https://www.cloudynights.com/topic/856662-askar-frp-and-phq-what-is-the-difference/FRA are faster. PHQ are slower. So the 65mm phq is slower (but longer focal length) than the 300 FRA.
The longer, slower telescopes are easier to make in terms of optical quality,
so basically the phq 65 is slower and longer and the FRA is shorter and faster.
