In astrophotography, I would say 70% is technique and 30% is the equipment. I spent a lot of time learning the technique behind those incredible images of the galaxies, Zubuyer says ...
Definition: An achromatic lens can be defined as a lens which is made by a combination of two different types of lenses carrying different focal powers in a manner such that the images formed by the ...
A triplet lens is cemented by one piece of crown glass with low refractive index and two pieces of flint glass with high refractive index, normally the cemented lens can eliminate spherical chromatic ...