Freakscene
Obscure member
Freakscene: "I was the first of the modern asphericals (the 50/1.2 Noctilux was obviously Leica's first camera lens with aspherical elements) but it was also the first of their lenses to be designed with very rapid focus fall off."
I did not know that you are a modern aspherical!
It was not I was . . . sorry . . . typographical error . . . but I am definitely aspherical ha ha.
I've never heard of lenses "designed with very rapid focus fall off", but I can understand that lenses with a high contrast have less dept of field than lenses with a low contrast. Is that what you mean?
No, I don’t mean that. Modern lens design can be used to control spherical aberration such that it is controlled unequally through the focus distance range. This can affect the rapidity with which focus falls off outside the depth-of-field and softens the bokeh. The 35mm Summilux aspherical (11873) with 2 hand ground aspherical elements (1991) was the first Leica lens designed using this approach.
Aspherical lenses usually have more contrast than normal ones.
That depends entirely on design choices. Lenses follow what manufacturers think we want or, as I see it, we are ‘supposed’ to want. Since the 1950s this has generally been more contrast and more resolution. Following widespread uptake of mirrorless digital cameras this trend has gone crazy, and the current fast primes are extremely contrasty, have very high resolving power and, as a side effect, are huge.
Given current design, manufacturing capacities and ISO ability of digital cameras, a range of f2.8 or 4 lenses with ultra high correction, matched for colour transmission, contrast and very compact size makes a lot of sense, but I can already hear the cries of ‘but they are so slow’.
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