Thanks for the filter info Eric. Yes it is the Baader astro solar film I've used.
I've ordered a .5x focal reducer as my attempt at a full mosaic failed miserably. Although the QHY cam has a larger sensor the image scale being 1.5x larger than my DFK means the fov is not a lot better.
Thanks David I shall rein in the image scale as you say bigger is not always better and I may revert to a mono image as I feel that gives better contrast than trying to produce a false colour.
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