This image was taken in the Duomo Catherdral in Milan Italy with available light.
Canon 70D with 10-22mm f/3.5-4.5 lens at 10mm, 1/4 sec handheld, f/20, ISO 6400. A very small f stop was used to create starbusts.
Noise reduction was done in DxO PL7 followed by adjustments of saturation, contrast, lighting, amd detail in Adobe Camera RAW. Photoshop was used for straightening, cropping, sharpening, a final contrast adjustment, and to add a vignette.