camera lens functions

The camera lens function matters the most even if you have been into the world of vlogging or photographs for many years. It doesn’t mean that you have tried all lenses. One bitter reality is that the camera lens is expensive and changing them rapidly will cause a speedy reduction in your money. We have already provided unbiased information about the best DSLR lens but we still need to know about different functions or features of the camera lens.

The choice of our lens may vary according to our needs. If you can afford than must try for different types of lens that may also come fit in your needs and budget. They will also provide you a better and different prospect and composition.

Here we are going to give you in-depth information about camera lens functions and features that you will keep in mind while making a decision to buy. It will help you to get better cameras lens independently and you will be able to make what I called “informed decisions”. 


focal length

One of the foremost important functions of any camera lens is its Focal Length. It is defined as the distance between the image sensor and lens when the object is in focus. Commonly it is mentioned in millimeters, for example, 25mm, 28mm, and 50mm. Whereas Zoom Lens are concerned, both types of focal length i.e minimum and maximum, are mentioned for e.g 18–55.

Focal length plays a major role and this determines the type of the lens, and what objects it will capture or record. The range of focal length varies from a few millimeters and may go up to a meter. The following table will help you with a better understanding of focal length, type of lens, and common subjects.

Wide Angle Lens25mm to 35mmArchitecture, Landscapes & Interior
Ultra Wide Lens - Fisheye8mm to 24mmSkyscape, Artistic & Wide Panorama
Telephoto Lens - Super300mm plusWildlife, Distant Sports Coverage, Astronomy & Nature
Telephoto Lens - Short85mm to 135mmCandid & Portraits
Telephoto Lens - Medium135mm to 300mmAction & Closely Sports Coverage
Standard Lens35mm to 85mm (mostly 50mm)Commonly Used For General Purposes


Crop factor is another important camera lens function and is defined as the difference between your traditional 35mm film frame and the size of the camera sensor. It is mostly and mainly used as an approach to analyzing the focal length of a lens when they are fitted with different types of camera that is of more importance than sound.

Many of us feel that crop factor is complicated and difficult to explain but it’s not so. It is more important to understand its concept rather than ignoring it by assuming its difficulty. Just make a little investment of time for its understanding and once you did it then it will very smooth for you to select the best from the different camera lens.

Mainly DSLRs are using a smaller sensor and this effects cropping off the photograph edges. It results in the more “zoomed in” image than it should be on a full-frame sensor. This crop factor influences it to appear as if the focal length has a more extended central length than it truly does.

Effective focal length can be calculated by multiplying it with the actual focal length of the camera’s “crop factor”. If a  typical camera crop factor is around 1.5x with a 50mm lens then its actual focal length will be 75mm when fitted to this camera.

I hope that this simple method will resolve your problem of crop factor and you will get better results after buying the lens. This will enable you to get the desired outcomes.



Aperture is another decisive camera lens function. It easy to understand then crop factor. Aperture regulates the amount of passing light. The wider the aperture the more will be the light and vice versa. We recommend the low aperture because it will enable you to get capture photos and record shots perfectly with natural and low-light conditions.

A wide aperture is not bad and it enables you to use a shutter speed faster that is used for capturing fast-moving objects or while holding the camera. The disadvantage of having a wide aperture is its cost. Those lens that has a wide aperture are usually expensive than another lens. The best example can be a telephoto lens, the price will go double with an extra stop of aperture.


image stabilization

Image Stabilization is a way to minimize or reduce blurriness in the photos. When you take photos will lower shutter speed, movement of the camera can result in producing blurry images. Image stabilization is an important camera lens function to minimize this by making your shots acute. This will also enable you to record with the slow speed in the absence of a tripod. We have also digital image stabilization that has an edge over the optical image stabilization but its expensive.



Approximately all new cameras are coming with built-in autofocus function but some special lenses may use the manual focus system. You have to check this before purchasing.

Some lenses have more unique and advanced focusing options to accommodate particular needs. We have silent autofocus, which is useful for candid macro photography. The sound of the lens is higher enough to alert the subject and likely wreck your shot.

We have a feature of a camera lens that is known as internal focusing. It is used to focus internally in order to make the still perfect outside the lens. It’s also beneficial in macro photography also where your subject can be scarred by any movement.


weight and size

One important function of the camera lens is size and weight. You must select the lenses according to your situation and the results you intend to produce. Now here comes the size and weight of the lens that you have to consider. You may have to carry heavy and bulky lenses for the desired outcomes so focus on your results irrespective of the physical conditions of lenses.

If you are going to cover events like sports or wildlife shots than you will not be able to get closer to the subjects. You must have to keep yourself at a safe distance. In this case, you need a lens with the best focal length – the longer the lens the better the focal length is, and the longer lens will be large and heavy.

The Aperture has also a small role in the weight of the lens. Wide aperture lens needs heavier internal construction with complexity and this eventually affects an increase of size and weight of the lens. An additional feature like internal and silent focusing will normally increase the weight, especially for a long lens.

The heavier lens is sometimes more beneficial because you don’t have to hand-held them or frequently move them. According to their size and weight, they are coming with tripods or monopods. But remember where it will reduce your physical fatigue, it will also reduce your mobility.

If you are a frequent traveler and you have a need for a long and heavy lens than these lenses may not suit you as they require more space and attention to deal. However, you can resolve this issue by moving to the lightweight lens of the same specification with an extra amount of money.


zoom lens

It’s very easy to understand about a zoom lens and prime lens. Zoom lenses are able to zoom in and out to give a wide range of focal length whereas prime lens has a fixed focal length.

Both of them have some positive and negative points.  Each type has its own benefits and drawbacks. Zoom lenses have low optical quality than the prime lens. They have a wide aperture that made their performance better in low light conditions. On the other side, the zoom lens has a better range of focal length that makes them more flexible and suitable for a subject having a wide range.

Which lens to choose from both of them is entirely dependent upon your professional level and needs. If you are a starter than a zoom lens is a much better choice for you because it will enable you to find much about focal length with experiments. And for a higher level and improved prime lens will be of the quality lens but with low flexibility.


lens fit

Every camera manufacturer has its own and unique design. Lenses are attached to the camera with a kind of mount that locks the lens with the camera. They may come in screw-thread, bayonet, and friction lock. They not only connect the lens with the camera physically but also joint them by connecting them eclectically.

As each brand has its own design, yet they look similar but they are not interchangeable. Each camera manufacturer has its own design, and while they often look very similar, they are not synonyms. Keep in mind this crucial point while purchasing your desired budget vlogging camera. May third party lens producers made and sell the same lens with other diverse mounts to fulfill the need.


We have spent hours of research and bring the unbiased and authentic information for you about the camera lens functions. Based on your needs, you may not get only one lens that will fit in all. We have provided you a table under the heading of focal length, just go through it and you will find the best match for you.

For short-range, you may need another lens than for wildlife coverage. Always consider the light condition but keep in mind that you have to consider the worst light conditions. By doing this you will find a lens that will also cover in other light conditions.

Lastly, if you have a temptation to buy a quality camera lens but don’t have money to buy it then it is highly recommended to wait for the right time and save money for that because camera lens last for the years and can’t be changed quickly so it’s better to wait and go for the quality camera lens.