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05-24-2017, 03:53 PM   #16
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Given your other lenses, I would go with the 16-85. It's just a fine lens and very versatile. With your fast 50 and the 70-300 you are all set. The improvement over the kit lens is very noticeable. It's even quite a bit better than the 16-45 DA that it replaced for me. The 16-85 is not flashy but it does the job!

05-24-2017, 04:07 PM - 1 Like   #17
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One small advantage of the 18-135 over the other options is that the 62mm filter size will match your Tamron 70-300. A CP-L is handy for outdoor shots with these lenses. I figure that if it's bright enough for me to wear sunglasses, the lens should have them too.
05-25-2017, 09:40 AM - 2 Likes   #18
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Since you're looking to replace the old 18-55mm, mostly for quality reasons, I'd look to the following (based on your criteria you've listed):

- Pentax 16-85mm (a litte more expensive, but highly rated lens) this will be larger/heavier than your 18-55mm kit by far
- Pentax 18-135mm ( good general purpose lens - I have one its on my camera most of the time )
- Tamron 17-50 / Sigma 17-50 - These are great lenses - f/2.8 would be great for indoors.

As an owner of the K-x some of these lenses may be a little bulky, and you won't enjoy the benefits of WR as much.
05-25-2017, 03:45 PM - 1 Like   #19
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Thank you everyone for your valuable input. It was really helpful. The following is my active list. Pentax 18-135 mm and Tamron 17-50 mm I may get a chance to try it before I buy. Anyway, I will finalize it this week.

Pentax 18-135 mm
Tamron 17-50 mm
Sigma 17-70 mm
Pentax 16-85 mm
Sigma 17-50 mm

05-25-2017, 05:39 PM - 1 Like   #20
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QuoteOriginally posted by krishna Quote
Thank you everyone for your valuable input. It was really helpful. The following is my active list. Pentax 18-135 mm and Tamron 17-50 mm I may get a chance to try it before I buy. Anyway, I will finalize it this week.

Pentax 18-135 mm
Tamron 17-50 mm
Sigma 17-70 mm
Pentax 16-85 mm
Sigma 17-50 mm
Great list ... they're all slightly different from each other to suit different styles.

You can't go wrong, Krishna.

Just remember, buy only from someone who will accept returns, and do tests for decentreing and front/back focus when you get it, so that you really get what you paid for.
05-25-2017, 06:10 PM   #21
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QuoteOriginally posted by krishna Quote
Thank you everyone for your valuable input. It was really helpful. The following is my active list. Pentax 18-135 mm and Tamron 17-50 mm I may get a chance to try it before I buy. Anyway, I will finalize it this week.

Pentax 18-135 mm
Tamron 17-50 mm
Sigma 17-70 mm
Pentax 16-85 mm
Sigma 17-50 mm
One thing to note, the 18-135 and 16-85 are very fast focusing, silent, DC motors.
I don't know if the others are screw drive, but I suspect they all are. You can check them in the lens data base if no one pipes up.
05-25-2017, 06:49 PM   #22
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The Tamron and Sigma 17-50 are screw drive. Sigma 17-70 is DC. It's kind of a toss-up; screw-drive AF lenses seem to almost always have a hard stop at infinity, DC like the 18-135 lacks this, and I don't like that. This is probably my biggest issue with the 18-135 and really is the only issue I can think of that isn't immediately obvious.
05-26-2017, 01:00 AM   #23
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QuoteOriginally posted by normhead Quote
One thing to note, the 18-135 and 16-85 are very fast focusing, silent, DC motors. I don't know if the others are screw drive, but I suspect they all are. You can check them in the lens data base if no one pipes up.
And these two are weather-resistant; the others listed are not. I know the K-x is not WR, but your next body will probably be.

05-26-2017, 08:53 AM   #24
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When buying lenses think long term. Wait and save up if you can't afford at the moment but buy the right stuff.
Tamron 17-50 is best (If you find a good copy and that is a big IF)
DA 16-85 would be the next in terms of FL you are looking for.
DA 18-135 would be a choice as it is a very versatile focal length.

I am surprised DA*16-50 isn't mentioned by anyone. This lens is superior to the options you are considering or have been put up so far by people. There are reviews about Tamron being the best sharpest and all that (If you find a good copy) but Pentax DA* 16-50 or any other Pentax lens for that matter .. their rendering and contrast is second to none obviously better than Tamrons. Now people can argue over sharpness but Pentax lenses are no slouch.

On second thoughts DA18-55 is also the best kit lens between all the camera manufacturers in case you did not know. I would say if you are not ready to make the investment in long term glass get a manual flash for bounced use and start using the 18-55 @f5.6 or f6.7 for the indoor shots you plan to take. You will be surprised how good this lens actually is. I have several shots take with this lens with a bounce flash that I cannot tell them apart from the Tamron lens unless I am pixel peeping.
The other thing worth noting about the K-X is that its LCD is crappy and does not quiet represent the actual quality of the image you are making. So double check that that is not the soul reason behind this lens purchase. See them on the computer and you may not need to upgrade just yet if you chose to go for bounced flash use and keeping your 18-55. K-X does produce beautiful images (although they look crappy on the LCD) even with the 18-55 when that lens is stopped down to 5.6 or 6.7.
05-26-2017, 09:02 AM   #25
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Birds is your big question here. That's the only one where long FL is optimal. I'd set that aside and get a lens designed for long work.
Once you do that, the 16-85 starts to look very attractive, along with the Tamron.

16-135 is one I have, and it's a very useful walkaround lens. It's a bit soft at 135mm but better than I expected. The 16-85 did not exist when I purchased it.
05-26-2017, 09:48 AM   #26
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QuoteOriginally posted by shardulm Quote
When buying lenses think long term. Wait and save up if you can't afford at the moment but buy the right stuff.
Tamron 17-50 is best (If you find a good copy and that is a big IF)
DA 16-85 would be the next in terms of FL you are looking for.
DA 18-135 would be a choice as it is a very versatile focal length.

I am surprised DA*16-50 isn't mentioned by anyone. This lens is superior to the options you are considering or have been put up so far by people. There are reviews about Tamron being the best sharpest and all that (If you find a good copy) but Pentax DA* 16-50 or any other Pentax lens for that matter .. their rendering and contrast is second to none obviously better than Tamrons. Now people can argue over sharpness but Pentax lenses are no slouch.

On second thoughts DA18-55 is also the best kit lens between all the camera manufacturers in case you did not know. I would say if you are not ready to make the investment in long term glass get a manual flash for bounced use and start using the 18-55 @f5.6 or f6.7 for the indoor shots you plan to take. You will be surprised how good this lens actually is. I have several shots take with this lens with a bounce flash that I cannot tell them apart from the Tamron lens unless I am pixel peeping.
The other thing worth noting about the K-X is that its LCD is crappy and does not quiet represent the actual quality of the image you are making. So double check that that is not the soul reason behind this lens purchase. See them on the computer and you may not need to upgrade just yet if you chose to go for bounced flash use and keeping your 18-55. K-X does produce beautiful images (although they look crappy on the LCD) even with the 18-55 when that lens is stopped down to 5.6 or 6.7.
I think the reason that people aren't suggesting the DA*16-50 is the cost, the fear of SDM failure (although you can convert to screwdrive... who signs up for that knowing it's quite possible that they would need to?), and how it kind of lost the comparison test here performed by the PF staff. I mean, why pay more for worse?

It's barely wider on the wide end of field of view than the Tamron 17-50 and it has a WR rating (whatever that's worth here) so it has some advantages, but is it worth over 3x the price of the Tamron, or nearly 3x the Sigma? I vote no. I've honestly thought about stockpiling Tamron 17-50's while they're still available as I think they'll go up in value when new stock runs out at main vendors.
05-27-2017, 03:02 AM   #27
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My first lens I have purchased for K-x was Sigma 17-70 2,8-4.5 Macro non HSM, love it, still have and use it....
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