Find astrophotographer to test Optolong F2 filter

[Cathy Huang]

Hello
This is Cathy Huang from Optolong Optics Co.,Ltd.
As Optolong F2 will coming,if you has fast astronomy equipment,welcome to test our F2 filter,thanks for you

[Zbych]

I watched it through L-eXtreme and it was totally awesome! I assume this is the correct treatment: https://www.researchgate.net/publicatio ... Evaluation