I think this is the most frequently asked question in my opinion. It is justifiably so. Lens selection is very important in photography. At times the lens choice can make or break the image in terms of quality or the simple focal length.
I always recommend to first identify what type of photography you’d like to participate in as this will help with the lens choice. If you mainly want to do flower and insect photography a macro lens is a prime choice. If you see yourself as a portrait photographer a 80mm 2.8 is for you as many see this to be a “portrait lens”. You get the point.. This type of analysis will steer you in the right direction.
My first lens was an 18-200 tamron 3.5-5.6. This is a great all around lens. You can go wide when necessary and go long with a simple twist of the lens. This lens provided me with an opportunity to experiment. Shortly after, I decided to purchase the popular Nikkor 18-200 VR 3.5-5.6 due to it’s vibration reduction feature and glass quality above the Tamron in my opinion.

