List down the suitable options
First, you should list down the suitable options for lenses. For this, you can check the internet or you can visit your nearest lens shop and ask the salesperson about the recommendations and reviews of different options. On the internet, you can easily search for the available options and their characteristics. Not to mention, you can also read reviews of customers that will be very helpful in narrowing down your options. You should make notes of the brands and models that are compatible with your camera. Most importantly, apart from the compatibility, you should ensure that these lenses can easily fit into your camera.
Consider the type of photography
Depending on the type of photography you want to do, choosing the right lens is very important. Note that the choice of camera lens is highly dependent on what you want to capture. For example, portrait photography requires a shorter focal lens while the landscape demands a camera lens that has a wider angle.
Try all the lenses
To have a better experience, it is strongly advised that you should try all the lenses on your camera and take pictures with them. This makes the comparison relatively easier as you will be able to compare the results of each picture that was taken from the different lens.
Consider your budget
Undoubtedly, a high quality lens will be considerably expensive than those whose quality is average or good. Therefore, you should think about your budget and choose the best available option that falls within your budget but gives you maximum benefit.
Know about the focal length of your camera
The new DSLR models have a different focal length, which makes it difficult for a person to fit it on the old 35mm camera lens.