APM-Riccardi Apo-Reducer 0,75 x M63 small

APM-Riccardi Apo-Reducer 0,75 x M63 small

Our new APM-Riccardi Apo-Reducer with reducing factor 0.75 x with M63 thread on both sides.
Manufacturer : APM-Riccardi
SKU : APM-RIRED-M63-small
Price: 415.97 € excl tax
22 December 2022
Delivery date : 1-2 days (as from Availability)
Product description

Massimo Riccardi, well-known optical designer from Italy, has calculated a high-quality 3-lens 0.75x reducer / flattener for APM-LZOS apochromatic telescopes, which is also suitable for many apos from other manufacturers. The reducer reduces the focal length by a quarter and corrects the image field. Use it to transform your telescope into a fast astrograph! The connection to the telescope and the camera is made via an M63 x 1 thread. We can also offer an adjustment flange for precise adjustment if the reducer / flattener is tilted.

The back focus is adjusted depending on the telescope used. The exact value for your scope can be found in the PDF documents below. The total optical length of the reducer + back focus + focus shift is between 160mm and 180mm. For focusers with a free aperture of 68mm, the reducer can also be countersunk into the focuser with an adapter. The correction is designed up to full format and is also suitable for the widely used Kodak KAF 8300 sensor.

The necessary adapters for your telescope and your camera can be found in the PDF graphic below (RiccardiAdaption.pdf).


  • Universal Reducer/Flattener for many Apochromats
  • High quality optics, calculated by Massimo Riccardi
  • High-quality multi coatings
  • Excellent image quality up to full frame sensors


  • APM Riccardi Reducer 0.75x M63x1
Products specifications
CoatingFully multicoated
Housing materialAluminium
Lenses3 Lenses
Connection to cameraM63 x 1 ID-Thread
Focal length reduction0.75 x
Diameter67 mm
Length71.7 mm (with Dustcaps 75 mm)
Weight17.5 oz (with Dustcaps 18.9 oz)
Fully corrected field40 mm
Connection to telescopeM63 x 1 OD-Thread
Optical length without collimation flange180.05 mm
Optical length with collimation flange189.05 mm
Recommended distance from focal plane to connecting threadwatch PDF

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