Now this might be a really dumb question, but here goes. I recently got hold of a Seleco SDG 700 to replace my ailing Barco 701s. (It worked out cheaper than replacing all three tubes) However, I've ended up with a smaller picture because of my limited throw (12Ft) Now I know I should have checked etc etc. But my question is are the HD145 lenses on the Seleco going to be the same focal length as the HD145 lenses on the Barco? If they are different would changing them bring my picture back up to its original size? Thirdly would it be a sensible thing to do or am I entering a world of pain? Any help sincerely appreciated.