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10-14-2011, 10:39 PM   #16
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QuoteOriginally posted by Penta_Prisma Quote
good evening everybody :

some of you suggested DA16-45 Or DA17-70.
with regard to quality and performances which one of them is the best also compared to the tamron 17-50/2.8 ?
and just curiosity the DA 16-50 really beat all of them ?

thanks
From those, my call in your scenario would be between the Tamron 17-50/2.8 and the Pentax DA17-70/4. It will be a call between some extra reach / less lens swapping (17-70) or a bit faster (17-50). For what you like to shoot, I don't think that faster will be the main factor so I would opt for the DA17-70/4.

I don't have any of the lenses, but I'm sure that each of them will give you satisfying results. Users of each of the four generally seem to be very happy with them. There was also a test here on Pentaxorums recently (can't find it) that compares the Tamron, DA*16-50 and a Sigma (18-50). The Sigma came out best, Tamron second and DA16-50 third; difference between Tamron and Pentax was 0.1 point if I'm not mistaken). For any of the lenses, suggest that you get extended warranty on them.

One note on hunting faces
To fill a photo with a face at approx 10 meters distance, you need a lens with a focal length of about 700mm (in portrait); of course you can always cut away part of the photo if it was shot with a 300mm lens. But just so you don't get too big expectations.

10-16-2011, 06:21 AM   #17
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hi , thanks for your reply
you mean sigma 17-50/2.8 ? in italy they sell it for 960$
at this price i can get da*16-50.
what do you suggest ?
another question.......the canon 28-300L is 100% compatible with the k5 ?
thanks

six
10-16-2011, 06:52 AM   #18
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QuoteOriginally posted by Penta_Prisma Quote
another question.......the canon 28-300L is 100% compatible with the k5 ?
NO!! Canon lenses can NOT be used on Pentax cameras! Many Pentax lenses can be used on Canon cameras, but not the other way around.
10-16-2011, 08:22 AM   #19
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Read Comparative Review: Fast Normal Zoom Shootout - Introduction completely and see what is relevant for you.

With your budget, get the Tamron 17-50/2.8 or the Pentax DA17-70/4 and add the DA55-300 for your teleneeds. Sigma, by the way, also has a 17-70.

10-16-2011, 01:08 PM   #20
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QuoteOriginally posted by Penta_Prisma Quote
hi , thanks for your reply
you mean sigma 17-50/2.8 ? in italy they sell it for 960$
at this price i can get da*16-50.
what do you suggest ?
another question.......the canon 28-300L is 100% compatible with the k5 ?
thanks

six
You must be kidding. The 28-300L is 2500euro lens and you would need 5D in the same price range to get the most out of it. You wrote that DA*16-50 is too expensive for you.

If you have at least the kit lens, try it and see how does it limit you.

If you don't have any lens, buy something cheap in 18-xxx range. I belive you will like it and if you won't, you should not lose too much money on it.
10-16-2011, 05:23 PM   #21
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QuoteOriginally posted by Penta_Prisma Quote
hi , thanks for your reply
you mean sigma 17-50/2.8 ? in italy they sell it for 960$
at this price i can get da*16-50.
what do you suggest ?
another question.......the canon 28-300L is 100% compatible with the k5 ?
thanks

six
Just make sure you are looking at the Pentax K-mount section when checking prices.

The Tamron 17-50 f2.8 has 2 versions.
Tamron -17-50mm F/2.8(Model A16)
The K-mount does not have or need "VC" stabilisation. It's smaller overall size too.

The Canon and Nikon mounts can also come with "VC" which is Tamron's name for Canon's "IS" or Sigmas "OS"
Tamron -17-50mm F/2.8(Model B005)
Because of the VC it is larger heavier and more expensive.


Fully agree with other comments about using the 18-55 kit lens first to find out what suits you.

If you are constantly banging into the 18mm then you might want to look at wider zoom from 16 or 17mm. 1mm makes a significant difference at the wider focal lengths. Keep in mind there are wide angle specialist lenses like DA15ltd or Sigma10-20, Tamron 10-24 to name few under $500.

If you find yourself banging into the 55mm and what a little bit more maybe the DA17-70 or the Sigma version.
Optically the 17-70 is supposed to be better than the 18-55 and it should be for the higher cost.

If you want to go a lot longer then then the DA55-300 is excellent for that and goes well with the 18-55. I think it one of the best value lenses Pentax make. (Pity its not WR though).

If you need better shutterspeed indoors, AND better IQ than the 18-55, then the aforementioned Tamron 17-50 2.8, Pentax 16-50 2.8 or Sigma 17-50 2.8. Check Adam's recent review on this site.
There is also a now superceded Sigma 18-50 f2.8 without any OS which is cheaper and might be still around.
With a K-5 having the extra brightness of the f2.8 is less of an issue as you can lift the ISO to bring your shutterspeed up with lens noise penalty (comparing with K-7 and older bodies).

If you dont like changing lenses then theres the DA 18-135 WR, Sigma 18-250 or there is the superceded Tamron 18-250 or the Pentax DA18-250 version which is the same lens. Don't ask about the Tamron 18-270 they wont make it for us.

That pretty much sums it up for new (or recent) zoom lenses one step up from the kit lens. Sure there is less available compard to Canon but seriously how many are you going to buy really.

Now.....
......on the other hand, if you DO like changing lenses.. welcome to Pentax my friend.
< Commences Lens Buying Addiction sequence NOW>
10-17-2011, 02:38 PM   #22
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thanks for the clear summary.
i really appreciate it.
now after all these opinions and suggestions come the difficult part......the decision.
really, thanks everybody.
last question : in terms of lenses quality which one of these are considered better :
17-70 ( pentax or sigma ) or 17-50 ( tamron, sigma ) / 16-50 ( pentax ) ?
thanks

six
10-17-2011, 02:44 PM   #23
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QuoteOriginally posted by Penta_Prisma Quote
thanks for the clear summary.
i really appreciate it.
now after all these opinions and suggestions come the difficult part......the decision.
really, thanks everybody.
last question : in terms of lenses quality which one of these are considered better :
17-70 ( pentax or sigma ) or 17-50 ( tamron, sigma ) / 16-50 ( pentax ) ?
thanks

six
PentaxForums did a review on the front page of the 17-50 Tamron, sigma and 16-50 Pentax. The Sigma came out on top barely over the Tamron (for the build quality). The 16-50 came in last. I think the Tamron 17-50 is the bargain of the bunch. These 3 lenses are also going to beat the image quality of the 17-70 lenses, you just have to ask if you need the reach or the speed and image quality.

10-17-2011, 11:46 PM   #24
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There are many aspects on image quality, some of them are best at Sigma, some at Tamron and some at Pentax. The front page review can be a good guideline about general aspects of handling, AF, or build quality. But image quality of lenses in this category is very variable from one piece to another and they are very close. With another set of tested samples the outcome regarding sharpness would be probably slightly different. But all are very good in the IQ department.
10-27-2011, 12:28 PM   #25
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good evening guys,

i've received the k-5 but i'm going crazy cause i received it at my parent's house ( italy ) and because of job reasons could not fly to italy for week end and come back here with the camera. no way to ship it because of extra import taxes in the country in which i live.

i've almost decided everything for the lenses but need still some more info , please help if possible .

the SIGMA 17-50/2,8 EX DC OS HSM PENTAX, this is the only model they sell here and in italy , i see OS it means that the lens is stabilized , but since i dont need stabilizations .....maybe there is a solution ? is possible to disable stabilization for this lens? or maybe in some other country they sell the same lens but without stabilizations ?

last question : differences in iq, speed, build etc for the da 17-70 and 17-70 of sigma.

thanks

six
10-27-2011, 12:32 PM   #26
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You can turn the image stabilization off on your camera or on the lens. If you want the older, non stabilized version, then you will probably have to find it used.
10-27-2011, 03:55 PM   #27
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kenafein thanks, know something about differences between DA17-70 and 17-70 of Sigma?

thanks
s.
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