What does SLR dog head mean?

The so-called dog head is a general term for economical and practical lenses. Dog head imaging capabilities are average and the aperture is small, making it suitable for beginners. However, dog head imaging is generally better than consumer digital camera lenses.

The opposite of "dog head" is "ox head" and "gold head".

Niutou is a high-priced and high-quality professional lens, such as Canon's red circle L lens. Gold head is Nikon’s gold ring lens. Bull heads and gold heads are very expensive and are generally only suitable for professional photographers.

The kind of head between a dog's head and a cow's head is called a "donkey head". The image of a donkey's head is much better than that of a dog's head, but slightly inferior to that of a cow's head, because it does not have a constant large aperture or the aperture ring is slightly smaller and the lens material , so the price is lower than that of bull head. Generally speaking, it refers to a standard optical lens that is more practical and has better imaging, or a one-lens lens for travel that can be used all over the world; for example, Nikon's 18-200mm, 24-85 and 28-105 lenses belong to the donkey head. The price of donkey heads is generally lower than that of bull heads and higher than that of dog heads. The donkey head is most suitable for amateur photography enthusiasts.