No spherical or chromatic aberration.
Focal ratio: F/5.7
Equally useful for Astronomy in addition to wildlife/birding, landscapes, cityscapes, harborscapes etc.
Price: $1,000 for the ota plus $250 for eyepiece: $1,250 total and is
a 20% discount from my original cost.
Available: Bogen 3178 "Wilderness" tripod and Scopepack/w carrystraps.