Sibley's Birding Basics: How to Identify Birds, Using the Clues in Feathers, Habitats, Behaviors, and Sounds (9780375709661)

Sibley's Birding Basics: How to Identify Birds, Using the Clues in Feathers, Habitats, Behaviors, and Sounds (9780375709661)From the renowned author of the New York Times best seller The Sibley Guide to Birds, a comprehensive, beautifully illustrated guide to identifying birds in the field. Sibley's Birding Basics is an essential companion for birders of all skill and experience levels. With Sibley as your guide, learn how to interpret what the feathers, the anatomical structure, the sounds of a bird tell you. When you know the clues that show you why theres no such thing

Low periodic error (< ± 7 arc seconds)

lock knob and counterweight safety stop

3kg Rear-end Adapter Type M42x0

the nebulae are recorded with greater contrast against the background than without it

8" CMOS Sony-IMX662AAQR-C Bayer Pattern R Gr Gb B QE peak 91% Back focus length 12

0' @ 1000 yd / 104

(Diameter = 43mm instead of 50mm)

ASI294MM has a very high QE performance

Solar and Lunar Tracking Modes: EQ North and EQ South GPS: N/A Dovetail Compatibility: Dual saddle plates (CG-5 and CGE saddle) Number of Auxiliary Ports: 4 AUX Ports (Hand Control can use any AUX Port

Knob: Black oxide steel (black)

he's become one of the world's best lunar imagers and a prolific author on astrophotography

center positive