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Hi Dave, congrats on your perseverance with it. Processing can be quite a steep learning curve to get something worthwhile out of it all.
Light Pollution can be managed with either a CLS ( Clear Sky) filter or one of any other types that minimise the glare.
Unless you are tracking if you are attempting reasonably high magnification you will get star trails at 10-15 secs.
You don't say what sort of camera or lens and settings you are using but most DSLR widefeilds are done with 35mm or 50mm lens so trailing is not apparent for up to 30 secs.
Processing in 32 bit does not have to be done in Photoshop, the latest GIMP I beleive handles 32 bit but I don't use it. I use FITSWORK but it's a pretty daunting and resource hungry piece of software to come to grips with.
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