This cheap thing will be
Fun Star.. only mechanical adapter.
You have a lot about it on CN
https://www.cloudynights.com/topic/5...ager-fun-star/
https://www.cloudynights.com/topic/5...2#entry8272541
Probably acceptable for small sensors.. but not very good in light polluted areas (f/2) and for larger sensors (including APS).
So, US$80 is not cheap... wait for ebay, they will be no more than AU$20.