[glend (Glen)]

Seeking advice from the narrowband imaging experts concerning how far i can image into the astronomical dawn? For example, in the early hours of tomorrow the astro dawn begins at 4:56am, the moon sets at 4:17am. I plan to run Ha and Sii from say 1am, while the moon is still up and Oiii once it sets. Obviously Oiii is going to be impacted by dawn but how 'deep' into astro dawn can i go without influencing the Oiii? Likewise, as the moon is setting can i start Oiii before it is fully set, assuming my target is in the east and the moon is on the western horizon? I am looking for at least an hour of Oiii in this period. BTW there is at least 90 degrees of separation between the moon and the target (M8).