Call me crazy (come on, you won't be the first to do so). Last night I had my 14" Edge set up to do some Jupiter, Saturn and Mars viewing. But while waiting for those to get high enough for good viewing with the high humidity clouding the atmosphere and the African dust not helping the situation either, I visited some deep space objects. On the planetary and emission nebula I was using either my Lumicron UHC or O-III filters. I used to have a Celestron O-III filter and to be honest, on the Western Veil nebula it actually showed more of the feathery nebula towards the end of the nebula because it blocked more of the unwanted light (in my atmospheric conditions anyway). FYI, I was using my ES 40mm eyepiece for around 97 power. And for equipment description, I use a Williams Optics 2" diagonal threaded to the back of the scope and the filters are 2 inch.
For laughs, while the O-III filter was screwed into the eyepiece, I passed the UHC filter between my eye and the eyepiece basically stacking the filters. That seemed to bring out a little more of the feathery end of the Witches Broom. I then tried to stack the filters but Lumicon chose not to thread the filter housing for stacking.
So, was it just my imagination the the 2 filters stacked could bring out more of the fainter nebulous region of the Western Veil? And if that would work, how could I go about stacking the filters?