Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-22-2011, 07:51 PM   #1
Veteran Member




Join Date: Jan 2007
Location: Hawaii
Posts: 594
Zoom and Prime lenses for IR?

For those of you that do IR photography with your Pentax cameras, what zoom and prime lenses have you found to work very well with an IR modified camera? My personal experience has been that the original 18-55mm kit lens and the WR version works reasonably well, and so does the Sigma 70-200 f2.8. However, I'm wondering about other people's experiences with other lenses.

12-22-2011, 09:36 PM   #2
Loyal Site Supporter
blackcloudbrew's Avatar

Join Date: Mar 2009
Location: Cotati, California USA
Photos: Gallery | Albums
Posts: 3,816
I concur with you on the kit lens with IR. I can tell you that the DA 12-24, DA 14, DA*55 are not good lenses for an IR camera.
12-22-2011, 09:44 PM   #3
Veteran Member




Join Date: Oct 2010
Location: Hong Kong
Posts: 327
may i know the reasoning why the other lenses may not work as well?
12-22-2011, 10:03 PM   #4
Veteran Member




Join Date: Jan 2007
Location: Hawaii
Posts: 594
Original Poster
QuoteOriginally posted by chickenandavocado Quote
may i know the reasoning why the other lenses may not work as well?
Some lenses have a tendency to have hot spots when used for IR. My Sigma 18-50 f2.8 has that problem. Some aren't very sharp in IR, or can have a nasty flaring problem.

12-22-2011, 10:33 PM   #5
Loyal Site Supporter
blackcloudbrew's Avatar

Join Date: Mar 2009
Location: Cotati, California USA
Photos: Gallery | Albums
Posts: 3,816
HawaiianOnline is correct. I've seen lots of flaring with all three lenses and the DA*55 has a definite tendency for IR hotspotting. It has to do - or so I've been told - with the coatings not being optimized for IR light. That has been my experience with these lenses over the past year or so. It doesn't happen all the time but it happens. Oddly the kit lens seems to be much more resistant to both IR flaring and hotspotting.

This past February, I shot all month with my IR converted K100ds and my Samsung 12-24 (rebranded Pentax DA 12-24). You can see my results here:
Single in February - a set on Flickr
Clearly sometimes it's ok and sometimes it's very not ok.
12-23-2011, 04:43 AM - 1 Like   #6
Veteran Member
creampuff's Avatar

Join Date: May 2007
Location: Singapore
Photos: Gallery
Posts: 3,955
There were previous threads on this topic.

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/66895-ir-infra...tml#post671922

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/33394-lenses-u...otography.html
12-23-2011, 05:59 AM   #7
Senior Member




Join Date: Aug 2010
Posts: 151
Thanks for the links to the older threads, Creampuff. I had been unaware of the lens problems when shooting IR.

I did experiment with a Hoya filter on an unmodified K5 this summer and seem to have missed the problematic glass by chance ;-).
I've been using the DA15, DA35 Limited and M28 2.0 so far, the last one not being mentioned in the older threads, I think - it works quite well.
12-23-2011, 09:35 AM   #8
Loyal Site Supporter
blackcloudbrew's Avatar

Join Date: Mar 2009
Location: Cotati, California USA
Photos: Gallery | Albums
Posts: 3,816
Wow, thanks for the links to those thread Creampuff. Quite helpful. I have to laugh that the kit lens is one of the better IR lenses in all of this. I'd gotten to that understanding in my work with my IR camera. As I haven't had much use for the kit lens in other stuff, it seems that the kit lens will be more permanently affixed to my IR camera now because of this. I'm glad it has found a useful roll. I'm not running the kit lens down, but I've aquired so many other lenses that are better that the kit lens has been gathering more dust and was moving into the sell off list. Thanks.

12-23-2011, 09:46 AM   #9
Veteran Member
creampuff's Avatar

Join Date: May 2007
Location: Singapore
Photos: Gallery
Posts: 3,955
If you guys think IR shooting is only about shooting landscapes, you should view the work of Jakarta based Pentax photographer Kesha (his nick). He's a very experienced portrait shooter and has a good following from his many Singapore based Pentax friends.

K10D Diva InfraRed

Diva Infrared in Studio (5 pics) (Not work safe)
12-24-2011, 12:38 AM   #10
Veteran Member




Join Date: Jan 2007
Location: Hawaii
Posts: 594
Original Poster
Thanks for the links!
12-24-2011, 02:28 AM   #11
Pentaxian
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,797
Also the DA15mm f/4 isn't very good at IR either, it suffers from some pretty bad flare:



not to mention the image quality from the DA15 in the corners is really bad even at f/16 with IR light

Last edited by Digitalis; 01-03-2012 at 02:01 AM.
Reply

Bookmarks
  • 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!
ir, k-mount, lenses, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: Prime Lenses--Macro Lens--Zoom Lens for Sale (CONUS) stl09 Sold Items 16 01-14-2011 04:53 PM
prime vs. zoom a_brooke2006 Pentax SLR Lens Discussion 23 10-23-2010 01:59 PM
Prime and zoom lenses quality difference alphalt Pentax SLR Lens Discussion 16 05-08-2010 03:04 PM
New Lenses v Old for the growing family, prime or zoom!! Help and guidance please. London Calling Pentax SLR Lens Discussion 5 03-12-2008 04:20 AM
Sharpness of K10D RAW Photos Kit Zoom vs Prime Lenses? StevenDeLapp Photographic Technique 19 01-04-2008 08:02 PM



All times are GMT -7. The time now is 12:01 PM. | See also: NikonForums.com, CanonForums.com 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?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top