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05-30-2018, 01:56 PM   #1
AFrie
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K-20 need a compatible zoom for landscapes

Hi,

I have a K-20 and am looking for a compatible zoom for landscapes- preferably a lens that will hold well around water.
Don't mind paying, but it needs to be compatible

05-30-2018, 02:29 PM   #2
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You have the K20D? If so it is an APS-C camera so any of the F, FA, DA, or DFA lenses would work.


If you need wider then the DA 16-85 would be a good choice. More expensive but faster is the DA*16-50. Another option would be the DA 18-135. For ultra-wide the DA 12-24 f/4 is a good choice.


Have a look at the lens database here: Pentax Lenses - Pentax Lens Reviews & Lens Database


Compatibility is not an issue. All Pentax branded lenses made will work with your camera. You might want to refine your criteria a bit though as there are dozens of lenses that fit the term "zoom for landscape".
05-30-2018, 02:33 PM   #3
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QuoteOriginally posted by AFrie Quote
Hi,

I have a K-20 and am looking for a compatible zoom for landscapes- preferably a lens that will hold well around water.
Don't mind paying, but it needs to be compatible
With very few exceptions (i.e. the 55-300mm F4.5-6.3 PLM), every Pentax K-mount lens is compatible with the K20D.


I would recommend the 16-85mm:
HD Pentax-DA 16-85mm F3.5-5.6 Review - Introduction | PentaxForums.com Reviews


Here are other weather sealed options:
<= 135mm Weather Sealed Lenses | PentaxForums.com

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05-30-2018, 02:40 PM   #4
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There aren't many choices available for the K20D. Pentax makes two that are weather resistant, the DA* 16-50 mm f/2.8 and the DA 16-85 mm f/3.5-5.6. I can't recommend the 16-50 based on personal experience with SDM failures. The 16-85 gets very good reviews. The Sigma 17-50 mm f/28 and the Tamrom 17-50 F/2.8 are also very good but are not weather resistant. Just my two cents.

05-30-2018, 05:30 PM   #5
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I have the Pentax 16-85. The images it provides are very nice. It also is water resistant.
05-30-2018, 05:43 PM   #6
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Not WR but, the DA 16-45mm has been on my K20D thru all kinds of weather and terrain. No worse for wear than any of my other lenses.
05-30-2018, 08:07 PM   #7
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Weather resistant landscape zoom: DA*16-50, DA 16-85, DA18-135 are the choices.


I'd go for the 16-85 for a good compromise of wide-angle versus telephoto and the faster focusing DC motor. If you absolutely need more reach then the 18-135.
05-30-2018, 08:40 PM   #8
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Here are a few other ideas;
DA 12-24
Sigma 8-16
Sigma 10-20 (two versions, 3.5 or 4.5)

06-02-2018, 10:42 PM   #9
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The 20-40 Limited does good landscape and is WR. Might take 'don't mind paying' to its limit though.
06-03-2018, 07:03 PM   #10
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QuoteOriginally posted by AFrie Quote
Hi,

I have a K-20 and am looking for a compatible zoom for landscapes- preferably a lens that will hold well around water.
Don't mind paying, but it needs to be compatible
When I was a Canon user, my favorite lens was my Sigma 10-20mm f/4-5.6, so I was over-joyed to be able to purchase the K-mount variant at the Marketplace here; the AF is screw-drive {the Canon version had an in-lens motor, of course}, but it is good for providing an intimate view of something like a swamp {my use seven days ago}. It isn't WR, but that is OK with me.
06-07-2018, 04:23 PM   #11
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I can definitely recommend the DA 16-85. I still have my DA*16-50 but the field curvature is not the best for landscapes. The borders on the 16-85 are just better. For me this is the best walkaround weather sealed zoom lens for Pentax ASP-C mount cameras. For non weather sealed options there are many. Sigma 17-50, Tamron 17-50, Pentax DA 16-45, Pentax DA 17-70, ultra wide options: Pentax DA 12-24, Sigma 10-20 (2 models), Tamron 10-24. These are just the most offerings in autofocus lenses. If I were to include all the older legacy lenses I would be typing for hours. Excluding the new DA 55-300 PLM lens, if it is a Pentax K Mount lens it fits. Since this goes back to 1975 the list is quite long. However of all the lenses I used going from my K10D to my K3 the DA 16-85 has been the only one that just impressed the heck out me. If it died tomorrow I would either fix it or replace it. The only lens I have that compares is the DFA 28-105, but that is full frame and the wide end is really too narrow on ASP-C.
06-18-2018, 08:56 PM   #12
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QuoteOriginally posted by wtlwdwgn Quote
There aren't many choices available for the K20D. Pentax makes two that are weather resistant, the DA* 16-50 mm f/2.8 and the DA 16-85 mm f/3.5-5.6. I can't recommend the 16-50 based on personal experience with SDM failures. The 16-85 gets very good reviews. The Sigma 17-50 mm f/28 and the Tamrom 17-50 F/2.8 are also very good but are not weather resistant. Just my two cents.
Did you mean "aren't many choices" compared to other Pentax bodies?
06-19-2018, 04:48 AM   #13
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QuoteOriginally posted by tibbitts Quote
Did you mean "aren't many choices" compared to other Pentax bodies?
The OP wanted WR wide angle zoom lenses. How many are there?
06-19-2018, 09:15 PM   #14
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QuoteOriginally posted by wtlwdwgn Quote
The OP wanted WR wide angle zoom lenses. How many are there?
The way you worded it sounded like you meant there were fewer available for the K20 than for some other Pentax, but yes if you want WR the selection is limited no matter what Pentax body you have.
06-22-2018, 06:03 AM   #15
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The newer versions of the 18-55 are pretty good if you're on a budget - better than the version which came with the K20. Getting much wider than 16mm is going to be a bit more expensive. WR will limit your choices.

The 16-45 worked great on my K10. I would take it out in the winter, but not if it was snowing. The 18-135 became my default bad weather/risky situation lens.
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