Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-19-2018, 10:08 PM   #1
Emperor and Senpai
Loyal Site Supporter
VoiceOfReason's Avatar

Join Date: Jun 2010
Location: Nashville, IN
Photos: Albums
Posts: 5,913
Light transmission curves for the K5 to K1 cameras. Anyone know where to get them?

Does anyone have or know where I could get the light transmission curves for the K5, K5ii, K5iis, K3, K3ii, K1, K70, and KP low pass filter? I want to see how much light gets to the sensor in the 656nm and 672nm wavelengths.

08-19-2018, 10:12 PM - 1 Like   #2
Otis Memorial Pentaxian
Loyal Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 31,008
QuoteOriginally posted by VoiceOfReason Quote
Does anyone have or know where I could get the light transmission curves for the K5, K5ii, K5iis, K3, K3ii, K1, K70, and KP low pass filter?
All but the K-5 and K-5II don't have low-pass filters.


Steve
08-20-2018, 07:05 AM   #3
Pentaxian




Join Date: Jan 2011
Location: New York
Posts: 4,111
I think the OP wants to know about the combined low pass filter (if present, aka antialiasing filter) plus IR cut filter. Pentax DSLRs without low pass still have the IR cut filter.

Anecdotally, when doing astrophotography I notice that my K-1 blocks hydrogen-alpha 656nm much less aggressively than the K-5 does.

(corrected. 656nm, not mm)

Last edited by DeadJohn; 08-20-2018 at 11:35 AM.
08-20-2018, 07:42 AM   #4
Pentaxian




Join Date: Jun 2008
Location: Idaho
Photos: Gallery
Posts: 645
I can't help on the ones you have listed but I posted the transmission for the K-01 bandpass (UV/IR cut) filter (post #5) which should be similar to the ones you listed. There could be some variation at the wavelengths you mentioned due to manufacturing differences.

UV/Haze filters - PentaxForums.com


Last edited by Bob 256; 08-20-2018 at 07:49 AM.
08-20-2018, 09:17 AM   #5
Emperor and Senpai
Loyal Site Supporter
VoiceOfReason's Avatar

Join Date: Jun 2010
Location: Nashville, IN
Photos: Albums
Posts: 5,913
Original Poster
QuoteOriginally posted by DeadJohn Quote
I think the OP wants to know about the combined low pass filter (if present, aka antialiasing filter) plus IR cut filter. Pentax DSLRs without low pass still have the IR cut filter.

Anecdotally, when doing astrophotography I notice that my K-1 blocks hydrogen-alpha 656mm much less aggressively than the K-5 does.
Yep, that's exactly what I am looking for.


QuoteOriginally posted by stevebrot Quote
All but the K-5 and K-5II don't have low-pass filters.


Steve
They do, but to cut UV and IR only or else they would be giving full spectrum images.


QuoteOriginally posted by Bob 256 Quote
I can't help on the ones you have listed but I posted the transmission for the K-01 bandpass (UV/IR cut) filter (post #5) which should be similar to the ones you listed. There could be some variation at the wavelengths you mentioned due to manufacturing differences.

UV/Haze filters - PentaxForums.com
THanks! Now if I could only get those for the listed cameras. Basically I want to do another astro camera to go along with what I am using, my K1, K3, and full spectrum K-01.
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!
camera, curves, dslr, k1, k5, k5 to k1, light, light transmission curves, photography, transmission
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Are we about to see lenses with metallic coatings that increase light transmission? bossa General Photography 3 02-25-2016 01:39 AM
Naneu Hiking Camera Backpack, anyone know stuff about them? mojoe_24 Pentax Camera and Field Accessories 7 01-20-2015 05:59 AM
"Bogen 22A Special" Enlarger question. Anyone know much about them? pentaxbling Photographic Technique 2 01-21-2014 09:06 PM
UV Transmission data for K7,K5? Nass Pentax DSLR Discussion 5 01-03-2013 05:42 PM
Bogen 22A Special enlarger... Anyone know about them? pentaxbling Digital Processing, Software, and Printing 8 09-30-2009 09:38 PM



All times are GMT -7. The time now is 11:17 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