Yes John, I also shoot Efke 50 and Efke 25.
Efke 50 is very similar to Efke 100 - just slower.
Efke 25 has long been one of my favorite films, but it takes some testing and "getting used to." Results with Efke 25 are sensitive to the developer and development procedure employed. Obeying the admonition to "Expose for the Shadows and Develop for the Highlights" is pretty much a requirement for Efke 25.
Efke 100 and Efke 50 are reported to work well with a variety of developers. Kodak X-TOL would probably work well, for example.
I mix my own developers and my personal favorite with all three of these Efke films is Pyrocat-HD.
However, I've also used Rodinal and Crawley's FX-2 with good results.
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