Askar SQA85 85mm f/4.8 Quintuplet Astrograph | Dark Clear Skies Wireless Pager System Globular Cluster M5

Globular Cluster M5

which has a same focal ratio but a slightly smaller aperture

Sensor size: 1/2

With an 80mm aperture and a 480mm focal length at an f/6 ratio

The question which full-width-half-maximum (FWHM) is the "best" comes up very often

Askar SQA85 85mm f/4.8 Quintuplet Astrograph | Dark Clear Skies Wireless Pager System Globular Cluster M5Askar SQA85 85mm f 4. 8 Quintuplet Astrograph Refractor Telescope The Askar SQA85 85mm f 4. 8 Quintuplet Astrograph is a high performance 85mm quintuplet Petzval APO refractor telescope, designed for serious astrophotographers seeking exceptional clarity and detail. With a fast focal ratio of f 4. 8, this telescope delivers sharp, high contrast images, even across a full frame sensor, making it ideal for capturing breath taking views of deep sky