DSLR Lens Buying Guide: Which Lens Should You Buy

Most of the people have an unclear idea about DSLR photography. However, they can take photos with their phone camera or any point and shoot camera brilliantly. DSLR means Digital Single Lens Reflex. This is a special type of camera which can take photos of an object with all types of details. So, the photos become very eye-soothing and attractive. If you have decided to buy a DSLR Camera, then the first thing which will come in your mind is, which lens should I buy? You will search and find that there are hundreds of DSLR lenses and you be like being in an ocean finding a gem! To solve your confusion, sujonhera.com is providing you the solution in the form of this post. This DSLR Lens Buying Guide will help you before buying your desired lens. So, let’s start the discussion.

DSLR Lens Buying Guide Which Lens Should You Buy


Most of the people think that the KIT LENS (the one which remain in the box with the DSLR Camera) is enough for normal photography. Well, they are partially right. Most of the kit lenses are the 18-55mm zoom lens. So, you can only take a photo of this range. You can’t take a zoomed photo of a flying bird or a mosquito with it. Now, you must be thinking, what is a zoom lens? Well, I will discuss it later. Just keep reading and you will find your answer. So, you should not be contained with the kit lens. You need at least 3 lenses to cover all the ranges of objects for your photography. They include a prime lens, a telephoto zoom lens and a zoom lens of 18-135mm for normal use. Now, you must be thinking, what is a prime lens and what does it mean by these mm things, right? OK, I am answering the basic information now.


With a zoom lens, you can take a photo by zooming. You must know what is zoom. You have taken photos with your phone camera or any digital point and shoot camera by using the zoom in button. In a DSLR camera, you don’t have a zoom button. Rather, your lens can be rotated to zoom in and zoom out the object. The zoom lenses are designed with the capacity of zooming. So, it is called zoom lens. It can change the focal length within a given range. And that range is named with the lens name. For an example, 18-55mm lens means, it can take a photo of an object from focal length 18mm up to 55mm. Zoom lenses usually have a smaller aperture than the prime lenses. So, they can’t take a detailed photograph like a prime lens. Let’s look at the below photo. The 18mm box is showing the area which will be captured if the lens is kept as 18mm focal length. And if it is zoomed to 55mm, the area of the photo will be reduced to that of the innermost box.


Prime lenses don’t have zoom capacity. That means you can’t zoom in an object which is far from you. If you want to take a zoomed photo of that object with your prime lens, you have to move with your camera and reach that object to get a closer view. Prime lenses are used for portrait photography. In other words, it can be expressed as closer photography. These lenses have a larger aperture than the zoom lenses. So, it allows more light to enter the camera and results in a good photograph with maximum details. For an example, Canon f1.8 50mm lens is a prime lens. You will see one number before mm in a prime lens. There will be no range like 18-55mm in its name. So, you can identify the prime lens and zoom lens  by this easy method.


You will find some lenses called Wide Angle lenses. Usually, those with a focal length below 30mm are called Wide Angle Lenses. With these lenses, you can capture a large area. So, it is named as wide angle. On the other hand, some prime lenses are named as Narrow Angle Lenses. Usually, lenses of more than 30mm focal length are called Narrow Angle Lenses. With these lenses, you can only capture a small area. Note that Wide & Narrow Angle Lenses may be both prime lenses or zoom lenses. Some examples:

10-24mm lens is a wide angle zoom lens.
20mm lens is a wide angle prime lens.

75-300mm lens is a narrow angle zoom lens.
50mm lens is a narrow angle prime lens.


You will see some abbreviations like IS and VR in the lens names. In fact, IS=VR. IS=Image Stabilization, VR=Vibration Reduction. Canon lenses are named as IS and in Nikon lenses, it is called VR. Some of the zoom lenses are named in this fashion. In fact, when a photo is taken by zooming, a slight shaking of your hand may cause a more blurred image than the prime lenses. If the lenses have IS or VR, then the shaking is minimized and the photos don’t become blurred. So, Always prefer IS or VR lenses.


Aperture is the pore through which light enters into the lens. So, larger aperture will allow more light to enter and result in brighter and detailed image. On the other hand, smaller aperture will allow less light and result in darker images. Aperture is mentioned as f-stop number in lens names. The more f-stop number means smaller aperture. The less f-stop number means larger aperture. So, it is the totally opposite. Just remember it. For an example: Canon 50mm f/1.4 lens has a larger aperture than Canon 40mm f/2.8 lens.

In some lenses, you will find a range in the f-stop number. Such as 18-200mm f/3.5-6.3 lens. Here, the aperture is also changeable. When you keep the lens in 18mm position, it will have the largest aperture of f3.5 and when you keep the lens in 200mm position, it will have the smallest aperture of f6.3.

In some other zoom lenses, the aperture is not changeable. Such as Nikon 12-24mm f/4.0 lens. You can change the focal length from 12 to 24 mm. But, you can’t change the aperture. These lenses are usually costly.

Larger aperture lenses require less amount of time to capture a good image. Because, light enters faster into those than the smaller aperture lenses.


In Canon lenses, you will find these 2 terms. USM=Ultra Sonic Motor and STM = Stepper Motor. Both of these are autofocus motors which allow you to focus an object automatically during a photo or a video. USM is recommended for professionals and STM is recommended for beginners.


After all these discussions on sujonhera.com, I hope you have got a general idea about the type of lens you should buy for your photography purpose. But, for those who have not understood these clearly, I am recommending some lenses here for different purposes to help you.


DSLR Lens Buying Guide Which Lens Should You Buy

1. 18-135mm [Above photo is taken with this lens]
2. 50mm f/1.8
3. 18-55mm


DSLR Lens Buying Guide Which Lens Should You Buy

1. 50mm f/1.4 [Above photo is taken with this lens]
2. 35mm f/2
3. 85mm f/1.8
4. 24-70mm f/2.8


DSLR Lens Buying Guide Which Lens Should You Buy

1. 10-18mm
2. 8-15 mm f/4L [Above photo is taken with this lens]


DSLR Lens Buying Guide Which Lens Should You Buy

1. 100mm f/2.8 [Above photo is taken with this lens]
2. 85mm f/1.8


DSLR Lens Buying Guide Which Lens Should You Buy

1. 75-300mm
2. 70-200mm f/2.8L [Above photo is taken with this lens]

Thanks for reading this post.

The Author

Dr. Sujon Paul

Hello! I am Dr. Sujon Paul. I am professionally a doctor, but love to write blogs and update SUJONHERA.COM regularly with fresh contents. Thank you for visiting SUJONHERA.COM. Contact me on Facebook, Twitter & Google Plus. Don't forget to subscribe SUJONHERA.COM on Facebook, Twitter & Google Plus.

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  1. Dada, Nikon D3300 & Canon kiss X7I er moddhe konta valo hobe? Please dada, I am very confused of it. Please ektu janan.

  2. Hello Sir, thanks for such a beautiful & suggestive post. Does Canon 600D body support 75-300mm/Sigma 70-300mm for distance photography? For the same body which prime lens should I buy for Portrait Photography? Please let me know.

  3. Vaia, ami Nikon D5300 DSLR kinbo. Ar sathe 3 ta lens kinte chai. Kon lens gula valo hobe jodi bolten, tahole valo hoto. Because I don’t have any idea about lens.

    1. Read the above post. Then decide which type of lens you need.

  4. I want to buy a DSLR for personal photography. I choose Nikon D5300 or Canon 700D. But, which is good for me? And also say that which lens will be better for background blur in small budget? Have any problem to find various type of Nikon lens in BD?

  5. Vaiya, Canon 70D er sathe kon lens ta normal use er jonno valo hobe?

  6. Ami Canon er prime and zoom lens kinbo. Dhaka er kon jayga theke kinle valo hobe?

  7. Vai, ami new ekta DSLR niyechi. Canon EOS 750D. Sathe lens niyechi 18-135mm AF-S. But, pic tulle background blur hocche na. Eta ki lens er prolemb naki camera er?

    1. Lens. You will get blur background if the focusing object is far from the background and near to the camera.

  8. Chittagong e kon jayga theke nile valo hobe?

  9. I have Canon EOS 600D. Like to capture portrait photographs with blur background. Also like natural environment photography. Which lenses can be better options for me? From where can I buy those? Will it be better to bring those from foreign countries?

    1. 50mm f/1.4 or any portrait lens. See above post for more. From any renowned shop in Bangladesh. If you have such options, then you can use it.

  10. Please, I want to know which lens in good for picture quality Canon 55-250mm IS vs 75-300mm USM for bird and nature picture. My camera body is Canon 750D.

  11. Thanks for the nice post! I want to buy an entry level DSLR. I have been looking at Nikon D5500. I like to travel. So, I want to buy a lens that will cover most things. I prefer portrait, landscape, nature photography. Which lenses should I cobnsider? Is Nikon D5500 good enough for a newbie photographer?

    1. For landscape photography, 10-18mm lens. For portrait, 50mm f/1.4 lens. Yes.

  12. Bhai, 50,000/= taka budget. Nikon 5300 18/55 mm er sathe 55-200 mm lens nibo? Naki ekbare 18-140 mm ekta lens nibo. Canon er lens er price ki kom compared to Nikon? Amar Nikon valo lage. Apnar suggestion cacchi.

    1. It’s totally your choice. If you need to take photos of distant objects like birds, you need 55-200 mm lens. Otherwise, you can buy the 18-140 mm, which is a good choice. Prices vary from time to time. So, it’s not correct.

  13. Vaiya, just got admission into college and decided to buy a DSLR. By which lenses I can shoot background blurred images? Thanks in advance.

    1. Any DSLR lens will allow you blur images. But, you have to decide which type of photography you want to do. Read the above post to get an idea about it. Then you will know which lens will be better for you.

  14. Vai, 28,000-30,000 taka er moddhe jekono brand er DSLR er name bolen, please.

  15. Great Post! But, still doubt in STM and USM difference. Why USM is for professionals & STM for beginners?

  16. Bro, DSLR er use somporke kichu bolle valo hoto. Canon EOS 70D. Jemon, background blur etc.

    1. You can manually blur any object in the photo by rotating the lens. For more details, watch some video tutorials in YouTube.

  17. Vai, ami 1st DSLR kinte chacchi. Budget 40000-45000/= taka. Sudhu body konta valo hobe?

  18. As a beginner onek kichu jante perechi. Onek dhonnobad apnake. Asha korchi, shamne apni aro kichu bishoy niye alochona korben. Jate amader shubdha hoy shikhte.

  19. Bro, ami ei 1st DSLR kinte chacchi. Amar budget price 30,000-35,000 BDT. Now konta kinle valo hobe? Canon naki Nikon? Please model ta bolben.

    1. Canon and Nikon both are good. But I prefer Canon. Start with the entry level camera 1200D. Once you learn DSLR photography, you can buy advanced ones.

  20. For birds photography Nikon 7100 DSLR AFS70-300 will be enough or not? Please suggest.

    1. Hello Brother, will Nikon D3100 camera support 70-300mm lens?

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