Full Frame envy? Focal reducers to the rescue:
a review of the Camdiox focal reducer for Fuji

Full frame cameras, as we well know, are the craze among mirrorless users these days, particularly after Sony released a string of quite affordable models during the last year. If we try to be concise and to the point, these are the main arguments in favor of „Full Frame“ superiority:

  • Inherent ability to achieve shallow DoF
  • Better „light gathering“ capability, resulting in superior ISO performance

Other advantages such as increased dynamic range and color depth are rarely mentioned in relevant conversations. First of all, let’s state it again, just in case Full Frame Junkies weren’t paying any attention the previous one million times this was mentioned: sensor size by itself has no effect whatsoever on DoF. Nada. Zilch. Please re-read the excellent article about different formats at Photographylife. What’s meant by the DoF statement, is that, the bigger the imaging surface (i.e. the sensor, in digital terms), the easier is to achieve shallower DoF with a wider angle of view, at a given aperture. A 50mm lens will provide the same DoF for any sensor, but the larger sensor will give the coveted blurred background effect at a wider angle of view. So, in essence, we have better control of DoF with smaller focal lengths. „Light gathering“ had emerged as something akin to quantum physics‘ „spooky action at a distance“ statement, but let’s try to keep it simple: among similar technology sensors, the larger size ones will demonstrate better results at the same signal amplification („ISO“) values. Which means that, e.g. for a APS-C sensor to reach a comparable image quality, it has to „claim“ approximately one stop ISO over a full frame one………

Source: www.eyesuncloudedphoto.com