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Hi Dennis and Peter,
Visually I use the semi-apo alone a lot but it seems so much better with the yellow filter for really bright objects (moon / planets). Really effective alone for deep sky.
With the moon visually I find the semi-apo causes a little bit of fringing near the terminator due to the high contrast - whereas adding the pale yellow too makes it sharp as a tack. Also eliminates that little bit of purple fringing still present around the moon with the semi-apo alone.
The photo here is exactly as it was straight from the camera. Thought it would give a better impression of the effect of the filter combo.
Cheers
David
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