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07-01-2008, 05:05 PM   #1
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Sigma 50 1.4 is looking to be amazing

Sigma 50mm: Marmite Bokeh - FM Forums

Sounds promising to me.

Wide open at 1.4

100% crop

07-01-2008, 05:50 PM   #2
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Was this picture taken by you? Picture was shot using a Canon 20D...
The CA is pretty noticeable.
07-01-2008, 06:07 PM   #3
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i was looking at Canon forums prior and the wide open performance seemed pretty good. nice of Sigma to step up and use some newer designs in a 50, especially considering all the major manufacturers haven't changed the "formula" for decades.
from the link, the bokeh imo looks very smooth, although someone else there mentioned terrible

Last edited by k100d; 07-01-2008 at 06:14 PM.
07-01-2008, 07:25 PM   #4
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Apparently, Adorama is already taking preorders for it in the Pentax mount.
310109 Sigma 50mm f/1.4 EX DG HSM Auto Focus Lens for Pentax AF Cameras (*Auto Focus only if body supports HSM)
The price is steeper than I thought it would be, especially considering that the Pentax FA50/1.4 is less than half the price brand new. Granted, it doesn't have HSM, but to me HSM isn't worth an extra $300. For a 50mm lens, this thing is a monster, weighing in at 18.3 oz. and taking a 77mm filter.

For the record, I just picked up an A50/1.7 off of Fleabay shipped for $74.50. This should keep me satisfied until the DA*55/1.4 comes out. Even if it runs about the same price as the Sigma, it would have weather sealing and I would assume that it would be smaller.


07-01-2008, 07:36 PM   #5
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QuoteOriginally posted by hwblanks Quote
The price is steeper than I thought it would be, especially considering that the Pentax FA50/1.4 is less than half the price brand new. Granted, it doesn't have HSM, but to me HSM isn't worth an extra $300.
Especially since the FA 50 is a pretty quiet focusing lense to begin with.
07-01-2008, 08:08 PM   #6
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At that price tag i'd rather get a ZK 50/1.4 or hold out for a DA* 55/1.4
07-01-2008, 08:22 PM   #7
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it is also a relatively large lens w/ a 77mm thread
07-01-2008, 09:12 PM   #8
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*shrug*. Gonna take more than those pics to show why (as others have mentioned) I'd rather have this than 1 of many less expensive (and higher pedigree) 50s available to K-mount.

On a positive note, they beat Pentax to an SDM style lens in this catagory, though I doubt its enough to make the K-mount version of this lens wildly successful.

50s I'd rather have at the price:

1) 58/1.4 Voigtlander Nokton $379
2) 50/1.4 Zeiss Planar $499
3) 50/1.2 Pentax $var, approx $450
4) 50/1.4 Super Tak $75
5) 50/55/1.2 Porst/Revuenon (Cosina) $250+

FWIW, I'll gladly see how it looks, but it'll have a lot of competition unless HSM has been on everyones wish list.

07-02-2008, 12:17 AM   #9
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If Sigma hands me over one I'll use it on my Sigma body, however for now I'm happy using my Super Tak on both my systems

In my opinion the only thing that I'm missing is AF, which I can live without
I should say that my copy appears to be sharper than some at f1.4 making the decision easier.
07-02-2008, 12:40 AM   #10
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QuoteOriginally posted by Tyler Quote
I don't know ... To much CA for my taste!
07-02-2008, 07:53 AM   #11
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The Sigma might be larger because it probably focusses closer than the FA 50mm.

In any case, I think people on this forum tend to forget that one thing that has characterised Pentax for a long time is the production of small lenses, especially primes, without sacrificing image quality. Just compare the FA* 24mm f/2 to the Sigma 24mm f/1.8. For this reason, I'm really hoping Pentax announce a fast 24mm before I buy the Sigma.

As for the 50mm, I'm keeping my FA. Sigma would have to pry it from my cold, dead hands
07-02-2008, 08:06 AM   #12
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QuoteOriginally posted by creampuff Quote
The CA is pretty noticeable.
It's a Sigma...

07-02-2008, 09:36 AM   #13
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I'm assuming the DA*55 will be at least $500 or more
07-02-2008, 09:46 AM   #14
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This lens is attractive to Nikon users because it will actually autofocus on the D40/D60 bodies. It is attractive to Canon users because the Canon 50mm f/1.4 doesn't have true ring-USM and can be fairly soft wide-open.

Pentax already has the excellent FA 50mm f/1.4 which autofocuses on ALL Pentax bodies and is a decent performer wide open.
07-02-2008, 10:18 AM   #15

Suposedly the new Sigma is optimised for better performance in resolution and contrast from the wide open onwards. From the photozone MTF graphs Pentax FA 50 is pretty soft until f2.0 and becomes good @ 2.8. The Zeiss and Nokton 58 are kind of a stop better (what P has @ 2.8 those 2 have @ f2) and more even across the center and borders.

I saw (and done) pics with FA 50 @ 1.4 - 2 and some are usable but all Pentax designs (including A and K50/1.2) lack contrast and sharpness in corners pretty bad at this range. Anyway one must take into acount the very thin DOF after all at this apertures.

I personaly will wait for DA* 55 and compare it with Sigma but right from the start a major difference is that Sigma it's FF and Pentax not. Besides I kind of like the gold band.


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