Am I selecting the right aperture?

Am I selecting the right aperture?

The sharpness of any lens will not be constant, it will change with the aperture, focal length and subject distance in use.  Using smaller apertures can create diffraction blur and larger ones defocus blur.  Every lens will have a “sweet spot” – one particular aperture setting that will produce maximum resolution of the in-focus area and this is usually a few stops down from wide open.  Many users expect the widest aperture to be the sharpest and sadly this is not the case – if sharpness is more important that the depth of field, try finding the sweet spot of your lens and always bear this in mind to get the best balance for your needs.