Showing 1–24 of 60 results
Revolutionary new WO x0.72 Adjustable Reducer/Flattener made for f/6 – f/7.8 refractors. This high-quality flattener has been engineered and CNC machined for usage with William Optics’ GT153, FLT 132,
The special full-frame reducer of 61EDPH Ⅲ: One end of the thread is M68 × 1, connected to the focuser; the other end of the thread is M48 × 0.75 and has a built-in 2″ filter thread. The back focus is
Brand new adjustable flattener/reducer for the William Optics Zenithstar 73 OTA. You can set the correct spacing for your camera without the need for extension tubes.
The iOptron field flattener reduces
the normal field curvature inherent in all refractors to provide you
with images that are sharply focused out to the very corners of your
35mm or large format CC
The flattener: One end of the thread is M68 × 1, connected to the focuser; the other end of the thread is M48 × 0.75 and has a built-in 2″ filter thread. The back focus is 55mm. If it needs to be exte
ZWO Atmospheric Dispersion Corrector is used to reduce the effect of atmospheric dispersion on lunar and planetary images.
This revolutionary new William Optics Adjustable Flattener 68III is made for refractor of focal ratio f/6 – f/7.5. This high-quality flattener has been engineered and CNC machined for usage with our F
0.7x universal 3″ full-frame reducer for the Askar 107PHQ, 130PHQ, and 151PHQ astrographs. Significantly speeds up these long-focal-ratio instruments.
1x full-frame flattener for the Askar 160APO refractor. Flat stars across the entire full-frame sensor at native focal length.
0.8x full-frame reducer for the Askar 185APO refractor. 20% shorter focal length with wider field and full-frame sensor coverage.
1x full-frame flattener for the Askar 185APO refractor. Corrects field curvature at native focal length for perfectly flat stars across the sensor.
Dedicated 0.75x reducer for the Askar 60F astrograph. 25% shorter focal length for faster imaging and wider field of view.
0.75x full-frame reducer for the Askar 65PHQ. Quadruplet design reduces focal ratio to f/4.8 (312mm) for fast widefield imaging.
Dedicated 0.75x reducer for the Askar 71F astrograph. Shorter focal length with wider field — perfect for imaging larger nebulae and star fields.
0.76x full-frame reducer with triplet optics for the Askar 80PHQ. 3″ form factor, reduces to approximately f/5.7 with corrected field.
Dedicated 0.75x reducer for the Askar 91F astrograph. Faster focal ratio and wider field for capturing larger deep-sky targets.
Extreme f/3.9 full-frame reducer for the FRA400 and FRA500 astrographs. Four-element design for dramatically reduced exposure times.
Extreme f/3.9 full-frame reducer optimized for the Askar FRA600 astrograph. Four-element design for dramatically faster deep-sky exposures.
0.7x full-frame reducer for the Askar FRA400C astrograph. Significantly faster imaging with wider field and full-frame coverage.
The William Optics Dr. Flat Master is an apochromatic triplet reducer/flattener designed for 12″ – 16″ WO and GSO Ritchey-Chrétien telescopes. It reduces the focal length by 0.8x and flattens the fiel
FF65APO 0.75× Full Frame Reducer ZWO has released a brand-new FF65APO 0.75× full frame reducer with a four-element optical design. It has a reduction factor of 0.75x, which gives the FF65APO f/6.4 ast