M4 Globular cluster

Globular cluster in Scorpius
RA: 16h 22m
DEC: -26º 27´
Mag: 6.4

Scope/lens: 200mm f/4 reflector
Mount: GM 11
Guiding: ST-4 autoguider
Guidescope: 80mm refractor (400mm-f/5)

Film: Fuji Color 800
Exposure: 7 minutes

Location: Camino Cielo Rd., Santa Barbara County , CA (backyard)
Date: 7/22/2000

A re-shoot of M4 from my initial attempt in June, 1999. What a difference one year of experience makes. A larger scope (8 inch vs. 6 inch) and larger aperture (f/4 vs. f/5) seem to figure in the equation. However, moving to a heavier mount, the Losmandy GM 11 also made a difference. My initial attempt can be seen here.

Why a seven minute exposure? High clouds and haze from a nearby forest fire cut short my observation session.

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