Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
03-01-2015, 01:10 PM   #1
New Member

Join Date: Mar 2015
Posts: 2
Pentax SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens

I finally purchased a K-3 with SMC DA 18-135mm F/3.5-5.6 WR Lens from ebay. I read some bad reviews about this lens but some said that it might be a bad lens reviewed.
How can I tell if mine isn't a bad one. I personally wasn't satisfied with the few picture taken so far.
Thank you in advance guys

03-01-2015, 01:15 PM   #2
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 51,124
I that particular photo, it looks like you were shooting at a too wide aperture, which caused a lot of the foreground and background to end up being blurry.

As for things to check for, take a photo on a tripod and see if the four corners of the image (when shooting a flat target) are equally sharp.

Adam Webmaster (Site Usage Guide | Site Help | My Photography) server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-01-2015, 04:45 PM   #3
Loyal Site Supporter
Loyal Site Supporter
kiwi_jono's Avatar

Join Date: Dec 2009
Location: Christchurch, New Zealand
Photos: Gallery | Albums
Posts: 2,419
Xajoman, these first images would benefit from a bit exposure compensation (being a bit dark). This will often happen when shooting with a sky background - the camera will try and expose for the background (it does not know what is important to you).

My experience with this lens is positive but it depends on your expectations. For a compact WR lens that reaches from 18 to 135, it is an excellent lens to travel or walk around with. The 16-85 may end up being sharper (we will have to wait for the reviews!) but then its a bit bigger, less telephoto reach and more expensive. One thing about the 18-135 is that it does get soft in the corners of the image at the longer focal lengths (85 - 135mm) but the central sharpness is always pretty good (on my copy anyway) and I know what its limitations are.
03-01-2015, 05:23 PM   #4
Veteran Member
Stavri's Avatar

Join Date: Aug 2014
Location: at a Bean & Leaf
Photos: Albums
Posts: 1,815
There was initially a lot of complaint from buyers of K3's on poor in camera JPG compression when it came out. Try to update the firmware and shoot both in Raw and JPG and see the difference. Also try a different lens, a prime preferably to pinpoint the problem of the camera vs the lens. The K3 is a mid-upper enthusiast DSLR featuring a lot of features and controls, take your time with the camera get to know it and It will render fantastic results.

Last edited by Stavri; 03-01-2015 at 05:29 PM.
03-01-2015, 05:32 PM   #5
New Member

Join Date: Mar 2015
Posts: 2
Original Poster
Thank you guys
I took several photos at different focal length as advised by Adam.
Please take a look.
03-02-2015, 03:43 PM   #6
Senior Member
Pavel_Zhelev's Avatar

Join Date: Aug 2014
Posts: 191
I haven't had a chance to look at the sample images, however if you use f 6.3-7.1 you should be able to get some pretty sharp images with K3/ 18-135 combo. You can take a look at what I have posted on the lens review earlier, please contact me if you have any questions.
03-03-2015, 11:59 AM   #7
mgvh's Avatar

Join Date: Sep 2010
Location: MD
Photos: Gallery | Albums
Posts: 952
QuoteOriginally posted by Xajoman Quote
Thank you guys
I took several photos at different focal length as advised by Adam.
Please take a look.
Actually, what Adam was suggesting is not shooting at different focal lengths (i.e., 18mm - 135mm) but at different aperture settings (i.e., f3.5 - f22). You are shooting at nearly wide open aperture (i.e. f3.5) and that is where you will get your softest pics. You need to close down to f8 or so to get sharper pics.

03-03-2015, 07:46 PM - 1 Like   #8
Kozlok's Avatar

Join Date: Jun 2012
Location: Albuquerque
Photos: Gallery
Posts: 3,104
You need to learn about the exposure triangle. I suggest Peterson's book "Understand Exposure ". It will help you know how to intentionally choose aperture, shutter speed and ISO.

  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
18-135mm, camera, da, da 18-135mm f/3.5-5.6, f/3.5-5.6, lens, pentax help, pentax k3, pentax smc da, photography, smc, smc da 18-135mm, troubleshooting, wr
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: $1000! - Pentax K-3 w/ MC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR tumbleweedlabs Sold Items 10 04-03-2014 08:45 PM
For Sale - Sold: SMC Pentax-DA 18-135mm f3.5-5.6 ED AL (IF) DC WR sholtzma Sold Items 2 02-05-2014 01:11 PM
The NEW Pentax SMC DA 18-135mm F/3.5-5.6 ED AL (IF) DC WR Lens Chuck-B&H Ask B&H Photo! 2 11-24-2010 07:16 AM

All times are GMT -7. The time now is 02:53 AM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]