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07-26-2008, 07:39 AM   #16
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QuoteOriginally posted by revinhood Quote
which buy?
Pentax 21mm /3.2 Limited

07-26-2008, 09:08 AM   #17
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What about the best zoom for crop 11-16 2.8 Tokina?
07-26-2008, 11:34 AM   #18
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Tokina 11-16 in Pentax mount?
I can not find none ebay.
07-26-2008, 11:58 AM   #19
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QuoteOriginally posted by rparmar Quote
The Pentax 12-24mm is actually 30g lighter than the Sigma 10-20mm.
Robin, you caught me. According to the websites, the difference is even bigger: 40 gramms… Nevertheless, the Pentax is a bit longer and has a larger diameter, too - not that the difference is really big.

Ben

07-26-2008, 11:59 AM   #20
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QuoteOriginally posted by revinhood Quote
Tokina 11-16 in Pentax mount?
I can not find none ebay.
I can hardly imagine, that you ever will, as it looks as Pentax and Tokina have agreed, that they develop lenses together and therefor each company will keep out of the other's claims - not really a surprise now, where both belong to the same family...

Ben
07-26-2008, 03:40 PM   #21
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And how does the Sigma 12-24 compare to the two others?
Nobody ever mentions this one!
07-26-2008, 04:10 PM   #22
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I think the distortion argument comes down to what you're shooting. For interior/architectural work, the less distortion the better. However, for landscapes and candid stuff you probably won't notice the distortion.

Now, I know ken rockwell isn't all that popular around here, but bear with me. In his ultra-wide shootout, he talks about the distortion of these lenses (most here would agree, the tokina is optically the same as the pentax). If you look at his guide image, only when you're deliberately trying to show the distortion in a landscape shot does it become visible. If you ignore the top inch of that picture, you'd be hard pressed to point out any distortion. It doesn't really matter in the landscape realm.
07-28-2008, 04:33 PM   #23
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For me the question was; will the 2mm wider of the Sigma serve me better than the 4mm longer of the Pentax considering the US $300, (when I bought the price difference was greater, today it is about US $180) additional cost.

As to the discussion of distortion, I don't really think you can call one over the other and it seems like both are correctable in software, quoting photozone

"At 12mm there's a relatively pronounced degree of slightly wavy barrel distortions (~2.1%)"

"At 10mm most of the image field is almost free of distortions so the measured distortions figures look fairly fine here (taken a little inward from the borders). However, this is only part of the truth. If you check the 10mm distortion chart below you will notice that the extreme corners are actually quite (barrel-)distorted - probably in the 2-3% range."

Thank you
Russell

07-29-2008, 04:56 AM   #24
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I cannot really contribute to this topic as I have never used the Pentax 12-24, but I do know that I already love my Sigma 10-20 which I acquired yesterday. Granted, it's not the sharpest lens in my bag but the possibilities absolutely make up for it.

Here are my first pics, shot with the D-Range at 200% (on my K20D):

1.


2.


3. Bokeh test shot. Strange field of sharpness, but that is to be expected with a ultra-wideangle.
07-29-2008, 05:53 AM   #25
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Out of topic for IQ

QuoteOriginally posted by revinhood Quote
which is better optically. pentax 12-24 or sigma 10-20
in this forum is valued at best sigma (9.29), even better is valued at Pentax 10-17 (9).
The Pentax 12-24 is worth the 8.86.
but I have heard that the best is the Pentax 12-24.
which buy?
IQ put aside, 2mm on the wide end is a lot, 4mm on the long isn't ...
07-29-2008, 07:17 AM   #26
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QuoteOriginally posted by Lowell Goudge Quote
I have looked and looked at all the thousands of images I have done with my sigma at 10mm and have only one question. What significant barrel distortion?

I simply don't see it.
Can you see it in this? It looks pretty obvious to me. Look at the left and right vertical edges of the house. Trust me, they're straight in real life.



It's easily correctable, though, of course. And for the money, I've been very pleased with the lens.

Almost all of these were taken with it.
07-29-2008, 12:53 PM   #27
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QuoteOriginally posted by ChrisA Quote
Can you see it in this? It looks pretty obvious to me. Look at the left and right vertical edges of the house. Trust me, they're straight in real life.



It's easily correctable, though, of course. And for the money, I've been very pleased with the lens.

Almost all of these were taken with it.
There is some visible distortion, but I have yet to see any other super-wide angle, that is free from this kind of distortion. Even my Pentax 15mm/3.5, which can be counted among the very best WA lenses and is a rectilinear modell, shows distortion to a comparable degree. And on an APS-C sensor, the Sigma 10mm is the equivalent to the Pentax.

Ben
07-29-2008, 01:08 PM   #28
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Pentax 12-24mm at the wide end

Here is an example of the Pentax 12-24mm at 12mm end, do you see any barrel distortion? again, this is only 12mm not 10mm as the sigma can provide.

Last edited by aleonx3; 04-19-2009 at 07:10 AM.
07-29-2008, 02:22 PM   #29
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QuoteOriginally posted by aleonx3 Quote
Here is an example of the Pentax 12-24mm at 12mm end, do you see any barrel distortion? again, this is only 12mm not 10mm as the sigma can provide.
I don't know if it is distortion but the two buildings on each side look like they are leaning...
Yup it is distortion!

This being said, if anyone can find me any lens wider than 20mm that is totally free of distortion, please enlighten me!
07-29-2008, 03:18 PM   #30
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QuoteOriginally posted by deudeu Quote
I don't know if it is distortion but the two buildings on each side look like they are leaning...
Yup it is distortion!

This being said, if anyone can find me any lens wider than 20mm that is totally free of distortion, please enlighten me!
I own a Sigma 10-20 with a K200D . I can attest that there is significant distortion. You have to be really careful not to take people with it.

Look at this shot, taken from accross the table :

IMGP3648 photo in 2008 Europe trip on Share on Ovi

and the next one, seconds later.
IMGP3649 photo in 2008 Europe trip on Share on Ovi

Now, my sister is pregnant, but she is not as big as in the first shot

FYI I took those shots on purpose as a joke .
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