There's a couple that I know of:
Some resources for helping with calculations and knowing what eyepieces are available:
Excellent then - good eyes will make viewing more enjoyable.
I had the pleasure of testing my newly acquired TMB planetary 8mm and loved it. Discontinued now, they come up time to time on Ebay and Astromart. Gave amazing views of the moon, best I've ever had.
note: I'm referring to original TMBs, not the Chinese clones. For more reading:
https://stargazerslounge.com/topic/155455-tmb-design-versus-tmb-planetary-ii-clones/
and
https://stargazerslounge.com/uploads/monthly_07_2012/post-9891-0-35700700-1342116603.jpg
in the 2nd link (image), the original TMB is on the left, and the clone is on the right. Note how the text on the barrel is different. The clones are all cheap made Chinese stuff and imho, don't measure up in terms of optical quality to the originals.
an interesting review on CN (CloudyNights) on eyepieces:
note: Billp is renowned as being an expert on eyepieces, and even has written a book:
Cheers!