Erwin Puts, On lens reviews

Erwin Puts, Classical topics (long read)

Erwin Puts, Three generations of optical design: Berek, Mandler, Kolsch

Erwin Puts, Reflections on current optical designs

Erwin Puts, Lens testing and lens design in the digital age

Erwin Puts, Chromatic aberrations

Roger Cicala, Have You Seen My Acutance?

Roger Cicala, MTF – The English Translation

Roger Cicala, Some M-Mount Field Curvatures

Roger Cicala, There Is No Perfect Lens Test, Either

Nasim Mansurov, How to Read MTF Charts

Nasim Mansurov, What is a Decentered Lens?

Nasim Mansurov, What is Chromatic Aberration?

Nasim Mansurov, What is Spherical Aberration?

Nasim Mansurov, What is Focus Shift?

Nasim Mansurov, What is Lens Distortion?

Nasim Mansurov, The Effect of Dust on Lens Bokeh

Spencer Cox, What Is Lens Diffraction?

Rangefinder Forum, Optics theory