Quote Originally Posted by Cybertrash View Post
For this I thought I might use a blue filter to further enhance the orthochromatic effect, and as blue filters also generally reduce contrast I thought this might be a good match.
Othochromatic means blue and green sensitive.
By using a blue filter you do not enhance the orthochromatic effect, but destroy it.
Instead you'll gain a blue-only effect.

Blue filters do not generally reduce contrast.
The effect of any filter depends on the colour of lighting and the colours of the object.