Michael, beautiful photo of your daughter with you E55 Summicron-R 50mm. I believe this lens has the same, if not identical, optical formula of the Summicron-M 50mm (pre APO). As you're looking for other R lenses, the latest Elmarit-R 90, is also an excellent performer and can be had very 'cheaply', which also share the same optical formula with the Elmarit-M but with 1/3 of the M price.