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I had to look this one up as I normally refer to it as the Vela Supernova Remnant but yes its Gum 12. Nice work for 1 hour. Gum 12 is not really that dim in narrowband (it is in LRGB) so it does come up pretty well in both Ha and O111 when you have enough exposure time (its quite bright in O111) and your APO is a good wide choice for this target. I did mosaic of this area a few years back with a TEC 110 F5.6 scope and it worked very well.
Greg.
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