View Single Post
  #1  
Old 29-11-2012, 03:16 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,868
Spectro testing the front Canon filter

Since publishing some tranmission graphs last year which clearly show that the front filter ( the one usually left behind when the colour balance filter is removed for the "mod") acts as a very good UV-IR cut filter, I've been beat up by the guys in the States who say an additional UV-IR "replacement" filter is the ONLY way to go......
Obviously I disagree.
I managed to set up the MG80 spectroscope this morning and test a separate front filter element ( removed from a 1000D).
Surprise, surprise it shows exactly the same...
The attached file gives details.
Feedback and comments welcome.
Attached Thumbnails
Click for full-size image (100_101_comp_small.bmp)
84.4 KB36 views
Attached Files
File Type: pdf Canon front filter test.pdf (78.1 KB, 16 views)
Reply With Quote