Combining images from different scopes

An experiment I tried using Paint Shop pro software, combining three images taken using two different telescopes; a 10 inch, f/4.8 reflector and a 4 inch f/6.3 refractor. The final image was then sharpened using manual unsharp-masking. I used a Gaussian blur filter set at a power of 50 and subtracted 50% of the blurred image from the existing image. I used the layer set on difference on Paint Shop Pro 7. I then blended the sharp image with the existing image set on 60 per cent, resulting in the final image.