I know there are many articles on cloudy nights about this. I have read a bunch but calculating and figuring this out has been very confusing.

First off, my refractor: 90mm aperture, 910 focal length, f/10. Currently I have a 1.25” diagonal but my new focuser allows me to have a 2” diagonal to use 2” eyepieces. Now, here is my question:

what is the widest view I can get with an eyepiece for 1.25” and 2” eyepieces based on my refractor?

I see a lot of 68°, 82°, and 100° style eyepieces, but I know that with my refractor, some of those eyepieces wouldn’t be utilizing the whole degree of view. So what’s the maximum degree an eyepiece can be for 1.25” on my refractor? What’s the Max it can be with 2” eyepieces? I was thinking of getting an 82° eyepiece but want to make sure I’m not losing out on some degrees because I’m limited by the refractor/aperature/focal length size. Can anybody help clarify this for me?

Thanks