SV182 Finderscope, 30mm diameter lens provides a bright image through the finder for easy aiming anywhere in the sky; Fully coated, achromatic glass optics yield crisp, bright images. SV191 7.2-21.6mm zoom eyepiece--Maintaining parfocality allows you to run through the focal length range without the need to refocus after each new magnification is set. But minor tweaking is necessary. SV188P Dielectric Mirror Star Diagonal, 1.25in nosepiece fits telescopes with 1.25in focusers. Accepts standard 1.25” eyepieces, filters, Barlow lenses and other accessories with a 1.25in insert barrel. 1.25” moon and skylow is a multi-band pass filter transmitting a high percentage of light in the visual spectrum; the filter enhances contrast when observing brighter objects including the moon and planets. Suppresses skyglow from artificial lighting and background glow reflected from moonrise. This 102mm compact refractor is a dual-purpose telescope for terrestrial and astronomical observation. SV503 telescope is ideal for terrestrial,viewing wildlife, scenery; casual astronomical observation such as the Moon, star clusters and brighter deep sky objects like the Andromeda Galaxy at night.