We present the first morpho-kinematical analysis of the planetary nebulae Kn 61 and Pa 5 and explore the nature of their central stars .
Our analysis is based on high resolution and medium resolution spectroscopic observations , deep narrow-band imaging , and integral photometry .
This material allows us to identify the morphological components and study their kinematics .
The direct images and spectra indicate an absence of the characteristic [ N ii ] and [ S ii ] emission lines in both nebulae .
The nebular spectrum of Kn 61 suggests an hydrogen deficient planetary nebula and the stellar spectrum of the central star reveals a hydrogen deficient PG 1159-type star .
The [ O iii ] position velocity diagram reveals that Kn 61 is a closed , empty , spherical shell with a thin border and a filamentary surface expanding at 67.6 \mathrm { km s } ^ { -1 } and the shell is currently not expanding isotropically .
We derived a kinematic age of \sim 1.6 \times 10 ^ { 4 } yrs for an assumed distance of 4 kpc .
A photometric period of \sim 5.7 ( \pm 0.4 ) days has been detected for Kn 61 , indicating presence of a possible binary system at its core .
A possible link between filamentary , spherical shells and PG 1159-type stars is noted .

The morphology of Pa 5 is dominated by an equatorial toroid and faint polar extensions .
The equatorial region of this planetary nebula is expanding at 45.2 \mathrm { km s } ^ { -1 } .
The stellar spectrum corresponds to a very hot star and is dominated by a steep blue rising continuum and He II , Balmer and Ca II photospheric lines .