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For a general understanding of format equivalence, see Format-Equivalent Depth of Field and F-Stop.
The about $2600 Fujifilm GF 23mm f/4 R WR is equivalent to a 18.9mm f/3.3 as compared to a 35mm full frame camera (long dimension of frame). It is thus an ultra wide angle lens that takes medium format as wide as it goes (as of Feb 2017).
- Aperture Range: f/4 to f/32
- 18mm (35mm Equivalent)
- One Super ED and Three ED Elements
- Two Aspherical Elements
- Nano GI Coating
- Linear AF Motor, Internal Focusing
- Dust- and Weather-Sealed Construction
- ommand Position on Aperture Ring
- Rounded Nine-Blade Diaphragm
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
- In-depth lens evaluations covering behaviors not likely to be found anywhere else, based on real-world field shooting.
- How to configure menus and buttons and best operating practices, gotchas and how-to.
- Real world examples with insights found nowhere else. Make sharper images just by understanding lens and camera behaviors.
- Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to 28 megapixels filling up to 5K display, plus large crops.
- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.