What are the specific advantages and disadvantages of reflective lens and telephoto lens? What are the specific advantages and disadvantages of paraxial camera and SLR camera? You can get extra points

What are the specific advantages and disadvantages of reflective lens and telephoto lens? What are the specific advantages and disadvantages of paraxial camera and SLR camera? You can get extra points for a good answer! ! 1: Generally speaking, a telephoto lens is a refractive lens. The advantages of refractive lens are adjustable aperture and good automatic performance. The advantages of reflective lens are that it is easy to achieve ultra-long focus, its volume and weight are much smaller than those of refractive lens with the same focal length, and its price is cheap. The disadvantage is that the defocus bilinear is serious, the aperture is fixed, and there is no automatic function, which seems to be fixed focus. But because it will produce a unique annular spot, the Jiao Wai is actually very beautiful if it is used well! The reflector head can only be projected on the focusing plane after at least two light reflections, which is very taboo in the professional field.

2. Serious paraxial is not actually a "not too high-tech" camera. Take Leica as an example, that set of linkage ranging and focusing system is very accurate! Everything is the best. At present, the main reason for the high price of accessory shafts is that there are too few participating manufacturers, and the largest supplier is Leica. Can you count on Maibakh to provide cheap cars? The main difference between paraxial and SLR is the framing method. SLR makes framing and exposure share a light path through a pentaprism system. The advantage is that there is no parallax and what you see is what you get. The disadvantage is that it needs a complex reflection system to increase the volume, which is very difficult to do, and the vibration and noise are bound to be much larger than the paraxial. As for paraxial, it basically has no shortcomings of SLR, but the point of SLR is precisely the shortcomings of paraxial: paraxial has parallax! As for professionalism, it does not depend on the equipment. Photographers are professional no matter what machines they use, and amateurs are amateurs even if they use Hasselblad!