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11-28-2007, 02:48 AM   #16
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Have you considered Sigma EX 30/1.4?
If not, why?

11-28-2007, 06:08 AM   #17
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Costs more? Just a guess.
11-29-2007, 02:25 AM   #18
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QuoteOriginally posted by Kresica Quote
Have you considered Sigma EX 30/1.4?
If not, why?
I have the Sigma 20/1.8, 24/1.8 and 30/1.4. These are very different lenses.

The 30/1.4 is a crop-format lens only. It is sharp to very sharp in the center of the frame but the borders never really catch up with the center, even when the lens is stopped down. It has a very nice bokeh. Unfortunately, it also exhibits a lot of purple fringing wide open if there are bright lights or specular reflections in the frame. As a consequence, this is a good lens for capturing interior scenes with a centered subject in available light, but the lens is not very usable for landscape work (soft corners) or night shots (purple fringing). The focal length is also too short for close-up portraits.

The 24/1.8 is the best compromise of the bunch IMHO. It is quite sharp over the whole frame even wide open, doesn't exhibit too much purple fringing, chromatic aberrations or distortion and is fast enough to allow low light photography. Its focal length is very useful on a film camera, but it has still a reasonably wide FOV on a crop-format camera. It is a very versatile lens and I use it for landscape and cityscape shooting, street photography, social gatherings and even close-up photography -- its close focus feature allows the user to take pictures with the subject practically touching the front lens.

Wide open, the 20/1.8 is much softer over the whole frame than the 24/1.8. It becomes sharp at around f/3.5 and very sharp at f/8. When used wide open, the lens gives a rather "dreamy" effect that I don't like very much. I use it mainly as a good wide lens (superwide on film) for landscape or night shooting -- stopped down with a tripod. But then, why bothering carrying such a big lens to use it at f/8, while the much smaller FA 20/2.8 or Super-Takumar 20/4.5 are at least as sharp at this aperture?

Cheers,
11-29-2007, 02:50 AM   #19
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QuoteOriginally posted by Abbazz Quote
Wide open, the 20/1.8 is much softer over the whole frame than the 24/1.8. It becomes sharp at around f/3.5 and very sharp at f/8. When used wide open, the lens gives a rather "dreamy" effect that I don't like very much.
How did you focus? Using AF?
I cannot confirm this. The 20/1.8 is already quite good at f1.8.

Example: 100% Crops



The main problem of this lens is that many have a misaligned AF, for whatever reason.
After focus adjustment at Sigma, my 20/1.8 performs perfectly.

11-29-2007, 06:13 AM   #20
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QuoteOriginally posted by blende8 Quote
How did you focus? Using AF?
I cannot confirm this. The 20/1.8 is already quite good at f1.8.
I don't like AF and I don't use it much. Unfortunately, my 20/1.8 is not very sharp wide open, even when carefully manually focused. Sigma considers that my sample is not faulty, so it shouldn't be too far from the norm Yours seems sharper though, but the 24mm at 1.8 in the center of the frame is sharper than the 20mm in your picture.

Anyway, my point is that the Sigma 20/1.8 and 24/1.8 are better lenses IMHO and are more versatile than the 30/1.4. I think that we agree on this. The 28/1.8 seems to be a very good lens also, but I find the focal length not so useful on a crop-format camera.

Cheers,
11-29-2007, 07:50 AM   #21
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Here are some pictures taken with the Sigma 24/1.8 in my neighbour's garden:


f/5.0 1/40sec.


100% crop of previous picture


f/5.0 1/50sec.


f/5.0 1/40sec.


100% crop of previous picture


f/5.0 1/40sec.


f/5.0 1/40sec.


f/5.0 1/30sec.

Cheers,
11-29-2007, 08:51 AM   #22
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Nice samples from the Sigma... I always prefer real world shots to pixel peeping.

The Sigmas seem like wide angle macro lenses with their close focusing ability. I'm very curious about either the 20mm 1.8 or 24mm 1.8, since my DA 14mm doesn't seem to get much use. I think the field of view is just too wide for my tastes, but still feel I need something fairly wide. If I get rid of the 14mm, my widest lens would be 28mm.... more of a normal range.

11-29-2007, 02:00 PM   #23
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QuoteOriginally posted by hamidlmt Quote
Nice samples from the Sigma... I always prefer real world shots to pixel peeping.

The Sigmas seem like wide angle macro lenses with their close focusing ability. I'm very curious about either the 20mm 1.8 or 24mm 1.8, since my DA 14mm doesn't seem to get much use. I think the field of view is just too wide for my tastes, but still feel I need something fairly wide. If I get rid of the 14mm, my widest lens would be 28mm.... more of a normal range.
Well I've been saying (to anyone that'll listen to me) that we need nice fast wide angle primes. Not ultra wide like the 14mm, but something like 16-18mm and maybe another lens around 24mm.

That's why I got the Sigma.

But I'd go crazy if my widest lens was a 24mm or 28mm. I just use ultra wide too often.
11-29-2007, 03:14 PM   #24
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QuoteOriginally posted by alinla Quote
Well I've been saying (to anyone that'll listen to me) that we need nice fast wide angle primes. Not ultra wide like the 14mm, but something like 16-18mm and maybe another lens around 24mm.

That's why I got the Sigma.

But I'd go crazy if my widest lens was a 24mm or 28mm. I just use ultra wide too often.
Al, I have to agree with you. I have the Sigma 24 F1.8 and yes it's a great lens, but I still use the kit lens fairly frequently and, of course my Zenitar. I'm also in the market for a 12-24, but I want to get the Pentax rather than the Sigma, because I think IQ is better, and I always prefer a constant aperture lens if possible. Maybe, if I'm lucky, Santa will help me out a bit it's an expensive lens.

NaCl(but worth every penny I'm thinking)H2O

Obligatory Sigma 24 F1.8 Shot with K10D, f2.5 @1/50.

Last edited by NaClH2O; 11-29-2007 at 03:27 PM.
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