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And a question for the owners of the apo-2x with Leica-R lenses. With this extender comes small reserve on the infinity position of the lens? When set to infinity on the lens with an extender is actually at infinity, or a little going into "space"?
My measurements show that it is designed with a small reserve of infinity position. I would like to hear from other owners. Thanks
The APO 2x does not affect the infinity setting of the lenses that do not have the the little extra throw past infinity. For example the 180mm f3.4 APO when set to infinity is all the way to an infinity stop and will still be in focus at infinity when mated with the APO 2x.
With the digital age, some of the lenses may need a slight adjustment to focus to infinity on a digital sensor. It just may be the way Leica set them up for film.
Here was an infinity test with the APO 2x and a 400mm APO, though the 400mm is one of the lenses that will focus past infinity. I have shot the moon with the 180mm f3.4 APO with 2x APO extender and also had good focus.