William Optics Fluorostar IV
Best premium refractor for dedicated deep sky astrophotography enthusiasts.
This triplet apochromatic refractor delivers exceptional color correction and sharpness, making it a versatile choice for both visual astronomy and deep-sky imaging. Its robust, precision-machined construction ensures stability, while the premium glass optics provide the clarity needed for high-resolution planetary and wide-field observations.
$4998.00
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Who it's for
- Astrophotographers seeking professional-grade color correction and crisp star detail
- Serious hobbyists who value durable equipment and smooth mechanical operation
- Night sky photographers wanting a streamlined setup and precise focusing
Who should skip it
- Mobile observers who prefer lightweight setups for quick travel
- Budget-conscious beginners looking for an affordable entry into astrophotography
- Impatient observers wanting to start imaging immediately after setting up
Performance breakdown
Optical Clarity
FPL-53 glass delivers virtually perfect color correction for crisp, high-contrast views.
Build Integrity
Precision CNC-machined aluminum ensures rock-solid stability for demanding long-exposure astrophotography.
Focuser Precision
The 3.5-inch rack-and-pinion system handles heavy imaging gear without slippage.
Versatility
A balanced aperture makes this equally capable for planetary and deep-sky imaging.
Portability
At nearly 20 pounds, it requires a sturdy mount for field use.
Accessory Ecosystem
Thoughtful inclusions like the Bahtinov mask simplify setup for serious observers.
Key Specs
Aperture
132mm
Focal Length
925mm
Focal Ratio
f/7
Optical Design
Triplet Apochromatic
Optical Coatings
Fully Multi-Coated
Focuser Type
Rack and Pinion
Focuser Size
3.5 inches
Optical Tube Material
Aluminum
Total Weight
19.8 lbs
Highest Useful Magnification
256x
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