The Zoomar is coated, but not multi-coated, but still delivers a good performance in terms of lack of flare. Generally, the lens ... 1 stop. At 82mm we have a huge -4.5 stops of darkening at f/2.8 ...
The noise bandwidth of the RC circuit is 1/(4RC). Two formulas are given to estimate the rms thermal noise of resistors and small capacitors. f is the brick wall filter approximation bandwidth Figure ...