Monochromatic morphologies of Abell planetary nebulae

Monochromatic (Delta lambda less than or equal to 10 Angstrom) images have been obtained for seven large (2 - 10 arcmin) Abell planetary nebulae. From this deep survey, eve found 4 to have normal bipolar shapes, whereas 3 hav e truly spherical shells. The structures of these nebulae are discussed usi ng the absolutely calibrated intensity maps in H alpha, [N II]: and [O III] . An attempt to derive ionized mass using our (dereddened) measured absolut e flux as a function of distance to the PN is also given.