14 References

1. Canon (2003), Extension Tube EF12 II/EF25 II Instructions. Canon Inc., Tokyo.
2. Leica (2013a), Leica Summilux-M 35 mm f/1.4 ASPH Technical Data. Leica Camera AG, Solms.
3. Leica (2013b), Leica Summilux-M 50 mm f/1.4 ASPH Technical Data. Leica Camera AG, Solms.
4. Martin Krolop, Anders Uschold (2021), 100 Jahre Kameratechnik, Bonus 02: Warum sind Teleobjektive am Ende flau. Krolop & Gerst, Köln.
5. Harold M. Merklinger (1992), Depth of Field Revisited. Dartmouth, Nova Scotia.
   A short version of a series of articles that first appeared in Shutterbug in 1991-1992. The author wonders why he rarely achieves satisfactory sharpness with the hyperfocal distance, and shows why another focusing strategy gives better results.
6. Harold M. Merklinger (2002), The INs and OUTs of FOCUS: An Alternative Way to Estimate Depth-of-Field and Sharpness in the Photographic Image. Internet Edition, Dartmouth, Nova Scotia.
   An in-depth study of the subject.
7. Hubert H. Nasse (2011), Planar—The history and features of one of photography’s most important high performance lenses. Carl Zeiss, Oberkochen, 5.
8. Gunther Wegner (2017), Diana lernt fotografieren. gwegner.de Verlag, Ahrensburg.
   The basics of photography from a practical point of view. Chapter 4 on image composition is highly recommended, especially for beginners.
9. Zeiss (1997a), Depth of field—An insider’s look behind the scenes. Camera Lens News No. 1, Carl Zeiss, Oberkochen, 3.
10. Zeiss (1997b), Resolution of camera lenses: Where are the limits—and why? Camera Lens News No. 2, Carl Zeiss, Oberkochen, 2-3.
    Limitations of resolution due to diffraction, depth of field, film, and motion.
11. Zeiss (2015), Zeiss Milvus 1.4/85 Technical Specifications. Carl Zeiss AG, Oberkochen.

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