Nikon SMZ660 - G-AL Auxiliary Lens

[Aquiles_PT]

Hi all,
i am a new user with a Nikon SMZ660
Need to extend the base magnification of this microscope with G-AL1.5X or the G-AL2X
.
What is the diameter mm of the filter thread? 45mm?
There is any other brand that is compatible with good results Olympus ? Chinese?
The other SMZ older and newer models use the same filter size with other references that are compatible?
.
Thanks

[Scarodactyl]

There are very good chinese copies. I got an smz 745t clone along with a 2x aux that is quite good.