No, but some scopes seem easier to dial in than others.
You're probably aware, but just to cover the base, scopes do have an adjustable ocular focus. What that does is allow you to ensure that the target and reticle are both clearly in focus. I've found that some scope manufacturers adjust this very coarse, and others very fine. So some are "easier" to dial in than others. Some also have a lockring, but the manual should cover all that.
The general ballpark procedure I usually hear is to set the parallax (if adjustable) to infinity, look at the sky, or white wall and adjust the ocular focus until the reticle is in it's best focus. You should be able to close your eyes, open them, and have it be in focus. I expect this is because looking at just sky or a white wall gives your eyes nothing to focus back and forth, and your eyes relax and allows you to just focus the reticle. I often do slight adjustments to this at the range while shooting but it gets me 95% of the way there. The human eye can focus so quickly it's hard to "trick" it with any sort of setup.
The other issue can be the parallax, it's rare but I've seen scopes that once you set parallax out, the target was not in the best focus. In my experience those usually have to go back to the factory for adjustment, IE the ocular adjustment will not fix it.
