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As for what concerns the views with different filters, the point is that if real red exists in one spot, it must be seen with both methods. I understand that red was seen in spots far away from the huygenian region with the red-leaking filters, the same spots were not visible at all in the red filter (red seen in the huygenian region and somewhat away it). Am I wrong?

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Yes, you are wrong. With the single-passband red filter (Wratten 23a), red was seen in the Huygenian region *and* the area around it (as well as in the parts of the inner "wing" sections of M42 that are fairly bright) . With the dual passband filters (NPB narrowband, red-leak OIII and red-leak H-Beta), extensive red was not seen in the Huygenian region itself, as most of that appeared a greenish-blue color. However, reds *were* seen in various parts a little outside the Huygenian region, as well as in sections of the "wings" and in some other parts nearer to the outer boundary of the nebula. With the *single* passband OIII line filter or with my older Orion Ultrablock narrowband filter that has no red passband, no red was seen at all anywhere in the nebula (only bluish-green color).

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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info

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