When recording thick holograms, Bragg's Law must be taken into account; this imposes additional limitations on the geometry of the recording sources if the reconstruction geometry is fixed. However, the results we have reported from previous papers do not enable the recording geometry required to give maximum diffraction efficiency of the hologram to be calculated for an arbitrary specified reconstruction geometry when there is a possible change in the thickness and refractive index of the recording medium. Bleached silver halide, dichromated gelatin and silver halide sensitized gelatin are well known photographic techniques for phase holographic formation in commercially available emulsion. These techniques are applicable to volume phase formation. This occurs when the refractive index and/or thickness of the exposed/non-exposed portion of the emulsion varies relative to the bulk unexposed portion. We present our theoretical expressions of third-order aberrations in off-axis holographic lenses of different f/No, taking into account the index and thickness variations of the recording materials.