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11-04-2011, 04:47 PM   #31
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QuoteOriginally posted by SylBer Quote
There is an interesting comparaison of these two lens on the following site:

Test_31ltd

It's in French, but the pictures speak for themselves.
Thanks for the link Syl!

I think I made the right choice for what I need, I purchased the Sigma from a forum member a few years ago (paid $300).

11-04-2011, 05:10 PM   #32
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QuoteOriginally posted by SylBer Quote
There is an interesting comparaison of these two lens on the following site:

Test_31ltd

It's in French, but the pictures speak for themselves.
Thanks for that link...
If I didn't see the caption under each image, I wouldve thought the better images would've come from the Pentax, and I would've been wrong!
The sigma pics looked better to me, and that doesnt even take into account the $$$
11-04-2011, 06:05 PM   #33
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Yes great link and great read!
Very good comparrsion, translated link-
Google Translate

Never new the 31 had such bad CA's!

Last edited by TOUGEFC; 11-04-2011 at 06:13 PM.
11-04-2011, 07:18 PM   #34
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The 30mm looks great in this comparison. I would like to see a three way compare between the 28/1.8 sigma as well.

11-04-2011, 08:29 PM   #35
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QuoteOriginally posted by TOUGEFC Quote
Never new the 31 had such bad CA's!
I'm astonished the Sigma 30mm f/1.4 has such bad corners - in that comparison the FA31 is great from f/2.8 - the Sigma 30mm puts in a mediocre performance even at f/11, which IMO makes it a poor choice for landscapes and full length portraiture.
11-04-2011, 08:35 PM   #36
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Yeah its not a landscape lens. Im suprised the sigma 30 beat the 31 in bokeh too, thats supposed to be one of the best things about the 31, I guess they had a bad copy?
Full length portrait no worries

Last edited by TOUGEFC; 11-04-2011 at 08:44 PM.
11-04-2011, 08:56 PM - 1 Like   #37
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QuoteOriginally posted by TOUGEFC Quote
Yeah its not a landscape lens. Im suprised the sigma 30 beat the 31 in bokeh too, thats supposed to be one of the best things about the 31, I guess they had a bad copy?
Full length portrait no worries
Images from OZ are always better than images from the U.S. no matter the lens.
11-04-2011, 11:34 PM   #38
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QuoteOriginally posted by TOUGEFC Quote
Yeah its not a landscape lens. Im suprised the sigma 30 beat the 31 in bokeh too, thats supposed to be one of the best things about the 31, I guess they had a bad copy?
Full length portrait no worries
I'm sure I remember you saying a while back saying something like you were going to wait until you were more financial before you got the FA31? Have you given up getting the third FA now?

11-04-2011, 11:41 PM   #39
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Not me, ive never said that.
11-05-2011, 12:05 AM - 1 Like   #40
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QuoteOriginally posted by TOUGEFC Quote
Full length portrait no worries
when viewed as a web sized jpg perhaps. However as a 13X19" print i'm quite confident any comparison between the FA31 and Sigma 30, the differences will be quite apparent. The sharpness of the Sigma 30mm f/1.4 in the centre is very impressive but the lacking IQ in the corners makes it a bit of a specialised lens. the FA31 does everything well - which is why it makes such a good general purpose lens. The differences in chromatic aberration characteristics can be chalked up to sample variation. My FA31 doesn't fringe much at all, and the TCa* is easily manageable in LR3.

*Transverse Chromatic Aberration

I have a copy of this image printed at 13"X19". The corner sharpness of the FA31 is a crucial aspect to consider when one wishes to create images with a near-far relationships like this.

Last edited by Digitalis; 11-05-2011 at 12:14 AM.
11-05-2011, 12:31 AM - 1 Like   #41
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QuoteOriginally posted by Raybo Quote
Images from OZ are always better than images from the U.S. no matter the lens.
It must be the wizards....
11-05-2011, 12:32 AM   #42
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QuoteOriginally posted by TOUGEFC Quote
Not me, ive never said that.
My mistake, someone else must have said it.
11-05-2011, 12:39 AM   #43
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Its a shame that MTF50 scores are the ones most people look for because MTF10 scores show the true resolution of the lens (ie micro contrast) rather than the macro contrast. I read another review (can't quite remember which) which stated that the FA 31 MTF20 scores were off the charts and were what was responsible for it's snap crackle and pop. It's the combination of everything that makes the IQ. Not that my photographs are anything to write home about.. just my US$0.02 x the AU exchange rate. ;-)
11-05-2011, 12:54 AM - 1 Like   #44
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QuoteOriginally posted by Digitalis Quote
when viewed as a web sized jpg perhaps.
I got that shot printed for my folks at 12"x18" and its very impressive even in the corners.
I have no doubt that even if it was printed at 20"x30" it would be just as impressive.

At the end of the day they are both great lenses.
If your a landscape shooter get the 31.
If your a portrait/shallow DOF shooter get the 30.

Last edited by TOUGEFC; 11-05-2011 at 01:27 AM.
11-05-2011, 02:09 AM   #45
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QuoteOriginally posted by TOUGEFC Quote
At the end of the day they are both great lenses.
If your a landscape shooter get the 31.
If your a portrait/shallow DOF shooter get the 30.
And that is the truth. We all know the 31 is a great lens, a classic in every sense of the word, but Sigma have come up with an amazing lens for the money. I said earlier though that the 31 is over-priced in comparison to other Pentax Ltds (though maybe not to Canon/Nikon/Sony's best lenses perhaps.

However I also stick by my previous assertion that for shooting landscapes the CZ 28/2.8 is a wonderful lens and you can match that to the Sigma 30/1.4 for the same price as a 31 and have more flexibility / options than the 31 alone.
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