Meniscus lens
Is a simple lens consisting of a single piece off glass, thicker at the center than at the edges. It has one concave and one convex face.
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Meniscus Lens
A lens that is concave on one side and convex on the other
Memory Stick ...
The outer lens elements of the two lens groups are concave meniscus lens elements, the inner lens elements are convex meniscus lens elements, made of another glass sort. This lens construction reduces effectively radial distortion.
The meniscus lens, superior to the bi-convex lens, improved the quality of the the projected images.
For the Schmidt it's an aspheric element, for the Maksutov it's a deeply curved spherical meniscus lens. Looking at the Tamron it appears to be a Schmidt.
They have an achromat pair at the back and a large meniscus lens at the front. The combination gives a peculiar result in stopping down.
It was only 2½ inches tall. It uses a simple rotary shutter with meniscus lens, and does not have a viewfinder. The photographer must use the leatherette covering to attempt to see the subject of the photograph.[9] ...
 See also: Lens, Camera, Photograph, Image, Film
  
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