SVBONY SV48P Telescope, 90mm Aperture F5.5 Refractor OTA for Adults Beginners Bundle with SV231 Color Correction Filter, 2 inches Telescope Filter for Moon Planetary Visual and Astrophotography

The SV231 color correction filter is designed with full thread and standard size to compatible with different types of telescope. High transmittance means high level of transparency, allows a significant amount of light or energy to transmit through it. You can use the SV231filter with SV48P telescope for astronomical observations without color difference to obtain the most exquisite details of lunar craters and planetary surfaces. SV48P telescope features with 2-1.25 inches adapters which is compatible with all 1.25" and 2" accessories such as eyepieces, Barlow lenses, zenith mirrors. Relax the conditions for choosing accessories, making it easier for you to match accessories. The gear ratio of the 2-inch rotatable double-speed focuser is 1:10, so that it is easy to achieve accurate focus. The gear ratio of the dual speed 2-inch toothed focuser with a reduction ratio of 1:10. A combination of constant-speed and fine-speed, making it easy to achieve precise focus.

• Correct chromatic aberration; SV231 telescope filter prevents unwanted color banding in the blue spectral range; minimizes blue wavelengths in out-of-focus areas
• OD＞4; the higher the filter cut-off depth; the smaller the noise and the higher the imaging contrast
• Full thread design; M48x0.75 specification; male thread; thread is not easy to wear; you can overlay other filter to use
• 90 mm aperture; 500mm focal length; compared with 70mm and 80mm; 90mm telescope has more light input and a wider field of view; observe the moon and deep space; which is very suitable for astronomy beginners
• Double speed focuser; the 2 inches rotatable double speed focuser; gear ratio of 1:10; precise adjustability for smooth operation