What lens is not suitable for photographers?

Alas ~ ~ ~, dare to write our mother tongue more clearly?

What kind of lens is not suitable for portraits?

This question is inconclusive.

Because the portrait effect taken by different lenses is completely different.

This needs to be determined according to your shooting requirements and the emotions and connotations that need to be expressed in the shooting works.

Shooting a portrait with a medium telephoto lens or a telephoto lens can blur the background and highlight the effect of the subject. Generally speaking, most beautiful portraits are shot with this lens.

Wide-angle and ultra-wide-angle lenses can capture relatively exaggerated visual effects due to the distortion caused by lens characteristics.

Lenses are classified according to focal length:

A lens with a focal length less than 20mm belongs to a super wide-angle lens.

A lens with a focal length of 20 mm to 45 mm is a wide-angle lens.

A lens with a focal length of 45 mm to 65 mm is a standard lens.

A lens with a focal length of 65mm~ 135mm belongs to a medium telephoto lens.

A lens with a focal length of 135mm~300mm is a telephoto lens.

A lens with a length of 300mm~ or more belongs to a super telephoto lens.