2024-05-29, 08:35 AM
That sounds reasonable. I was trying to locate my original source for the statements I made. I was perhaps hasty in linking exit pupil to magnification but of course there is a link between the two. You are right however that personal taste also comes in and some people find a UHC type filter better on an OIII filter on the same object and vice versa so it may not be possible to recommend a filter that suits everybody but just a generic recommendation. As you say as well for seeing the fainter parts may require a different filter. A classic example here would be M42 where an OIII filter shows only the central core, the UHC shows more of the wings and then an H-Beta filter shows the outer tendrils well.
With regards to the comment on the H-beta filter made before it really doesn't work that well on small telescopes because they do not push enough light through except in the brightest cases, like NGC 1499 for instance.
With regards to the comment on the H-beta filter made before it really doesn't work that well on small telescopes because they do not push enough light through except in the brightest cases, like NGC 1499 for instance.