Being humans, we often overlook, belittle what we already own and look beyond a supposed greener "pasture", hoping that new lens or body will satisfy and make our lives blissful ever after. Not true, no, no. In fact, its the opposite.
Take for instance our kit lens that comes with our Nikon D90. Its a superb 15-element/11-group glass, with an above average construction and sharpness. But as of all consumer lens, it suffers from a fair amount of barrel distortion and pin cushion. But hey, in my last article, we have learnt exactly how to correct these anomaly with the built-in retouch menu.
To squeeze the very last drop from this specific lens, you must apply the necessary adjustment to correct either the barrel or pincushion distortion at each focal length manually after the picture is taken (read my previous article if you have no idea what I am babbling about here).
If you prefer a perfectionist mindset, use the above to plug it into Photoshop to correct them manually. Alternatively try shooting at 21mm and not 18mm, where distortion is at its minimal.
Equipped with this new fact, you now possess a new lens without spending a dime.