Rarinn's Ideas

I wanted to share some of my observations concerning physical limits of photographic equipment. Decades ago 35 mm film was common, and now most photographs are made with slim pocket devices. Dedicated cameras are available, but actually not many people that I know own them (I certainly don’t). It means that popular cheap cameras produced in USSR used film with image size of 36 × 24 mm (864 mm²), while modern marvels of engineering from capitalist China sport image sensors that rarely have bigger size than 8 × 6 mm (48 mm²). Modern digital sensor have better sensitivity and resolution than ancient film made from dead animals (gelatin is an essential ingredient), so some of the problems with small frame size are alleviated. Depth of field, as I will latter show, depends only on the diameter of entrance pupil (for a given angle of view), so having a bigger camera does not mean that range of of distance at which objects can still be sharp is extended. But if reduced depth of field due to...

  To convert solar energy into electricity that will be later used to produce ammonia ( electrolyzing water and Haber–Bosch process ) I propose that photovoltaic thermal hybrid solar collectors (PVT) with compound parabolic concentrators (CPC) mounted on dual axis trackers should be used. cpc_c.ods is my attempt to describe basic parameters of CPC with high-school math (to achieve best results ray-tracing and realistic models of irradiance at various conditions should actually be used).