neural 寫:
Just compare cosina 21/4 and Zeiss 21/4.5.
You still believe cosina 21/4 is different from zeiss "NEW DESIGN" 21/4.5?
You still believe it is a "NEW DESIGN"?
Or you simply believe everything you are told by Zeiss?
You are right, I can't tell how the elements of these lens are grouped by just looking at the sectional diagram.
But, it just happened that these two lens both have 8 elements grouped in 6 groups, according to offical web sites of these two companies.
I wonder how dirrerent they can be in this situation if we are not discussing this topic in molecular level.
Do I need Ph.D in quantum mechanic, btw?
Actually, it's not my intension to discuss how these lens are named, Biogon or Distagon, I don't care.
All I'm saying is, if Zeiss uses lens design from other company, it shouldn't market the product as if they are original design from Zeiss.
Most of the products branded "Zeiss" are over-priced, given that many of them are designed and manufactured in Japan.
I hope consumers will wake up and do not over-weight Zeiss too much.
em.....I don't know, if the drawing as drawing by Cosina and Zeiss is true, the shape and the thickness of the lens element is different.....It can be a completely new design....
Same case as if you looking at Canon 50mm lens and Contax 50mm lens, you will know their design is the same....but are you dare to say their image output is the same...