Audubon Bird Call

Audubon Bird CallIf you enjoy birdwatching, this little device is a must. Named in honor of the National Audubon Society by its inventor, it is ingenious in its simplicity. Twisting the birch barrel around the metal plug produces a variety of sounds that will pique the curiosity of most birds; by varying the speed and direction of rotation, you can create a fair imitation of birdsong. Measuring just over 2 1 2" long, its easy to tuck into a pocket before a walk, or

ASI220MM Mini camera integrates 1/1

25 Objective lens Triplet air-spaced APO (including two ED glasses) Distance from the 2" adapter to the focal plane with the focuser barrel retracted 139

Similar materials used in China look and feel the same

This insert is threaded to accept TeleVue's new Imaging System accessories including large diameter extension tubes

Sky-Watcher's Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability

No cables moving during slews and tracking

9 Tripod Weight (lbs) 13

the idea is actually fairly simple

149mm (from the base of M86×1 male thread)

the L-eXtreme filter is dual band that passes Ha and OIII emission lines

Pre-measured TXP polish

star clusters and nebulae