginally posted by Medium FormatPro Quote
The original posting mentioned the 50mm f1.2... Without researching it further I'm assuming this would be the manual focusing one as well.
That would be true. There are no AF 50/1.2 lenses in K-mount and precious few non-AF!


Steve
03-22-2012, 07:48 AM   #7
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QuoteOriginally posted by stevebrot Quote
That would be true. There are no AF 50/1.2 lenses in K-mount and precious few non-AF!

Steve
There are quite a few MF 50/1.2 lenses knocking about ! I have two, the K50 and the Cosina which I actually prefer for it's unique rendering of OOF specular highlights. Great lenses !

Check out the 'Post your f1.2 only shots' thread here on PF for some wonderful shots.
03-22-2012, 07:51 AM   #8
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There's an A50/1.2 FS in the Marketplace right now.

03-22-2012, 09:23 AM   #9
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QuoteOriginally posted by John Poitiers Quote
Bonjour,

Thanks ... good to know ... and how do you like your 85/1.4, because I'm considering this lens for a future acquisition.

Salut, J Frog
It's the best deal for a fast 85mm today and is sharper wide open @ F1.4 than the Zeiss 85mm F1.4.

QuoteQuote:
Depending on the degree of aperture, the course of the MTF50 is very interesting. Good news to start with: the image at maximum aperture is fully usable since the obtained resolution slightly exceeds 30 lpmm. This result surpasses both the Nikkor and the Zeiss, whose images at maximum aperture were very ‘soft’.
Samyang 85 mm f/1.4 Aspherical IF review - Image resolution - Lenstip.com

Rokinon 85mm F1.4 on *ist DS2 6mp DSLR :


03-22-2012, 09:31 AM   #10
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My K-01 is arriving to me at the end of the month. I have a SMC-A 50mm f1.2 which I'm dying to test focus peaking with. After I have it I'll post a small review and a few pictures. I love taking pictures with it wide open, and I think focus peaking will greatly improve my keep ratio with it.
As Frogfish already said this topic https://www.pentaxforums.com/forums/lens-clubs/74819-post-your-1-2-photos-1-2-only.html is amazing. Last week I think I finally got a picture worthy of it
03-22-2012, 09:40 AM   #11
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QuoteOriginally posted by jogiba Quote
It's the best deal for a fast 85mm today and is sharper wide open @ F1.4 than the Zeiss 85mm F1.4.
That's a great shot ! However I'd definitely dispute any review that calls the Zeiss 85/1.4 'soft' wide open, it most certainly isn't. It is not as sharp as the Samyang/Rokinon at f1.4 but quickly surpasses it by the time you reach f2.0 onwards. Although TBH if you buy a f1.4 lens it's definitely not to use it at f2.8 - f4 onwards ! The Zeiss is a gorgeous lens and is, as you would expect for the money, built like a tank (and that's my one and only criticism of the lens - it's heavy) ! However in the value for money stakes the Samyang/Rokinon/Bower/Vivitar is unsurpassed.
03-22-2012, 10:23 AM   #12
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cheap bastard strikes again

I'll mention a couple Fast Fifties I got last year. The K50/1.2 was US$250, about market rate then. The M42 Sears-Tomioka 55/1.4 was US$2.25 or 111x cheaper. (Actually I sold that one for US$36.50 and kept the one that I got for US$24.50, but why quibble over details?)

DOF of the 50/1.2 and 55/1.4 are nearly identical. How close? I plugged numbers into the DOFmaster: with both on a K20D shooting a subject 10ft away, the 55s DOF is 1.2in (0.01%) thinner! Yes, the Pentax 'renders' better than the Tomioka, has smoother bokeh, etc. My point is that 3rd-party 55/1.4s can offer nearly the performance of mainline 50/1.2s for a fraction of the cost. But hay, it's only money!

As for an 85/1.4: I'm too cheap for that too. Instead I load my FA50/1.4 with a screw-on 1.5x TC, the Sony VCL 1546A that cost me under US$4 shipped. That makes for a 75/1.4 optic, with sharpness and contrast almost imperceptibly downgraded. But 75mm is so much wider than 85mm, right? Wrong. AOV on APS-C of a 75mm is 23 degrees; of an 85mm it's 20 degrees. Three degrees is trivial, the same difference as between 40mm and 43mm. Of course, I could always put the Sony strap-on onto the K50/1.2 for an 83/1.2 optic. Ooh ooh! Samyang can't match that yet.

No, by all means, go buy 50/1.2s and 85/1.5s and other superfast glass. So what if you have to work some overtime to pay for them?

Last edited by RioRico; 03-22-2012 at 10:40 AM.
03-22-2012, 09:42 PM   #13
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QuoteOriginally posted by RioRico Quote
No, by all means, go buy 50/1.2s and 85/1.5s and other superfast glass. So what if you have to work some overtime to pay for them?
Consider this, sir. Being a thread opener I think I have a bit of a say here. The thread was opened with just one purpose - to ask who owns 50/1.2 and K-01 as to how good is manual focus experience. I already own A 50/1.2 and I mentioned few times that it is my all favorite Pentax lens. Now, sir, your "cheap bastards strike again" is truly out of the context here. Especially the conclusion line quoted above.

Naturally you have your opinion which is valid and respected. But in this specific thread, I am afraid it is not the best example of forummanship...
03-23-2012, 05:57 AM   #14
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QuoteOriginally posted by Boris Quote
Consider this, sir. Being a thread opener I think I have a bit of a say here. The thread was opened with just one purpose - to ask who owns 50/1.2 and K-01 as to how good is manual focus experience. I already own A 50/1.2 and I mentioned few times that it is my all favorite Pentax lens. Now, sir, your "cheap bastards strike again" is truly out of the context here. Especially the conclusion line quoted above.

Naturally you have your opinion which is valid and respected. But in this specific thread, I am afraid it is not the best example of forummanship...
What makes you think the 50mm F1.2 A does not MF as well as an 85mm F1.4 A lens ? I guess if none of the 50mm F1.2 A owners gets a K-01 you will not get an answer to your question.
03-23-2012, 10:32 AM   #15
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QuoteOriginally posted by jogiba Quote
What makes you think the 50mm F1.2 A does not MF as well as an 85mm F1.4 A lens ? I guess if none of the 50mm F1.2 A owners gets a K-01 you will not get an answer to your question.
Nothing makes me think so. I don't know and hence I am asking.
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