FWIW,
I've used the standard scope without the 90 for years, however, Santa left my own unit a couple of weeks back and it came with the 90 degree adaptor. It adds a great deal of versatility to the bore scope from my limited usage. Places previously unworkable are now doable. That said I had 20% off of dealer discount from Brownells and it made it hard not to go that route. Had the membership on this board not given me the straight dope on this item I'd likely have the supernova light. As was passed along to me by the Gentlemen here the standard light is more than enough. Moral of the story I've found the validity of responses here to be excellent... Off topic. Apologize. Regards, Matt Garrett