Telescope-Accessories-William Optics Ultra Flat 0.79x Reducer for FLT91

Fluorostar 91 Ultra Flat—The 0.79x FLT91 Full-Frame Corrector!

Featuring impressive FPL-53 glass, William Optics’ Fluorostar series is a
standout in the triplet refractor market. The Ultra Flat 0.79x Reducer for
FLT91 takes this premium scope to new heights, with faster and flatter images
for full-frame imagers. Experience the ultimate in FLT91 imaging today!

With a 540 mm focal length, 91 mm f/5.9, optics the William Optics Fluorostar
91 Triplet APO Refractor can just frame large objects such as the Orion nebula
or Andromeda galaxy when used in conjunction with a full-frame camera. With
this flattener however you can now more comfortably frame these large
celestial objects (or help squeeze more into the view of smaller sensor
cameras) and capture more expansive astro-vistas than before. Design
specifically for the Fluorostar 91, this 0.79x reducer integrates seamlessly
with the telescope and provides a M54x0.75 mount point connecting your
camera and supporting large full-frame imaging train accessories.

Dedicated William Optics Fluorostar 91 Astrophotography Upgrade

Owners of the excellent
William Optics Fluorostar 91 FPL53 Triplet APO Refractor with 3.3″ Rack &
Pinion Focuser
looking to optimize the premium FPL-53 optics for astrophotography and gain a
wider perspective need look no further than this full-frame flattening
reducer! Still need your scope? Grab the FLT91 and this flattener in a handy gray or gold bundle!

Augmenting Ultimate APO Optics
With a 0.79x reduction
factor, this flattening reducer takes the 540 mm focal length of the FLT91
to about 424 mm offering a notable increase to your field of view. This
additionally lowers the focal ratio from f/5.9 to f/4.7 for brighter images,
making data acquisition faster and easier. This is achieved with one group of
four elements, which concentrate this flattened, wider, and brighter view
over a 43.2mm image circle—covering camera sensors all the way up to
full-frame!

Please Note: This reducer is designed for
56.18 mm of backfocus