Serene Life

by garik

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20

The twisting motions you apply to focus and zoom rings are converted to forward and backward movement by helical threads and tracks cut into the barrels inside the lens. This photo shows an example of the threads that do the focusing duties in a partially-disassembled Nikkor prime: Note the tracks cut into the inner barrel and the metal rails in the outer ...


19

There have been stories for years of mail order (and now online) retailers that pull a scam that goes something like this: You respond to an ad for an insanely low price on a lens. They accept your order and bill your credit card. A few days later they contact you to say the exact lens is out of stock, but they will sell you the upgraded version for only ...


8

A simple lens (like the lens in a pair of glasses) forms an image at a distance of f behind the lens for an object at infinity (where f is the focal length). The same lens will form an image at 2f behind the lens for an object 2f in front of the lens. This will achieve 1:1 magnification, i.e. the definition of macro. Thus any single element lens is a macro ...


7

The "elements" and the "blades" are two completely different things. An "element" is a single piece of glass in the lens. Most of what's shown on the diagram are the lens elements. Some elements are colored pink, to indicate that their shape is aspherical. Other elements are colored blue, to indicate that they are made of a special type of glass. Others are ...


5

Never heard of that. While disproving it 100% is impossible, I would be extremely doubtful if Canon make lesser L-lenses. Most likely you are dealing with a shady vendor and you should avoid them. The difference between local and imported versions is usually in the scope of the warranty and documentation language. Know that an import version is local ...


4

It is not just the barrels of high quality lenses. The light boxes of the top tier cameras from both Canon and Nikon are now made of engineering grade composites (i.e. plastic). This includes models such as the 1D X and D4. Why? Because those materials can be engineered to be stronger, lighter, and less sensitive to expansion/contraction with changes in ...


4

The edge of the blade may reflect light. Such internal reflection is certainly to small to produce visible flare but may introduce some kind of blur. Rounding the blades will reduces this parasit reflection. As these reflection may possibly show-up in the bockeh it may be slightly improved. Diffraction will be not be directly affected. I don't know if ...


2

Part of it is due to the grease on the moving parts, yes. On my Canon 70-200mm f/2.8L, I can feel the notches in the gearing. I think plastic parts have more "give" and also wear down slightly to give a smoother feel.


2

Nikon made two versions of the old 70-300. One had a plastic mount, the other metal. However these were not produced at the same time - one version replaced the other at some point. I have never, ever heard of a manufacturer offering a metal mount as an upgradeable option. Definitely smells like scam.


1

I doubt there is much you can personally do about it without risking the warranty on the lens. If your other lenses from the same manufacturer don't have that problem, I'd suggest calling up their customer service and asking about it. Chances are they can help you more than we can in terms of if this is normal and what the best way to get it serviced or ...


1

The "import" you are referring to is also termed "Grey Market". The products marked as "USA" and "Import" are most often identical. In the case of Canon "L" series lenses both will be "Made in Japan" If not then there is a problem: "On the back of Canon lenses is a six-digit code, which indicates where the lens was manufactured and when.Example of a ...



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