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04-03-2008, 10:04 AM   #16
JMS
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I'm talking about the Sigma- it will have an aspherical element, which usually equates to not-so-good bokeh.

04-03-2008, 10:44 AM   #17
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Sigma HSM on Pentax

I had e-mailed Sigma in late March for some further info on their 10-20, including any plans to enable HSM on Pentax mount. In the reply, they volunteered the following:

"... Currently the only plans to produce HSM for Pentax are going to be in the 70-200 and the 50-150 ..."

granted, I wasn't asking about primes, but it looks like a pretty comprehensive statement.

nBd
04-03-2008, 12:46 PM   #18
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Sorry, thought you were responding to my comments on the DA 55 SDM
04-03-2008, 01:00 PM   #19
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I'd personally love to have a weather sealed, HSM version of the 50 1.4 I have grown to love.
The Sigma probably wont be comparable optically to the Pentax, when it comes out.

04-03-2008, 09:48 PM   #20
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Lets see how the new 55mm F 1.4 sdm works out, The sigma price wise doesn't seem worth it
04-04-2008, 05:24 AM   #21
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One thing to note is that currently Pentax uses a micro-motor USM and Sigma has always used a true "ring-USM" for their HSM lenses.
I had the 50-135mm and it's SDM focusing was not nearly as quick as my Canon ring-USM lenses and my two Sigma HSM lenses (the 10-20 and 30mm f/1.4)

So depending on how the Sigma compares pricewise with the new 55mm, it may very well be the better buy.
04-04-2008, 08:38 AM   #22
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The IQ should be important as well. Even if the SDM is not as fast as the ring USM, it's still much faster than most Pentax lenses. From my experience, third party (TP) lenses only have one advantage: price. I've not seen any TP lenses that can beat the major one in term of IQ yet. If the price difference between this Sigma and the DA* 55 is small relative to the IQ difference, Sigma would stand a little chance, being squeezed in between the FA 50 and DA* 55.
04-04-2008, 08:47 AM   #23
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I guess I've been lucky with third-party lenses. From Sigma, I've used the 105mm f/2.8 Macro, 10-20mm (for both Pentax and Canon), and the 30mm f/1.4. And the Tamron 28-75mm f/2.8. All have been spectacular!

12-15-2008, 10:22 PM   #24
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I've been reading alot of reviews on the sigma 50mm f1.4 and everything I've read so far is saying it is a far better lens than the pentax. Bokeh is gorgeous, much sharper wide open, faster and quieter focusing... and so on. Most reviews have been 9-9.5/10. But I'm still waiting to see the new pentax 55mm f1.4 to compare.
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