it’s not that simple. It’s the quality of the actual glass. All my lenses are made by Nikon or NIKKOR. and, the quality of the camera. my lenses are sharp all the way from one end of its temperature range to the other. It relates to how many elements are in the lens and how well constructed they are. It’s easy to make a lens do with his post to do, it’s hard to make it do it right. that’s why lenses cost thousands of dollars.

Every lens is made up of multiple different lens elements. Each element affects the light as it passes through. With expensive lenses, the manufacturers go to great lengths to use the highest quality techniques and materials to minimize any chromatic aberration, distortion or vignetting from how the elements interact with the light as it passes through. Expensive lenses also tend to be sharper across the entire image for the same reason. With cheaper lenses, manufacturers can’t afford to invest as much money in materials or research. They try to do their best, but compromises must be made, and image quality is one of the things that suffers.

I would be the first to admit that my iPhone takes amazing pictures because the metering is phenomenal. But that does not make up for the quality of the glass. The best camera you have is the one you have with you.

It is all in the glass. all my lenses are F2.8 or better.