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Hi Julian, the aperture of a scope has nothing to do with how large an
object will look; it is purely a function of the scope's focal length.
Your Tasco is 900mm, your Saxon will be either 1000mm or 1200mm
depending upon whether it is f/5 or f/6 respectively. If it is f/5 the image will only be about 11% larger than your Tasco gives. The huge advantage is
that the Saxon has enough light gathering power to allow you to use
higher power eyepieces that will produce significantly larger images.
You will also find faint objects much brighter through the Saxon.
You will also get better viewing with a couple of better quality
eyepieces than came with the Tasco.
raymo
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