What is Reddit's opinion of SVBONY Telescope Eyepiece Fully Mutil Coated 1.25 inches Telescope Accessories Set 66 Degree Ultra Wide Angle HD 15mmfor Astronomy Telescope?

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That's a beast of a refractor.

A few things:

1. It has a 2" focuser, so it can accept 2" eyepieces for lower power, wider angle views. I don't know if yours came with a 2" diagonal, but one of the first things I would do is upgrade to a reasonable quality 2" diagonal, such as the GSO quartz dielectric. This will let you use low power, wide angle eyepieces.

2. Given the long F/8 focal ratio of this scope, I would recommend something like a 38mm Orion Q70 or 42mm or 50mm GSO SuperView. This will get you close to the widest true field of view possible in the scope. Note that these are 2" eyepieces so they will require the 2" diagonal. The 42mm or 50mm SuperViews will also get you around the brightest useful exit pupil, which can be useful when paired with a nebula filter such as a UHC or O-III - good for targets like the Orion Nebula or Lagoon Nebula.

3. For moderate power DSO viewing, you would want something around 16mm in focal length - the wider the apparent field the better. The 15mm "gold line" will be a good choice without spending too much money. Use that for viewing medium sized deep sky objects and galaxies.

4. For planetary viewing, the 9mm and 6mm from that set would also be good. In fact, the whole set for $110 + one of the wide angle 2" eyepieces I mentioned above would basically have you completely covered. The 20mm from that set can replace your 20mm Plossl, giving you a wider apparent and true field of view than the Plossl.

5. I would also consider upgrading the finder scope to a RACI like this one: https://www.amazon.com/Orion-07212-Right-Angle-Correct-Image-Finder/dp/B0000XMVE0. When the telescope is aimed at high angles, looking through a straight-through finder basically requires you to sacrifice some of your neck vertebrae. A RACI makes finding and centering objects a LOT easier. Even though the scope has Go To capabilities, you still need to center it on some stars for alignment, and that task alone through a straight-through finder can be excruciatingly annoying. Go To is not always perfectly accurate either, so it's worth having a comfortable finder scope.