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Hi Bert,
your 'poor guess' was spot on. The most obvious ones were the two faint rings or partial rings on the left (east) of the chart near NGC 796 and the clusters L 113 & 114. They must be really faint even photographically! My test for this is to download a field from the DSS and to keep manipulating the image to tease out any faint nebulosity. It can take three or so steps to do this. Those two nebulae are very faint and would be a real challenge for any amateur astro-imager for sure.
I'll try the zip form if you like or you can contact me off forum perhaps?
Many thanks in advance,
Ian
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