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06-01-2010, 06:54 PM   #46
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As Marc said, several options are more than sharp enough when shooting at the most commonly used WA apertures, f/5.6 --> f/11. The win for across-the-frame sharpness all apertures considered is going to be the DA 12-24, by a nose, (copy variation aside,) but at f/8, you pretty much have to pixel-peep or print the corners large to see a difference. You should pick a WA lens based on a number of features, weighting them in importance to you and your intended application:

(in no particular order)

* edge sharpness wide-open
* center sharpness wide-open
* edge & center sharpness @ f8
* size/weight
* Versatility (maybe function of size vs. zoom & range )
* flare resistance
* contrast/color wide-open and stopped down
* distortion
* CA/PF
* build quality
* AF speed



Now - given the criteria above, the DA 15ltd, based on my personal weightings of those criteria, wins. The DA 12-24 comes in a respectable second, maybe the Sigma 10-20, Pentax 14 2.8 and Pentax 16-45 tied for third. (Sigma 8-16 is over on another track this round, might be coming over here to join the leaders shortly.

BTW, below is an example of the DA 15ltd wide-open center performance, I have many others, this one is from day before yesterday:


f/4



.

Just a sample/test shot, but you should be able to glean from that how you as a photographer could use it at f/4.



.

06-01-2010, 07:18 PM   #47
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QuoteOriginally posted by rparmar Quote
That's on full frame, right? So not comparable to APS-C.
If you go back and look, I pointed out the test was done on ff EOS. However, it comes in K-mount and the last time I looked, my MZ-3 takes k-mount. Now if I had $1300 laying around.
06-01-2010, 09:22 PM   #48
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Taken today with the DA 15mm.



06-02-2010, 05:15 AM   #49
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QuoteOriginally posted by jsherman999 Quote
(in no particular order)

* edge sharpness wide-open
* center sharpness wide-open
* edge & center sharpness @ f8
* size/weight
* Versatility (maybe function of size vs. zoom & range )
* flare resistance
* contrast/color wide-open and stopped down
* distortion
* CA/PF
* build quality
* AF speed
This is definitely the smart way to approach things. Since no one lens is perfect and many lenses are "good enough" for the job, the only way to tell which is right for you is to list priorities. However, these need to be in order of importance. I suggest that anyone trying to decide should take J's list and figure out their priorities.

I would also add the following, which are more important for film:
* full-frame compatible
* vignette characteristics
* presence of aperture ring

And this one:
* manual focus feel

The only way to prioritise these is to know what you are likely to use the lens for. A lot of discussion on "best lens" ends up being at cross-purposes since one person needs a lens sharp corner to corner for shooting walls (that would be me) while another centres their subject and want absolute sharpness in the centre... and so on.

My own personal conclusions:
* if you want a landscape lens, for use even in low light, get the FA31
* if you want an excellent flexible wide angle, get the DA12-24
* if you want wide and pocketable, get the DA15

06-02-2010, 10:20 AM   #50
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QuoteOriginally posted by jsherman999 Quote
.
BTW, below is an example of the DA 15ltd wide-open center performance, I have many others, this one is from day before yesterday:
Nice as always. For people wondering about the fall-off from center to edge, check out the ear and the hair just in front of it. See how sharp these are in the 100% crop, and then check out the position of the ear in the resized full image. In my experience, it's still equally sharp somewhat further off center still.

Last edited by Marc Sabatella; 06-02-2010 at 10:26 AM.
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