Serene Life

by garik

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The action of zooming the lens is nearly identical to the action of reloading a pump-action shotgun: slide the barrel forward and backward. Back in the days before autofocus this was the preferred zoom lens mechanism. The two-ring lenses required you to move your hand between the zoom ring and the focus ring which took time. Some preferred the precision of ...


If you don't know what lenses you need and why, don't buy anything. That goes for any camera equipment. The variety of equipment available is immense, as is the range of what it can do and what it is suited for. When you are unhappy with your current equipment, then look into equipment that will solve your then-current issues. I used an 18-200 until the ...


Here is an example image of a 'pump zoom', this is the Canon 100-400mm IS USM:


It just means you push / pull the front of the lens to zoom, rather than twisting a zoom ring. The mechanism is simpler to design/manufacturer but is less precise and has a reputation for sucking dust into the lens due to the large change in volume when zooming.


I recall one of the Canon reps giving a talk at B&H (the talk is on Youtube, but I'm not sure which one; probably the 5DIII/1DX videos) and he addresses the weather sealing. His advice was that it's weather "sealing" and not weather "proofing" so if you need a jacket, so does your camera. Personally, it doesn't matter. This is a somewhat useless feature ...


I use Canon Cameras and at first, I was also in the same dilemma as you. That is until I went shooting with a client in what I considered heavy rain. He just went ahead popped his camera and started shooting, leaving me find shelter. later he explained what I had witnessed, the benefits of the Weather Seal. However, we must remember, these seals are ...


In a word: no. The 18-200mm will suffice. And a single lens is very convenient. However, there may be advantages (mainly in picture quality) in purchasing some other lenses. But remember more lenses can be cumbersome. What you need really depends on what sort of thing you do. From experience I would offer this advice. Stick with your one zoom for now. ...


Some reasons to get lenses with overlapping focal ranges: Larger aperture (allows shorter exposure times in low light conditions, and shallower depth of field) Macro capability (focusing at shorter distance, thus allowing frame-filling shots of small subjects) Better image quality Faster autofocus Smaller size, lower weight


You are not required to purchase any lenses at all. It all depends on your photography needs and what you're willing to spend your money on. Regarding range, the superzoom 18-200 mm covers the same range as the other four lenses you mentioned. All of the other lenses focal ranges are parts of the large range of the 18-200 mm lens. The 18-200 can surely ...


The depth of field in typical "pictorial" settings is dependent only on the f-ratio and the magnification (object physical size / image physical size). When doing close-focus macro work this is not the case any more. So really only the perspective changes, if you stay with the same f-stop, shutter speed, ISO, detector. The artistic effects can be quite ...


Zooming changes the angle of view while keeping the spatial relationship between the camera and the objects in the image the same. Moving changes the spatial relationship between camera and objects, but the angle of view remains the same. Imagine that you're photographing a person that's 10' from the camera, and there's a tree 10' beyond the person, or 20' ...


zooming in on a subject from a distance will allow you to get that blurry background even at a smaller fstop(8) where as if you move closer to the subject you would have to choose a bigger fstop(3.5)


For a non-expensive lens I guess moving closer is better. Imagine you can shoot an object at 70mm at f/4 and if you need to zoom in you are going to down the aperture i.e f/6.3 at 300mm


Either can be the right answer, depending on circumstances. There is no one right or even usually right answer. Moving in will change the relative perspective of objects. Things that are a little closer will appear disproportionately bigger, whereas from further back this size difference due to distance difference is reduced. A great example is getting ...


I now see AJ Henderson's point in the comments. The argument I made in this posting about the exposure is wrong. While with larger focal length (F) the field of view decreases approximately proportional to 1/F^2, at constant F-number N, the aperture is F/N, which means that the total amount of light per unit time on the sensor is proportional to 1/F^2 * ...


On telephoto (and retrofocus, and zoom) lens design: The simple definition of a telephoto lens is a lens that has a focal length longer than the physical lens. Many lenses that are 'long' (as opposed to 'normal' or 'wide') are telephoto in design. This is because it sometimes is impractical to put that much of a barrel on the lens. In the SLR world, one ...


Telephoto and zoom are two completely different things. Zoom simply means that the focal length (apparent magnification) of the lens can be changed, ie, it looks like it can look at things either closer up or further away by adjusting it. Telephoto, roughly, means that the lens has a relatively narrow field of view, thus it can be used to look at things ...


That is simple. Your lens does loose focus on zooming because it is not panfocal. Depth of field: While zooming out you will shorten the focal length which results in a much deeper depth of field. The gain in depth of field sort of compensates for the inaccuracy of focal pane itself. The other way around the focal pane moves in the other direction and ...


The lens is not parfocal in either direction. What you have discovered is the difference between narrow Depth of Field (DoF) at longer focal lengths and deeper Depth of Field at wider focal lengths. The focusing error you introduce when you focus at 18mm and then zoom to 105mm is greater than the shallow DoF at 105mm even at f/8, so you notice how out of ...

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