Astronomy Specialist

FLUOROSTAR 91 F/5.9 APO TRIPLET

$3,299.00

Color
Gold
Red
Quantity
- +

 

The new William Optics Fluorostar FLT 91 is a three element air-spaced apochromatic refractor with a focal ratio of f/5.9 and a focal length of 540mm. Utilizing FPL-53 synthetic fluorite glass with STM coatings, this telescope provides excellent aberration correction and amazing optical performance.

The 3.3" dual speed rack & pinion focuser is smooth, stable and reliable, providing no slippage over long imaging sessions. The super smooth field rotator includes markings for every degree, and a solid thumbscrew position lock.

The CNC-machined and anodized handle bar with Vixen-style saddle is perfect for attaching a guide scope or other accessories. The FLT 91 also includes William Optics' innovative clear Bahtinov mask integrated into the lens cap. The Rotolock 2 inch adapter provides for a solid and efficient connection for a William Optics 2 inch diagonal, and other accessories.

William Optics uses high quality steel lens cells for their Gran Turismo and FLT triplet refractors. This is perfect for temperature compensation and will prevent pinched optics in cold weather conditions.

For best imaging results, it is recommended to pair the FLT 91 with its matching Flat6AIII 0.8x field flattener/reducer (with M92 adapter ring) or Flat68AIII 1.0x flattener.


 

Optical design

Air-spaced apochromatic triplet

Objective diameter

91 mm

Focal length

540 mm

Focal ratio

f/5.9

Image circle

44.4 mm (with Flat6AIII field flattener)

Compatible flattener

William Optics Flat6AIII

Mount attachment

290 mm Vixen-style dovetail bar

Focuser

Rack & pinion dual speed 3.3" diameter

Camera connection

M92 x 1, 2" Rotolock

Backfocus

TBA

Tube weight

4.165 kg (5.575 kg with accessories)

Tube length

441 mm (fully retracted), 510 mm (fully extended)

Tube diameter

TBA

Dew shield diameter

TBA

SKU

WO-T-FLT-91GD-RP33 (Gold), WO-T-FLT-91RD-RP33 (Red)

 


 

  • Fluorostar 91
  • Lens cap with Bahtinov mask
  • Vixen-style saddle handle bar
  • 290 mm Vixen-style dovetail bar
  • Visual extension tube
  • Soft carry case

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