Category Archives :Telescope
Difference Between APO & Achromatic Lens Under Diffraction Ring
- Mar 20,2020
- svbony
- 0 Comments
- Telescope
Test the APO and Achromatic, make sure the difference under diffraction ring, SV305 doublet is quality achromatic lens with SPL-51 ED glass. ...
How to get started with Astrophotography
- Feb 20,2019
- svbony
- 0 Comments
- Telescope
Do you want to take astronomy photos? Here are the basic tips of how to get start with astrophotofraphy. ...