More aperture provide good image with high contrast; ED glass means visible colour aberrations are reduced to minimum with sharp image; all lens surfaces have been provided with multi coated to reduce reflections
Astrophotography with the Barlow lens: Especially for compact objects; sometimes more focal length is required in order for them to be seen at a reasonable size in the image; there is also no shadowing apparent on small image format camera chips
Larger diameter has more scope for lenses: 2 inch diameter allows to insert 2 inch eyepieces into this barlow with double magnification; the large lens diameter also means you will notice no shadowing in the image
52 degree field of view for enjoying observing a large section of night sky; 56mm focal length for low magnifications and an excellent overview
2 inch eyepiece with 2 inch filter thread for high performance