What does the Askar 0.7x reducer do to the focal length of the Askar 130PHQ?
The Askar 130PHQ has a native focal length of 1000mm at f/7.7. The 0.7x reducer will shorten its focal length to 700mm and change the focal ratio to a much faster f/5.4, allowing for wider fields of view and significantly shorter exposure times.
Is the Askar 0.7x reducer compatible with full-frame cameras?
Yes. It is designed to produce a corrected 44mm image circle, which is large enough to fully illuminate a standard full-frame sensor (36x24mm) without significant vignetting, providing sharp stars across the entire frame.
How do I connect my camera to the Askar 0.7x Universal Reducer?
The reducer is designed for a standard 55mm backfocus from its rearmost flange. It includes M68, M54, and M48 adapters, allowing you to directly connect most dedicated astronomy cameras, DSLRs (with a standard 44mm T-ring), and filter wheels using common extension tubes.
Will this reducer introduce chromatic aberration to my Askar 107PHQ?
No. The reducer features a 3-element optical design that includes one ED (Extra-low Dispersion) glass element. This design actively corrects for chromatic aberration, ensuring that the excellent color fidelity of the 107PHQ's quadruplet objective is maintained.
How does the Askar 0.7x reducer help when imaging large targets like the North American Nebula (NGC 7000)?
On a telescope like the Askar 151PHQ (1057mm focal length), the native field of view is too narrow to frame the entire North American Nebula. By reducing the focal length to approximately 740mm, the 0.7x reducer expands the field of view, allowing you to capture the entire nebula and the adjacent Pelican Nebula (IC 5070) in a single shot with a full-frame camera.
Can I use the Askar 0.7x reducer for visual observing?
This accessory is designed and optically corrected specifically for astrophotography. While you might be able to reach focus with some long-focal-length eyepieces, it is not optimized for visual use and will likely result in suboptimal views. Its primary purpose is to create a flat, corrected field for a camera sensor.
