Lenses 101
1) Almost every lens manufacturer has three levels of lenses
2) The most inexpensive lenses includes most 'kit' lenses and and other introductory lenses such as the Canon EF 50 F1.8. While many of these lenses are rather good when stopped down a little they are many compromises in the construction to keep the price low, or comparatively low. Some of these lenses are not so good.
3) The next step up is the mid-range price point where image quality is more important but price is also a consideration. Here we will find some very good lenses at what I think are reasonable prices. And example would be the Canon EF 50 f1.4. There are also some very good zooms in this group thet will give almost as good of sharpmess as those in the highest price range.
3) the top professional grade lens here performance and durability is stressed over price and few compromises are made other than those necessary to achieve the optic perambulates for the lens. This would include comparatives necessary for the zoom range in a zoom lens. class of lens also tends to be somewhat faster than the midrange price lenses for example the 85 mm L. lens is an F1 .2 or as the corresponding 85 mm midrange is an F1 .8. If you're shooting in the dark this difference may become critical.
Let's go back to the differences between midrange versus professional grade lenses many of the compromises in a midrange versus its corresponding professional grade lens are in the sharpness and lack of vignetting in the corners of the image. A constant aperture is also sacrificed to keep the price less expensive. If you're using a crop sensor camera, such as the Digital rebel series you do not need to have the sharpness in the corners because you are not including those in the photographs being taken. I think about that for a minute you have a sensor which is smaller than the exposed area on a piece of 35mm film, so why do you need to have the extreme corners and edges a sharp as the center the image?
This means that in many cases you can achieve almost as good of image quality with a midrange priced lens as you can with an L. series lens without the cost.
I'm going to get flamed screamed at and yelled about that statement because many on this forum are in love with her L. lenses which are excellent quality. But in many cases the higher prices lenses may be overkill for a beginner, especially on an APS-c format camera. The 55-250 mm zoom lens is very good introductory price lens. It has image stabilization, it offers an excellent zoom range at a very affordable price.
This is an excellent place for them beginning photographers to start, I would be inclined to learn what I can with the EF-s 18-55 IS and the EF-s 55-250 IS lenses, and they consider what weaknesses you encounter in these two lenses. one of the big weaknesses that I found starting out was the lack of capability to take pictures in low-light situations without a flash. My solution was to purchase a 55 mm F1.4 prime lens and a 85 mm F1.8 prime lens which have proven to be excellent for low light photography, or at lest I think so. As I am a jeweler, I have also purchased a 100 mm
F2 .8 macro lens to use one of photograph items that I've made. These were my choices they might not be wise choices for someone else.
My latest addition to my lens collection is a Tamron 18-270mm Zoom which I will use when I do not want to carry a full camera bag around.
There are many people who will probably disagree with me,but this is my not so humble opinion on lenses.
Wayne
I'm just a simple maker of love charms and tokens,who occasionally takes a picture or two.
Gear list: more toys than I need, Fewer than I want.