1. A lens system configured as a doublet comprising: an inner lens structure comprising: an inner positive lens, a first transparent substrate having a first side affixed to a side of the inner positive lens, and an inner negative lens affixed to the second side of the first transparent substrate opposite the inner positive lens; and an outer lens structure comprising: an outer positive lens, a second transparent substrate having first side of the second transparent substrate being affixed to a side of the outer positive lens, and an outer negative lens affixed to the second side of the second transparent substrate opposite the outer positive lens.