  We present a plenoptic microscopy configuration for 3D snapshot imaging,
which is dual telecentric and can directly record true projection images
corresponding with different viewing angles. It also allows blocking high-angle
stray rays without sacrificing the light collection efficiency. This
configuration named as snapshot projection optical tomography (SPOT) arranges
an objective lens and a microlens array (MLA) in a 4-f telecentric
configuration and places an aperture stop at the back focal plane of a relay
lens. We develop a forward imaging model for SPOT, which can also be applied to
existing light field microscopy techniques using an MLA as tube lens. Using the
developed system, we demonstrate snapshot 3D imaging of various fluorescent
beads and a biological cell, which confirms the capability of SPOT for imaging
specimens with an extended fluorophore distribution as well as isolated
fluorochromes. The transverse and vertical resolutions are measured to be 0.8
$\mu$m and 1.6 $\mu$m, respectively.
