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What are you using for image registration? You need a program that can perform data scaling. Data scaling, either up or down is required to match the resolution of the other image. A few programs can do this. You simply select the same stars in the different focal length images for the process to calculate the data needing to be manipulated. Personally, I use Registar to do the automate the task. Its takes much of the work out of image alignment/registration and is perfect for mosaics or hybrid imaging (multi resolution). Its best to scale down a high resolution image to a lower wide field image instead of the other way (for obviously aesthetic reasons), however you can go the other way for RGB if its of good quality. Try to plan your hybrid imaging so the higher resolution (longer focal length) image captures key features of interest. Then match it to the shorter focal length image so you can bring out the incredible FoV while still providing amazing detail in the key feature.
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