I have read before about this 50ft adapter for scopes so as to see clearly targets as close as 7m. Tried to google to find out more but all I could find was a Leupold 50ft adapter for one of their older scopes with a small objective. Much smaller than the 60 of the Nikko which is most commonly used in FT. Question is, are these 50ft adapters used only on small objective HFT scopes for 7m targets or are there other 50ft adapters that can be put on bigger objective scopes for FT? Or am I simply confusing things up?