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normhead · 01-24-2017, 05:24 PM

Originally posted by RGlasel

I don't know of any 18mm lens for an APS-C sized image circle with a flat focal plane.

The Sigma 8-16 is flat rom 16-12 mm. Technically not 18mm, but close.

**DW58** · 01-25-2017, 08:51 AM

Originally posted by Tatouzou

It has been my most used lens since I got it 2 years ago.
IMO the sweet spot is f6.3/f8 between 20 and 70. This lens is very sharp in the center from 18 to 80. But you need to stop it down to get sharp edges. There is field curvature at 18.
At the long end, the lens remains sharp in the center (useful for portraits, where it has a nice bokeh, and for wildlife, as you can crop) but the edges are soft until f10-f11.

The weather has not been co-operating for the most part since I got my K-3. Still experimenting with finding the limitations of my lenses. I appreciate your feedback as it will speed up the process. Thanks.

**arv** · 01-28-2017, 01:53 AM - **2 Likes**

Unregistered User 8 · 01-28-2017, 10:17 PM - **4 Likes**

This little one was flying through the vegetable patch. This lens on my K-3 is so sharp, it allows quite heavy crops and still produces very useable images.

**mattb123** · 01-28-2017, 10:58 PM - **3 Likes**

I'm back in the club as of today. I'll try not to lose this one.
K-3 & 18-135

**arv** · 01-29-2017, 02:37 AM - **2 Likes**

Still processing last summer shots... Another one from Greece

Name: K3__0333_2.jpg
Views: 624
Size: 74.4 KB

mattwoodcock · 02-01-2017, 01:42 AM - **8 Likes**

taken at the snow monkey park in nagano japan using the k-50+18-135

no694terry · 02-03-2017, 08:32 AM - **2 Likes**

one of a new rock i got for my desk tank

royd63uk · 02-03-2017, 12:43 PM - **8 Likes**

Black headed Gull at 135

**Scorpio71GR** · 02-05-2017, 12:10 PM - **2 Likes**

K3 and 18-135, 1/30s handheld, 40mm

**JimJohnson** · 02-05-2017, 12:30 PM - **1 Like**

cross posted to K-3 sports images

AlexBW · 02-05-2017, 02:42 PM - **2 Likes**

Dutch countryside:

**pepperberry farm** · 02-05-2017, 06:12 PM

Stormy Grace

**bobbotron** · 02-05-2017, 07:17 PM - **1 Like**

Wow, there are some amazing photos on here at the moment!

Snapped this earlier tonight at the community bike shop.

Unregistered User 8 · 02-07-2017, 04:28 AM - **1 Like**

I came across this tree during a bushwalk. It amazes me how it not only survived, but was thriving.

K-3 and 18-135.

01-28-2017, 10:17 PM - 4 Likes	#1819
Unregistered User 8 Closed Account Join Date: Mar 2015 Photos: Gallery Posts: 8,694	Zooooommmm !! This little one was flying through the vegetable patch. This lens on my K-3 is so sharp, it allows quite heavy crops and still produces very useable images.

02-05-2017, 06:12 PM	#1828
pepperberry farm amateur dirt farmer Join Date: Dec 2014 Location: probably out in a field somewhere... Photos: Gallery \| Albums Posts: 41,778	K-3 with DA 18-135mm f3.5-5.6 ED AL (IF) DC WR Stormy Grace

02-05-2017, 07:17 PM - 1 Like	#1829
bobbotron Site Supporter Join Date: Jan 2015 Location: Ottawa, ON Photos: Gallery Posts: 3,349	Wow, there are some amazing photos on here at the moment! Snapped this earlier tonight at the community bike shop. Last edited by bobbotron; 02-05-2017 at 07:22 PM.

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01-24-2017, 05:24 PM	#1816
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	Originally posted by RGlasel I don't know of any 18mm lens for an APS-C sized image circle with a flat focal plane. The Sigma 8-16 is flat rom 16-12 mm. Technically not 18mm, but close.

01-25-2017, 08:51 AM	#1817
DW58 Loyal Site Supporter Join Date: Dec 2015 Location: Rural Oregon Photos: Gallery \| Albums Posts: 7,082	Originally posted by Tatouzou It has been my most used lens since I got it 2 years ago. IMO the sweet spot is f6.3/f8 between 20 and 70. This lens is very sharp in the center from 18 to 80. But you need to stop it down to get sharp edges. There is field curvature at 18. At the long end, the lens remains sharp in the center (useful for portraits, where it has a nice bokeh, and for wildlife, as you can crop) but the edges are soft until f10-f11. The weather has not been co-operating for the most part since I got my K-3. Still experimenting with finding the limitations of my lenses. I appreciate your feedback as it will speed up the process. Thanks.

01-28-2017, 01:53 AM - 2 Likes	#1818
arv Loyal Site Supporter Join Date: Aug 2010 Photos: Albums Posts: 415

01-28-2017, 10:58 PM - 3 Likes	#1820
mattb123 Site Supporter Join Date: Apr 2010 Location: Colorado High Country Photos: Gallery Posts: 10,873	I'm back in the club as of today. I'll try not to lose this one. K-3 & 18-135

01-29-2017, 02:37 AM - 2 Likes	#1821
arv Loyal Site Supporter Join Date: Aug 2010 Photos: Albums Posts: 415	Still processing last summer shots... Another one from Greece

02-01-2017, 01:42 AM - 8 Likes	#1822
mattwoodcock Junior Member Join Date: Aug 2016 Posts: 32	taken at the snow monkey park in nagano japan using the k-50+18-135

02-03-2017, 08:32 AM - 2 Likes	#1823
no694terry Veteran Member Join Date: Dec 2011 Photos: Gallery \| Albums Posts: 388	one of a new rock i got for my desk tank

02-05-2017, 12:10 PM - 2 Likes	#1825
Scorpio71GR Loyal Site Supporter Join Date: Nov 2014 Location: Michigan Photos: Gallery \| Albums Posts: 6,031	K3 and 18-135, 1/30s handheld, 40mm

02-05-2017, 02:42 PM - 2 Likes	#1827
AlexBW Pentaxian Join Date: May 2014 Location: Oslo Photos: Albums Posts: 394	Dutch countryside:

02-07-2017, 04:28 AM - 1 Like	#1830
Unregistered User 8 Closed Account Join Date: Mar 2015 Photos: Gallery Posts: 8,694	I came across this tree during a bushwalk. It amazes me how it not only survived, but was thriving. K-3 and 18-135.

DA 18-135 WR, Show us what it can do

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