Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
03-02-2014, 10:33 PM   #1
New Member

Join Date: Mar 2014
Posts: 6
What neutral density filters sigma 10-20mm? also IR filter 665nm

What neutral density filters should I use for sigma 10-20mm 5.6 dc?

I like landscapes and cityscapes and I am going to Japan so I want to take awesome pix with my k30 and k3. Thanks

Also what about an IR 665 filter for the k30 (I noticed k3 may not be able to shoot IR since it cant see the remote light when doing that test)

Is an IR 665 filter see through like 590nm so one wont need a tripod for light and long exposures?


03-03-2014, 01:43 AM   #2
Site Supporter
Site Supporter
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 10,358
A 665R filter is basically a red glass filter, it would pass considerably more light compared to a RM90 filter. There is some academic debate on this but for photogrtaphic purposes the NIR spectrum starts around 720nm, these filters are almost completely opaque to visible light. Be warned, these dark IR filters are rather expensive.

QuoteOriginally posted by erik_corrxx Quote
I noticed k3 may not be able to shoot IR since it cant see the remote light when doing that test
the K5II(s) and the K3 both have exceptionally strong UV-IR cut filters in them, I detected a stop and a half reduced sensitivity compared to the K7, and nearly three stops compared to the K10D.

  • 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!
10-20mm, density, density filters sigma, filter, filters, ir, k3, k30, light, thanks, tripod
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Neutral Density Filters and DoF MadMathMind Troubleshooting and Beginner Help 4 01-26-2014 08:47 PM
neutral density filters shaolen Pentax Camera and Field Accessories 3 08-12-2013 10:44 AM
Neutral Density Graduated Neutral Density Filter questions tessfully Pentax SLR Lens Discussion 36 04-11-2013 07:01 AM
Neutral Density Filters pearsaab Pentax SLR Lens Discussion 17 08-31-2012 08:15 AM

All times are GMT -7. The time now is 05:58 PM. | 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]