This is an image of M13 taken with the one-meter. There are five 30-second images. Calibration and deconvolution using PixInsight. Raw data had a FWHM just a little above one arcsecond; deconvolution takes that down to about half an arcsecond. Click the image to see it full size (2048×2048 pixels).
The white triangle at bottom right was from a misalignment of the filter wheel, which has since been corrected.
Deconvolution is a mathematical process that uses a ‘map’ of the star images (a point spread function, or PSF) to remove blurring factors and obtain a sharper image.