Antlia ALP-T Dualband 5nm HA & OIII Filter - High Speed Version for f/2.2 - f/3.6 Optics - 2" - ALPT-DB-5NM-HAOIII-HS-2 Antlia Dual & Tri-Band Filters You'll get two telescopes in

You'll get two telescopes in one - one very similar to what Galileo used and a more modern type

5nm Edge Series H-Alpha Filter - 2" Mounted

The barrel is also notched to prevent the eyepiece from falling out of the focuser if the securing thumbscrews become loose

hands-free astrophotography

once attached to the 80ED Focal ratio f/4

Antlia ALP-T Dualband 5nm HA & OIII Filter - High Speed Version for f/2.2 - f/3.6 Optics - 2" - ALPT-DB-5NM-HAOIII-HS-2 Antlia Dual & Tri-Band Filters You'll get two telescopes inAbout the High Speed Characteristics of this Dual Ha OIII 5nm Filter The Antlia ALP T Dual Band 5nm Highspeed Filters are further optimized to work with very fast imaging systems by shifting the passband and center wavelength slightly. Using these highspeed filters with optical focal ratios between f 2. 2 and f 3. 6 shows more contrast in nebulae imaging compared to the standard version of this filter. For f ratios slower than f 3. 6, the standard ALP