What is Reddit's opinion of Celestron 1.25" Star Diagonal, Black (94115-A)?

From 3.5 billion Reddit comments

> I've considered buying a second set of lenses since I only have two, and I'm not sure the ones I have are the best quality. I don't think the lenses I have are necessarily bad, but they are sometimes very difficult to focus and don't seem to get as crisp of an image as another entry level scope I used to have. I found a Celestron lens kit on Amazon for about fifty dollars which comes with lenses and some filters. Is something like this even worth upgrading? I've heard lenses are not bad if they are quality, but have heard mixed things on filters. Some people have said they are a waste.

Those plossl kits are a waste of money. The quality of the Plossls is a bit better than the ultra cheap eyepieces that came with the Gysker, but they're still not great. Even aside from the optical quality, the nature of a Plossl's design is that it's hard to look through in focal lengths shorter than about 12mm. Many of those eyepieces would be tough to use. They would also likely not be appropriate magnifications for the scope.

The lack of clarity you see in your scope is mostly coming from the telescope itself, rather than the eyepieces. The pure optical quality of an eyepiece is like a fart in a hurricane compared to the quality of the telescope's objective. Sure, some eyepieces provide more comfortable eye relief and wider apparent fields of view, but if we're talking about pure, on-axis sharpness and clarity, that is mostly at the mercy of the telescope rather than the eyepiece. This means upgrading to better eyepieces will have a limited effect. Some effect, but limited.

The one thing that might prove to be a decent upgrade is the diagonal. The diagonals that ship with those refractors are generally amici prisms, which allows the scope to be used for terrestrial viewing. But those diagonals are TERRIBLE for astronomy. Even good quality ones are not recommended, and the diagonal is no doubt made as cheap as possible. You might be able to get some better views by upgrading to a typical 90 degree star diagonal: https://www.amazon.com/Celestron-1-25-Diagonal-Black-94115/dp/B00009X3UO/. Just avoid any star diagonal that says "Correct Image", as that will get you right back to where you started.