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08-23-2013, 01:10 AM   #1
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"Manual" AF fine adjustment of FA 50 1.4 on the 1.4 end

Is it possible to image sharpen my FA50mm 1.4 on the 1.4 end of the aperture using the built-in AF fine adjustment of my K30?
I really like low light pics and this 1.4 is nice but soft. Help. THanks!
I hope you guys know what I mean.

08-23-2013, 01:15 AM   #2
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AF adjustments don't sharpen the image, they just help ensure that the focus readings the camera makes are correct. The DOF is very thin at F1.4, and the IQ isn't as good as when stopped down, so you should expect a bit of softness. Use it to your advantage!

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08-23-2013, 02:50 AM   #3
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QuoteOriginally posted by Iksobarg Quote
I really like low light pics and this 1.4 is nice but soft.
My experiences with my copy: The softness isn't as much due to "unsharpness" as to low contrast. Thus, try to increase constrast:

08-23-2013, 04:28 AM   #4
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Tack sharp@1.4 (wide open)? Is there sush thing?

1. Is there such thing as a tack sharp at 1.4 or 1.2?
2. Is there a lens that is tack sharp wide open? I know I've read reviews and comments from some owners' claims of sharp wide open.
Anyway, I understand the dof effect/ratio, which is definitely at times pleasing. To me the softness is an acquired taste... I'll work on it.

I visited the ltd club thread and was impressed!
However I have trouble justifying $500+ for a ltd at the moment.

Many thanks!


Last edited by Iksobarg; 08-23-2013 at 04:44 AM. Reason: correction/clarification of my point
08-23-2013, 05:39 AM   #5
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QuoteOriginally posted by Iksobarg Quote
1. Is there such thing as a tack sharp at 1.4 or 1.2?
2. Is there a lens that is tack sharp wide open? I know I've read reviews and comments from some owners' claims of sharp wide open.
Anyway, I understand the dof effect/ratio, which is definitely at times pleasing. To me the softness is an acquired taste... I'll work on it.

I visited the ltd club thread and was impressed!
However I have trouble justifying $500+ for a ltd at the moment.

Many thanks!
The Sigma 35mm f/1.4 Art lens is very sharp wide open. Expensive but very sharp at 1.4.
08-23-2013, 10:08 AM   #6
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Use a deep hood!
08-24-2013, 11:57 AM   #7
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Soz, I do not understand deep hood.(?)
Well considering I have two, yes two FA50/1.4s, what do my Pentaxians recommend as best replacement?
I looked around and the limited 43mm/1.9 (?) or someone recommended the Sigma art 35 (too wide for me
Any others? I know I'm missing some options.
Wait, I know, the da55/1.4? I read really rave reviews.
Then there's the ka50/1.2 but I prefer af.
I really need/want sharp@wide open at the widest possible aperture.
As always thank you.

Last edited by Iksobarg; 08-24-2013 at 12:08 PM.
08-25-2013, 02:49 PM   #8
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Ok. I did some research and have concluded that this is the right fifty for me:
Sigma 50mm F1.4 EX DG HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database
I also checked dpreview on this sigma and am a little blown away by how generally disappointing the DA55/1.4s AF is.
That aside at least one of my FA50s is gonna find a new home.
Thank you Pentaxforums!

08-25-2013, 06:19 PM   #9
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QuoteOriginally posted by Iksobarg Quote
Ok. I did some research and have concluded that this is the right fifty for me: Sigma 50mm F1.4 EX DG HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database I also checked dpreview on this sigma and am a little blown away by how generally disappointing the DA55/1.4s AF is.
Compare the 2 lenses:

Pentax (FA 50/1.4)
65x37mm = Vol. 122 cm^3
Filter 49mm
Weight 220g
18.8 cm^2 Filter area

Sigma
84.5x68.2mm = Vol. 377 cm^3
Filter 77mm
Weight 505g
46,5 cm^2 Filter area

So the Sigma has more than 3x the volume and more than 2x the weight of the Pentax, and needs a filter with nearly 2.5x the glass area. It shouldn't be too difficult to offer a lens with the IQ of the Sigma, if you have absolutely NO restriction in respect to size and weight.

If you have a look at specifications, you will find similar relations for many of the Sigma primes. Lens design seems to be much easier if you have no restrictions on filter size. Bigger volume and higher weight then will follow automatically.

Last edited by RKKS08; 08-25-2013 at 07:25 PM. Reason: Errors corrected
08-26-2013, 12:34 AM   #10
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'great taste, less filling"

Thanks for added analysis RKKS08.
Great supportive reasoning to keep one of my FA50/1.4s.
I've truly handpicked this Sigma 50/1.4 from the crowd.
Main cause was the DA55/1.4s price tag.
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