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I've had some correspondence with ngcles a little while ago about the PN's within the bounds of M7. He mentioned that they were very small and a real challenge to see.
I asked Les if the way to actually determine their visual identification is by using the technique of "blinking", which he said "yep". Blinking involves alternating between using an EP with and without a nebula filter. The 'star' that doesn't blink in the switch over is the PN. It's a slow process as you really can only take in a small patch of the FOV at a time to process mentally. Charts are just about a must too.
Hmmm, this blinking technique may be worthy of mentioning in the observing tips...
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