glasses

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-4

The word lens is from the Latin, shaped like a lentil seed. This is a disk that bulges out of both sides, we call this lens shape, convex – convex. A single transparent convex – convex lens will do the deed. We task the camera lens to gather image forming light rays from a 3 dimensional world (object at different distances) and project their image on a flat ...


3

Take a look at these two Schneider lenses that both have 90mm focal length: The first has coverage for "35mm" format, the second coverage for large format. I am not sure, but I think the main reason for the difference in size is the fact that the large format lens is a "simpler" design, i.e. fewer elements/groups. The reason a large format lens can use a ...


2

A few points to consider (mostly adding to mattdm's answer): A manually focusing 135mm Nikkor 2.8 lens in F mount is about 91.5mm long, and looking at a drawing of the lens most of the optical elements are in the front. So a comparison with a zoom lens isn't really fair -- it is a much more complicated lens. Strictly speaking, a telephoto lens is one ...


19

The focal length is the distance from the (theoretical) center of the lens to the image plane. On the large format camera, there's a lot more camera between the lens and the film. The lenses are also often relatively simple — there's no need for a focusing mechanism in the lens itself, for example. @osullic gives the example of the Schneider PC TS ...


0

I have found Edmund Optics/Scientific to be a good source of different types, quality, and grades of optical supplies for prototyping. I have also used LEGO™ blocks for building various types of cheap lens mounts and component assemblies. The parts are standard, and can be modified for any kind of custom piece. Sugru™ is another wonderful material for ...


0

First, you link to an article about Gaussian Optics which is a specific branch of optics using coherent radiation/light that has nothing to do with conventional photography. That aside, a lens has a "front" and a "back" so there are two of everything since there is one kind of optical point or optical plane for each side of a lens. In other words, the back ...


0

They are made by Cosina Japan, none of that Zeiss moved this and that. they are made in the same plant Voigtlander lenses are made of and same glass. Difference is in the aesthetics and looks. You want a german made lens then buy a Leica. still made in Germany. With Leica you get what you pay for. Zeiss you still get a great lens but not what they use to be. ...



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