I stand corrected here, I used an orange filter. Regardless, either color, or any other for that matter, may not correct astigmatism. Short of checking, I am sure your right about this. This was 20 years ago, when my technical knowledge was somewhat less than it is now. And considerably less now than many of the members here, I' m sure. At any rate, as I recall, I was advised that an orange filter, with certain lenses, and at specific aperture settings, would improve astigmatic qualities while using B&W negative film. I should say that this advise was directed toward the use of 35mm SLR photography. As a lark, I applied this to the R8 as described in my first post.
Was I completely misinformed about this? I tried a with/without filter comparison with an SLR before my venture into super8 and did see a difference in image quality with the respective negatives.