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In this paper we review and build on the common methods used to analyze nullgeodesics in Schwarzschild de Sitter space. We present a general techniquewhich allows finding measurable intersection angles of null trajectoriesanalytically, and as one of its applications we establish a generalrelativistic aberration relationship. The tools presented are used to analyzesome standard setups of gravitational deflection of light and gain a clearunderstanding of the role that the cosmological constant, $\Lambda$, plays ingravitational lensing phenomena. Through reviewing some recent papers on thetopic with the present results in mind, we attempt to explain the major sourcesof disagreement in the ongoing debate on the subject, which started withRindler and Ishak's original paper, regarding the influence of $\Lambda$ onlensing phenomena. To avoid ambiguities and room for misunderstanding wepresent clear definitions of the quantities used in the present analysis aswell as in other papers we discuss.

On the influence of the cosmological constant on trajectories of light and associated measurements in Schwarzschild de Sitter space