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09-05-2009, 04:33 PM   #1
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Help to choose lens

Hi there, i bought K200d some days ago and now im lookin for lens. which one u could suggest from these 3? The most important for me is the sharpness and quality, not fast AF.

Pentax 16-45 f4
Tamron 17-50 f2.8
Sigma 24-70mm f2.8

I have checked them all, but i dont know which one to take.
And isnt Pentax 16-45 f4 too dark compared to others?
Thank you

09-05-2009, 04:40 PM   #2
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I think this Tamron design is the best, but their QC varies quite a bit. Make sure you buy it from some place allow exchange.
09-06-2009, 08:25 AM   #3
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QuoteOriginally posted by wlachan Quote
I think this Tamron design is the best, but their QC varies quite a bit. Make sure you buy it from some place allow exchange.
I agree. I have purchased two Tamrons seperately, in the past 10 months, without any issues.
09-06-2009, 08:36 AM   #4
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i have heard the pentax 16-45 is wicked sharp, but the 2.8 speed might be more desireable

09-06-2009, 09:20 AM   #5
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Another vote for the 16-45. I do not have one myself, but have seen many blisteringly good pictures taken with them.

It makes sense that a lens made for Pentax only is less compromised.
09-06-2009, 10:57 AM   #6
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I've never used any, but I've seen samples from each. Based on the characteristics you desire plus lack of neccesity of a faster lens, the 16-45 is my vote.
09-06-2009, 12:02 PM   #7
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yeah, but what about the brightness? I mean, istn f4 a bit too dark?
09-06-2009, 12:48 PM   #8
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Hey, Eriksons, good to see you here.

"Too dark" is relative. For a zoom the best you can do is f/2.8 and that generally means bigger, heavier and more expensive. The next best is a constant f/4, and the least good option is a variable aperture lens. Some of these might start at f/2.8 but get worse as the zoom, often ending up significantly darker than f/4.

So really it depends on how much you want to sacrifice to gain an extra stop. If you are truly concerned about speed, you need a prime. For this reason I have never bought a zoom faster than f/4. I think it's a good compromise. If I was a professional I'd need to pay the big bucks and haul around a monster lens to get one stop faster.

Don't forget that so long as your target is not moving, shake reduction gets you a couple more effective stops of slow shutter speed use. I hand-hold my DA16-45 at f/4 no problem.

The other thing is that some lenses may need to be stopped down one to get usable sharpness. So that maximum f/2.8 becomes an effective f/4 anyway. The DA16-45 is usable wide open, so that's not an issue.

09-06-2009, 01:20 PM   #9
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I would say Tamron 17-50. I would add a recommendation of the Sigma 17-70/2.8-4.5 but it seems like you want a lens with a fixed aperture at all zoom ranges.
09-06-2009, 02:00 PM   #10
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None of the above are bad choices.
You must choose the lens based on your needs.
Do you need f/2.8? That eliminates one lens.
Do you need wide angle? That eliminates another.
And you end up with the one that's best suited to you.

Other similar choices include the Tamron 28-75 f/2.8 and Pentax DA 17-70 f/4.
And those two are also highly acclaimed zooms...

Enjoy deciding.
09-06-2009, 08:48 PM   #11
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QuoteOriginally posted by Eriksons Quote
yeah, but what about the brightness? I mean, istn f4 a bit too dark?
If you're planning on using a lot handheld in low light, sure, f/4 is pretty slow. For most uses though - especially if your main concern is sharpness, as you say - you'd want to be shooting stopped down to f/8 or so with any of these lenses.
09-06-2009, 09:42 PM   #12
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I do not know about Sigma and Tamron but i have the DA 16-45 and the lens is very sharp even at f/4.
09-07-2009, 01:13 AM   #13
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For hand-held operation in lower light one must take into account the focal length. At 16mm the inverse rule tells us that 1/16s is ok and SR might get us 1/4s, though that takes steady hands. At 45mm the rule tells us 1/45s and we might get away with 1/12s. So say for simplicity we need 1/12s across the range. At f/4 and ISO400 this captures a lot of light!
09-07-2009, 02:04 PM   #14
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And what do you folks have to say about sigma 17-70?
09-08-2009, 03:22 PM   #15
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QuoteOriginally posted by Marc Sabatella Quote
If you're planning on using a lot handheld in low light, sure, f/4 is pretty slow. For most uses though - especially if your main concern is sharpness, as you say - you'd want to be shooting stopped down to f/8 or so with any of these lenses.
I don't know anything about the other two, but according to Photozone the 16-45 is sharper at F4 than it is at F8, and reaches maximum resolution at F5.6. According to me, it's damn sharp at F4.
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