Askar 0.76x Reducer for 80PHQ

The Askar 0.76x Reducer converts your Askar 80PHQ from its native f/7.5 focal ratio to a faster f/5.7. This shortens your exposure times and provides a wider field of view with a new focal length of 456mm, making it better suited for capturing large deep-sky objects.

Yes. The 44mm image circle is specifically designed to be larger than the diagonal of a standard full-frame sensor (which is approximately 43.3mm). This ensures your full-frame camera sensor is fully illuminated without vignetting caused by the reducer.

The reducer provides a standard 55mm backfocus from its rearmost thread. This is the standard spacing for most cooled astronomy cameras when used with a filter wheel, or for a DSLR/mirrorless camera with its corresponding M48 T-ring. You simply add the necessary M48 spacers to achieve the 55mm distance to your camera's sensor.

The Andromeda Galaxy (M31) is a very large target that benefits from the wider 456mm focal length. More importantly, the faster f/5.7 optics gather light more quickly than the native f/7.5, allowing you to capture the faint outer arms and dust lanes of the galaxy with shorter individual exposures, improving your overall signal-to-noise ratio in a single imaging session.

Yes. The reducer has a built-in M48x0.75 (2-inch) filter thread on the camera side, allowing you to easily screw in standard 2-inch mounted filters for light pollution reduction or narrowband imaging.

No, this reducer is specifically designed and optically matched to work with the Askar 80PHQ astrograph. Using it on other telescopes will likely result in poor optical correction, field curvature, and an inability to reach focus.