Astronomical telescope is indeed a fixed-focus lens, but it is different from the general lens in imaging. Telescopes have different requirements for chromatic aberration and resolution, such as aberration and spherical aberration. The distance between celestial bodies is too far, and it is boring to spend high cost to correct aberrations. The lens is different, slight aberration is unacceptable …
Both have their advantages and disadvantages. The ability of astronomical mirror to shoot ground targets is weak, and the lens, even a horse gun posted upstairs, can never be used for astronomical observation …
The biggest problem upstairs is the well-known conversion. Not everyone can buy a Quan Huafu digital SLR, so if it's not a full-frame camera, the focal length should be multiplied by 1.5 (Nikon) or 1.6 (Canon), which means that a 1000 mm telescope connected to a Nikon camera is equivalent to a 1500 mm lens …
It seems that you have seen high-end astronomical telescopes upstairs? Some telescopes are not cheaper than white lenses …
To add:
Family photography, family astronomy ... do you think these two things are the same when you buy equipment? Maybe you will buy a camera for daily shooting, but not necessarily a mirror for astronomical observation.
Therefore, it is not bad for us to buy an entry-level telescope of about 2000 yuan. And the fixed-focus lens above 2000 is also good. Canon's red circle and Nikon's gold circle may be used in daily life ... There are also telescopes of this level, such as some reflectors with Marca structure but small aperture. What else is there? Canon's Dabai, or more expensive lenses, also have this level in telescopes, such as Mead LX200LNT series telescopes.
In some applications, such as long-distance shooting, why are there so few super telephoto lenses? Because the lens will give way to the telescope here ... telephoto is their strength.
Of course, there are lenses above 1000 mm, which are used on spy satellites. But uncivilized.
Generally speaking, at the same application level, the equipment used (the price is only one aspect) is almost the same level, just like we use tens of thousands of lenses in sports competitions, and there will be tens of thousands of astronomical telescopes in more professional astronomical observation …
Our purpose is to answer questions, so we can't be too extreme. After all, quarreling can't solve the problem.
Did I mean to deny anyone ... Besides, I didn't misunderstand you. You're right. I just want to say, but I'm not denying you. I want you to know. If you have any questions, please communicate with us.