Flattener / Reducer / Correctors

New ! Adjustable Flat61 for William Optics ZS61 II Telescopes

• Compensates for field curvature and enables sharp images at the edges
• Camera can be mounted directly with M48 camera adapter
• Suitable for refractors from f/5 to f/7
• Distance to chip plane is variably adjustable

Perfect astrophotography: Whether you are an experienced astrophotographer or an enthusiastic beginner - with this Reducer Flattener you can take impressive pictures with ease.

A valuable addition for the large refractors from William Optics

• Image correction right to the edge
• Reduction factor 0.72x
• M92 threaded connection to the telescope
• Universal connection with M48 to camera or filter wheels etc.
• Very high quality workmanship

This Reducer Flattener is designed to take the optical performance of your telescope to a new level. With a reduction factor of X0.8 and an outstanding flattener function, it minimizes distortions and aberrations that can occur during observation and photography.

The 0.8x Flattener corrector from William Optics is optimized for full-frame format and suitable for all apos from 102mm aperture with large extensions.

• Connection thread on the telescope side M92x1 - adapters to M68 or M54 are optionally available
• The distance is precisely adjustable, so the corrector can be individually
• optimized to the refractor for best possible stars
• Triplet design with Ohara glass (Japan)
• M48x0.75 camera mount with possibility to screw in 2" filter

The corrector from Skywatcher reduces the focal length of the Evostar-100EDX and Esprit-70EDX and improves the image in the field.

• Suitable for Skywatcher Evostar-100EDX and Esprit-70EDX
• Shortening factor 0.92x
• Is screwed to the focuser
• Connection at the camera side - M48x0.75 male thread
• Working distance - 55 mm

Focal length reducer for VSD90ss and VSD70ss with two ED lenses for high-end astrophotography and an illumination of 44 mm for full-frame cameras

• Elaborately designed focal length reducer for the VSD90ss/VSD70ss
• Suitable for a 24x36 full format camera
• Four lens elements in four groups for exceptionally sharp star images
• Guarantees a large illumination of the image field up to 44 mm
• Very sharp stars up to the edge of the field of view
• The VSD90ss thus allows extremely short exposure times
• High-quality standard ‘Made in Japan’
• Reduces the focal ratio of the VSD90ss from f5.5 to f3.9
• Dimensions: 92 mm diameter x 59.2 mm length / Weight: 589 g

The Svbony SV193 combines two essential functions for ambitious astrophotographers: focal length reduction and field flattening. With a reduction factor of 0.8, it shortens the effective focal length of the SV503 80mm f/7 from 560 mm to approximately 448 mm, enabling a wider field of view and shorter exposure times—ideal for deep-sky imaging.

Technical Features

• Optical design: 3 elements in 3 groups, fully multi-coated for high light transmission and minimized reflections
• Connection: 2″ barrel with M54x0.75 thread for cameras; compatible with full-frame sensors
• Filter thread: Standard 2″ thread for integrating light pollution filters
• Housing: Hard-anodized aluminum, lightweight and durable
• Field flattening: Corrects spherical aberration and edge distortion for sharp star images across the entire field