Quote Originally Posted by Roger Thoms View Post
The image is from a paper negative created on Ilford MGIV RC paper. I used a yellow filter taped to the inside of the camera to help keep the sky for blowing out.
A yellow filter would work for panchromatic film; for variable contrast => NO. Variable contrast paper is sensitive to blue and green, the yellow filter would do absolutely nothing to change the contrast in the way you would expect ==> It will not darken the sky. If you want to change the contrast with that paper use the appropriate magenta and yellow filters:

Kodak Grade one filter only
00.....199Y
0.......90Y
0.5....70Y
1.......50Y
1.5....30Y
2........0
2.5.....5M
3.......25M
3.5....50M
4.......80M
4.5...140M
5......199M

Kodak Grade two filters
00.....162Y/0M
0.......90Y/0M
0.5....78Y/5M
1.......68Y/10M
1.5....49Y/23M
2.......41Y/23M
2.5....32Y/42M
3.......23Y/56M
3.5....15Y/75M
4........6Y/102M
4.5.....0Y//150M
5........--

These change the overall contrast, but do not darken the sky.

Steve