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09-07-2009, 09:02 PM   #1
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Wide angle advice

I have a pentax 10-17, 18-55, 35 2.0, and tamron 18-200. But i would like to get a little better wide angle option. I'm considering the 16-45 which i think i can get for around $300, or a 14/2.8 or tamron 10-24. I think the 12-24 is too much of a stretch right now - or should i wait and get a 12-24 when i can? I'm looking for quality for the money. Any advice?

09-07-2009, 09:31 PM   #2
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What do you mean by a "better wide angle option"? The 16-45 is a much better lens than the 18-55 you currently have, but it will not cover extreme wide angle.

The Sigma 10-20 will cover the range that your 10-17 now covers, but it will be rectilinear instead of fisheye. I have one of these and love it. I think if money is an issue, it is an extremely good value. I find that I use the 10mm end of the range about 1/2 the time, so I would miss this range with a longer lens.

The 14/2.8 is a good option if you need speed, but this lens suffers at F2.8 and will be far better stopped down. It will be easier to focus in low light, though.




QuoteOriginally posted by Pentastic Quote
I have a pentax 10-17, 18-55, 35 2.0, and tamron 18-200. But i would like to get a little better wide angle option. I'm considering the 16-45 which i think i can get for around $300, or a 14/2.8 or tamron 10-24. I think the 12-24 is too much of a stretch right now - or should i wait and get a 12-24 when i can? I'm looking for quality for the money. Any advice?
09-07-2009, 09:35 PM   #3
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09-07-2009, 10:16 PM   #4
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I think when I say "better wide angle option" I really mean as "sharp" as I can afford (which I realize only I can say). So relative to value, what is the sharpest lens I should consider.

09-07-2009, 10:24 PM   #5
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DA 14 is a super lens. I've used the sigma 10-20 on a Canon mount and it's sharp.
09-07-2009, 10:33 PM   #6
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QuoteOriginally posted by Pentastic Quote
I think when I say "better wide angle option" I really mean as "sharp" as I can afford (which I realize only I can say). So relative to value, what is the sharpest lens I should consider.
The sharpness of a lens is heavily influenced by its focal length and the aperture you intend to use. A 35mm lens will generally be sharper than a 10mm lens, so to make the best choice, you have to be more specific about what focal length or range of focal lengths you intend to use.

The Sigma 10-20 is generally as sharp as the 14mm F2.8 at 14mm and F8, but it will not go down to F2.8. If you really need F2.8, at 14mm, then the Sigma is out. If you intend to use the lens outdoors, then the F2.8 aperture is not as important. If you use the lens to take available light pictures indoors, then the 14mm will be the better choice.

If CA is important, the Sigma 10-20 has relatively low CA for its focal length range.

Size and weight are also a factor. The 15mm F4 is a very compact, lightweight lens. The Sigma 10-20 and the 14mm F2.8 are relatively large and heavy.
09-07-2009, 10:34 PM   #7
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Sounds like you're juggling a very common question. The answer is going to be with what exactly you want and how you will use it. Would you be comfortable with a prime? Do you want the extra speed and shallow DOF of the 14mm 2.8? Do you want the build quality and size of the DA 15mm? Or perhaps you want the versatility of a slightly wider, though with less reach, but better quality zoom. Do you use the kit lens much?

QuoteOriginally posted by pentaxman Quote
The Sigma 10-20 will cover the range that your 10-17 now covers, but it will be rectilinear instead of fisheye. I have one of these and love it. I think if money is an issue, it is an extremely good value. I find that I use the 10mm end of the range about 1/2 the time, so I would miss this range with a longer lens.
The Sigma 10-20mm does not cover the same range that the Pentax 10-17mm Fisheye does. The Sigma's diagonal coverage is 109 degress at 10mm and the Pentax, being a fisheye, is 180 degrees at 10mm. In fact, the Pentax is nearly as wide at 17mm (100 degrees) as the Sigma is at 10mm.
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