National Geographic Field Guide to the Birds of Eastern North America (9781426203305)

National Geographic Field Guide to the Birds of Eastern North America (9781426203305)New enthusiasts are flocking in record numbers to the fascinating pastime of birding. National Geographic has been meeting their need for clear and accurate information for 25 years with our million selling Field Guide to the Birds of North America. Now, to better serve the expanding market, weve customized our field guide format to offer unique coverage for birders east or west of the Rocky Mountains. These new volumes deliver in depth information on

and can be used for carrying 2" filters and connecting ASI cooled cameras to Nikon Lens

we have created an adapter to be screwed to the M110x1 thread of the ESATTO 4" draw tube to convert it into an M92x1 female thread which is the same as the one on the original Takahashi focuser

11 lbs Field Stop 6

To get started

sharp images with a magnification of 9X and a 5º apparent field of view

The focal ratio of 80PHQ is f/7

This type 1/1

The 15mm and 9mm eyepieces can be used in any telescope with a 1

If the eye is moved back and forth only slightly

Works on the EQ6 and EQ6-R mounts

5mm PL3304807 + PL3304809 + PL3304800 19 9mm M48 extension+9mm M48 extension+M48 spacer 1mm PL3304807 + PL3304809 + PL3304801 19

USB for PS