The Nikon D70 is a colour DSLR, you will not need filters as it will take the coloured images for you. Not sure what the EQ5 has on it, but you will need to align it to the SCP very accurately to do the longer exposures needed to gain enough light onto the sensor. If you want to do longer exposures you will need either a cable release or some form of shutter control. The ED80 and the Meades are two completely different scopes, they will achieve very good results. If the EQ5 has an autoguide port then you may wish to use this for longer exposures too.
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