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Goran,
You can do this but I don't think you will have enough light to avoid very long exposures if you only have 80 mm to start with. I have used a 2X Astrophysics barlow with my TEC140, so almost 2x the aperture. If you look at my site (below) the imags of M83 and M16 were both taken this way. Also over 1000mm and you probably should be using OAG.
Peter
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