English - Espaņol
Sharpness - Bokeh
with the One Dollar Resolution Chart
Foto tutorial (English)
Foto tutorial (Espaņol)
Equipment recommendations US-ES
Flaat for Canon
Flaat for Nikon
Flaat for the BMC
Flaat for NEX-5N
Old Picture Style Tests
550D video lineskip
APS-C vs Full Frame
Badly assembled lenses and image quality
Lens mount compatibility chart
ISO on different cameras
High ISO on the 5D3
DIY: DR test chart
RGBWK Bayer sensors
Notes on DoF-FoV
Notes on crop-DoF-FoV
Custom Cropmarks for Magic Lantern on the Canon 550D
How many megapixels do I want?
How many megapixels can I see?
Quick Monitor Calibration Chart
For a general methodology description, look at my lens tests.
Here I'll only talk about the changes made for testing my filters (not the ND filters, those are here).
First, a note: this results are not comparable with any of the previous ones, lots of changes in camera, settings, etc.
I used three lenses: a Leitz Elmarit-R 35mm f/2.8, a Leitz Elmarit-R 135mm f/2.8, and a Carl Zeiss Jena Sonnar 135mm f/4, both using fotodiox adapters (from Leica-R and M42 to EOS). I picked these lenses because one is my main lens, the other are the longest lenses I regularly use.
The filters I have tested are the following:
Fotodiox diffuser filter
Hoya CIR-PL circular polarizer (not the HD version)