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02-22-2010, 05:38 PM   #1
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Another Pentax DA 16-45mm vs Sigma 17-70mm; Low Light Situations.


My name is jorge and i just purchased my first DSLR, the K-x, this january and have been lovin it. Now i enjoy taking night time city/urban shots and would like to have a wide angle lens. I currently have your standard kit lens and a 55-300mm lens. I have read many posts and viewed many sample pics but am a little confused. I just want a lens that has good IQ and can take nice low light wide angle shots. I’m leaning towards the sigma but dont know if i want to sacrifice 1mm on the wide side for larger aperture.

Thanks in advance.

Last edited by boosted03gti; 02-22-2010 at 05:48 PM.
02-22-2010, 08:19 PM   #2
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To shoot in low light, you want a fast lens with a large aperture. You may find that most zooms can rarely provide both, but at a price and with a size. Instead you may consider a 50mm or 43 mm prime. There is an very recent discussion in the Pentax FA50mm f1.4 at:

I use a 58mm f1.4 prime with my K-7. I bought it for the low light situations (mainly outdoor in my case) and its low light performances are very impressive compared to most zooms and kit lenses that I tested to date. The prime lenses are also very small and compact: easy to carry on the camera including in an urban area.

Pentax is well known for a very good range of excellent fast prime lenses compared to other camera brands: e.g., 43 mm, 50 mm, 55 mm ... You may look at for some comparative, independant tests as well as DPreview and lens review.

Hope that the info will help ...
02-23-2010, 07:25 AM   #3
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i plan on purchasing a pentax smc-a 50mm 1.7. just wanted something for when i want to take a wide angle night time shot. like a city sky line or busy intersection etc.

im also considering the tamron 17-50mm 2.8. the more i read about this lens the more i think its the one for me.

Last edited by boosted03gti; 02-23-2010 at 08:14 AM.
02-23-2010, 08:47 AM   #4
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Sorry, misunderstood your second post

DA14/2.8 might be an option; can not judge if it financially feasable

Last edited by sterretje; 02-23-2010 at 08:53 AM.
02-23-2010, 09:47 AM   #5
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yea, the DA14/2.8 is a little out of my budget. i went with the tamron 17-50mm. i figured it a good quality lense and a good walk around wide lens and should meet my needs. its small, light, fast, wider then kit lens, and is in my budget. ill try it out and if all else fails, ill sell it and try something else. thanks for the advice. this forum has too much information.
02-23-2010, 10:00 AM   #6
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Congrats. There is lots of love for the Tamron 17-50 on this forum. I love mine--small and relatively light, but still substantial feeling; nice range; constant 2.8 is a real asset; and most importantly, great IQ--very sharp and nice colors. If you're one to test your new lenses, there are some reports of front focus or back focus with this lens, so you might want to check it out. But I've never noticed issues with it in my usage.
02-23-2010, 02:03 PM   #7
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For nighttime cityscapes, you're really better off stopping down for DOF and using a tripod or other support, rather than worrying about fast apertures, high ISO, and handholdability. Although realistically, at very wide angles, you don't need a particularly fast shutter speed to handhold and get more or less acceptable sharpness. Either way, I wouldn't sweat the speed difference too much when it comes to wide angle shooting.

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