Support our Sponsors, they keep FADU free:   AG Photographic   The Imaging Warehouse   Process Supplies   RH Designs   Second-hand Darkroom Supplies  

Notices

Go Back   Film and Darkroom User > Equipment > Filters

  ***   Click here for the FADU 2015/2014 Yearbooks   ***

 
 
Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 19th September 2014, 10:33 PM
Reinhold's Avatar
Reinhold Reinhold is offline
Friend
 
Join Date: Jan 2014
Location: Pacific NorthWest
Posts: 65
Default Filter Spectral Graphs

For those folks who are uncertain which filter to use, here are spectral graphs for various filters.

A filters effect on the photographic negative depends heavily on the type of film you're shooting.
In other words... the emulsion's spectral sensitivity should be taken into consideration when selecting a filter, especially when using non-panchromatic films.

Consult your films data sheet for it's spectral response curve and compare it to each filters curve.

The heavy dark line is the filters transmission on a 360-750nm colored background.
Panchromatic films are more sensitive to the central portion of the graph.
It's here where most contrast filters are used (Yellow-green/ Orange/Red).

If you're shooting paper negatives, the Blue/Green part of the graph is most important.
Yellow/Orange/Red filters are nothing more than safe lights in this case.

The dashed line represents the spectral response for Ilford's Ortho Plus film.
This film can only see Blue/Green light... Yellow/Red filters are mostly useless.

The 380-520nm area defines the spectral response for typical wet plate (collodion) emulsions.
A Blue filter may make focusing easier by blocking out the distracting Yellow/Red component.

Reinhold
Attached Files
File Type: pdf Yel-O-G-B-R.graphs. HZ.pdf (878.3 KB, 1600 views)
Reply With Quote
 
Support our Sponsors, they keep FADU free:   AG Photographic   The Imaging Warehouse   Process Supplies   RH Designs   Second-hand Darkroom Supplies  

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Filter Repair Martin Aislabie Filters 1 6th March 2012 10:32 PM
WTB: Red filter 62mm Domingo Sale or Wanted 0 30th September 2011 06:34 PM
Filter factors Jacques Filters 21 18th September 2011 09:01 AM
swing out filter and arm for de 504 robinb Filters 5 22nd December 2010 05:48 PM
ND filter help please jonsparkes Filters 9 18th June 2010 12:15 AM


All times are GMT. The time now is 05:04 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.