This photo is a good comparison to my previous one of Clavius, showing the difference between a 102mm fluorite refractor and a 127mm achromatic refractor. The quality of this 102mm f9 Vixen fluorite is amazing. Visually I was able to take it to 552x without image degradation. This photo was taken with 25mm plossl and 3x barlow, for a total of 110x, plus 4x optical zoom on my Canon G3.