APM Riccardi focal reducer 0.75 x large with M82 thread

APM Riccardi focal reducer 0.75 x large with M82 thread. Designed for apochromatic refractors.

Massimo Riccardi, famous optical designer from Italy, designed for APM Telescopes a new 3 element 0.75 x Apo-Reducer/Flattener Corrector for apochromatic telescopes. The reducer shortens the focal length by a quarter and corrects the image circle - thereby converting your telescope into a fast astrograph!

Assembly

The connection to your telescope and camera occurs over an M82 x 1 thread. For the correct adjustment of the reducer/flatener we suggest to use an optional tip-tilt adjustment flange.

Backfocus

Usually the reducer is screwed onto the focuser. The reducer can also be installed inside the focuser barrel, if the free aperture is equal to or larger than 90 mm.

The right backfocus for your telescope you will find in the enclosed PDF chart (see below). The total optical path of reducer plus backfocus plus focus change is between about 185 mm and 210 mm.

The correction is made for chips up to 52 mm diagonal and perfect for the best known Kodak KAF 16803 chip.

You can find the correct adapter for your telescope camera combination in the enclosed PDF graphic (RiccardiAdaption.pdf).

Delivery contents

• Reducer
• 2 Dustcaps